add aoc 2022

45 files changed, 11883 insertions, 0 deletions

diff --git a/advent-of-code/2022/.gitignore b/advent-of-code/2022/.gitignore
new file mode 100644
index 0000000..15a9e6c
--- /dev/null
+++ b/advent-of-code/2022/.gitignore
@@ -0,0 +1,2 @@
+*.out
+*.swp
diff --git a/advent-of-code/2022/01/1.c b/advent-of-code/2022/01/1.c
new file mode 100644
index 0000000..8886515
--- /dev/null
+++ b/advent-of-code/2022/01/1.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define BUFSZ 1024
+
+char buf[BUFSZ];
+
+int main() {
+    int maxval = 0;
+    int cur = 0;
+    FILE* fp = fopen("input", "r");
+    while (fgets(buf, BUFSZ, fp)) {
+        int len = strlen(buf);
+        char *end;
+        if (len <= 1) {
+            maxval = cur > maxval ? cur : maxval;
+            cur = 0;
+        } else {
+            cur += strtol(buf, &end, 10);
+        }
+    }
+    printf("%d\n", maxval);
+    return 0;
+}
diff --git a/advent-of-code/2022/01/2.c b/advent-of-code/2022/01/2.c
new file mode 100644
index 0000000..1ab897f
--- /dev/null
+++ b/advent-of-code/2022/01/2.c
@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define BUFSZ 1024
+
+char buf[BUFSZ];
+
+int maxheap[3] = {0, 0, 0};
+
+void push(int val) {
+    int minidx = 0;
+    for (int i = 0; i < 3; i++) {
+        if (maxheap[i] < maxheap[minidx]) {
+            minidx = i;
+        }
+    }
+    if (maxheap[minidx] < val) {
+        maxheap[minidx] = val;
+    }
+}
+
+int main() {
+    int maxval = 0;
+    int cur = 0;
+    FILE* fp = fopen("input", "r");
+    while (fgets(buf, BUFSZ, fp)) {
+        int len = strlen(buf);
+        char *end;
+        if (len <= 1) {
+            maxval = cur > maxval ? cur : maxval;
+            push(cur);
+            cur = 0;
+        } else {
+            cur += strtol(buf, &end, 10);
+        }
+    }
+    printf("%d\n", maxheap[0] + maxheap[1] + maxheap[2]);
+    return 0;
+}
+
diff --git a/advent-of-code/2022/01/input b/advent-of-code/2022/01/input
new file mode 100644
index 0000000..dd526c0
--- /dev/null
+++ b/advent-of-code/2022/01/input
@@ -0,0 +1,2252 @@
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diff --git a/advent-of-code/2022/02/1.c b/advent-of-code/2022/02/1.c
new file mode 100644
index 0000000..a699612
--- /dev/null
+++ b/advent-of-code/2022/02/1.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define BUFSZ 1024
+
+char buf[BUFSZ];
+int valuetbl[3] = {1, 2, 3};
+int wintbl[3][3] = {
+    {3, 6, 0},
+    {0, 3, 6},
+    {6, 0, 3}
+};
+
+
+int score(char a, char b) {
+    return valuetbl[b - 'X'] + wintbl[a - 'A'][b - 'X'];
+}
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    if (fp == NULL) return -1;
+    int scr = 0;
+    while (fgets(buf, BUFSZ, fp)) {
+        if (strlen(buf) <= 1) continue;
+        scr += score(buf[0], buf[2]);
+    }
+    printf("%d\n", scr);
+    return 0;
+}
diff --git a/advent-of-code/2022/02/2.c b/advent-of-code/2022/02/2.c
new file mode 100644
index 0000000..5ec98ec
--- /dev/null
+++ b/advent-of-code/2022/02/2.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define BUFSZ 1024
+
+char buf[BUFSZ];
+int valuetbl[3] = {1, 2, 3};
+int wintbl[3][3] = {
+    {3, 6, 0},
+    {0, 3, 6},
+    {6, 0, 3}
+};
+char decodetbl[3][3] = {
+    {'C', 'A', 'B'},
+    {'A', 'B', 'C'},
+    {'B', 'C', 'A'}
+};
+
+
+int score(char a, char b) {
+    b = decodetbl[a - 'A'][b - 'X'];
+    return valuetbl[b - 'A'] + wintbl[a - 'A'][b - 'A'];
+}
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    if (fp == NULL) return -1;
+    int scr = 0;
+    while (fgets(buf, BUFSZ, fp)) {
+        if (strlen(buf) <= 1) continue;
+        scr += score(buf[0], buf[2]);
+    }
+    printf("%d\n", scr);
+    return 0;
+}
diff --git a/advent-of-code/2022/02/input b/advent-of-code/2022/02/input
new file mode 100644
index 0000000..132a692
--- /dev/null
+++ b/advent-of-code/2022/02/input
@@ -0,0 +1,2501 @@
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+
diff --git a/advent-of-code/2022/03/1.c b/advent-of-code/2022/03/1.c
new file mode 100644
index 0000000..447fb78
--- /dev/null
+++ b/advent-of-code/2022/03/1.c
@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#define BUFSZ 1024
+
+char buf[BUFSZ + 1] = {0};
+
+int table[53] = {0};
+
+int decode(char c) {
+    if (c >= 'A' && c <= 'Z') {
+        return 26 + c - 'A' + 1;
+    }
+    if (c >='a' && c <= 'z') {
+        return c - 'a' + 1;
+    }
+    return -1;
+}
+
+int findcommon(char *buf, int len) {
+    memset(table, 0, 53 * sizeof(int));
+    len = len / 2;
+    for (int i = 0; i < len; i++) {
+        int code = decode(buf[i]);
+        if (table[code] == 0) {
+            table[code] = 1;
+        }
+    }
+    for (int i = 0; i < len; i++) {
+        int code = decode(buf[i + len]);
+        if (table[code] == 1) return code;
+    }
+    return 0;
+}
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    int sum = 0;
+    if (fp == NULL) return -1;
+    while (fgets(buf, BUFSZ, fp)) {
+        if (strlen(buf) <= 1) continue;
+        int len = strlen(buf) - 1;
+        assert((len % 2 == 0) && "len error");
+        int common = findcommon(buf, len);
+        sum += common;
+    }
+    printf("%d\n", sum);
+}
diff --git a/advent-of-code/2022/03/2.c b/advent-of-code/2022/03/2.c
new file mode 100644
index 0000000..f91ea46
--- /dev/null
+++ b/advent-of-code/2022/03/2.c
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#define BUFSZ 1024
+
+char buf[BUFSZ + 1] = {0};
+
+int table[53] = {0};
+
+int decode(char c) {
+    if (c >= 'A' && c <= 'Z') {
+        return 26 + c - 'A' + 1;
+    }
+    if (c >='a' && c <= 'z') {
+        return c - 'a' + 1;
+    }
+    return -1;
+}
+
+int process(char *buf, int len, int n) {
+    if (n == 1) memset(table, 0, 53 * sizeof(int));
+    for (int i = 0; i < len; i++) {
+        int code = decode(buf[i]);
+        if (table[code] == n - 1) {
+            if (n == 3) return code; 
+            table[code] = n;
+        }
+    }
+    return 0;
+}
+
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    int sum = 0;
+    if (fp == NULL) return -1;
+    int line = 0;
+    while (fgets(buf, BUFSZ, fp)) {
+        if (strlen(buf) <= 1) continue;
+        int len = strlen(buf) - 1;
+        sum += process(buf, len, line % 3 + 1);
+        line++;
+    }
+    printf("%d\n", sum);
+}
diff --git a/advent-of-code/2022/03/input b/advent-of-code/2022/03/input
new file mode 100644
index 0000000..167796a
--- /dev/null
+++ b/advent-of-code/2022/03/input
@@ -0,0 +1,301 @@
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+
diff --git a/advent-of-code/2022/04/1.c b/advent-of-code/2022/04/1.c
new file mode 100644
index 0000000..3999003
--- /dev/null
+++ b/advent-of-code/2022/04/1.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    int x1, x2, y1, y2;
+    int count = 0;
+    while (fscanf(fp, "%d-%d,%d-%d", &x1, &x2, &y1, &y2) != EOF) {
+        if (x1 <= y1 && x2 >= y2 || x1 >= y1 && x2 <= y2) {
+            count++;
+        }
+    }
+    printf("%d\n", count);
+    return 0;
+}
diff --git a/advent-of-code/2022/04/2.c b/advent-of-code/2022/04/2.c
new file mode 100644
index 0000000..5d30d1c
--- /dev/null
+++ b/advent-of-code/2022/04/2.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    int x1, x2, y1, y2;
+    int count = 0;
+    while (fscanf(fp, "%d-%d,%d-%d", &x1, &x2, &y1, &y2) != EOF) {
+        if (x1 >= y1 && x1 <= y2 || x2 >= y1 && x2 <= y2 || x1 <= y1 && x2 >= y2) {
+            count++;
+        }
+    }
+    printf("%d\n", count);
+    return 0;
+}
diff --git a/advent-of-code/2022/04/input b/advent-of-code/2022/04/input
new file mode 100644
index 0000000..4cfdc23
--- /dev/null
+++ b/advent-of-code/2022/04/input
@@ -0,0 +1,1000 @@
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diff --git a/advent-of-code/2022/05/1.c b/advent-of-code/2022/05/1.c
new file mode 100644
index 0000000..bef5431
--- /dev/null
+++ b/advent-of-code/2022/05/1.c
@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+struct listnode {
+    struct listnode *next;
+    char val;
+};
+typedef struct {
+    struct listnode *head;
+} Stack;
+
+void stack_push(Stack *s, char val) {
+    struct listnode *n = malloc(sizeof(struct listnode));
+    n->next = s->head;
+    n->val = val;
+    s->head = n;
+}
+
+char* stack_top(Stack *s) {
+    if (s->head == NULL) return NULL;
+    return &(s->head->val);
+}
+
+void stack_pop(Stack *s) {
+    if (s->head == NULL) return;
+    struct listnode *next = s->head->next;
+    free(s->head);
+    s->head = next;
+}
+
+char buf[4096];
+
+int main() {
+    Stack s[9];
+    FILE *fp = fopen("input", "r");
+    fread(buf, 1, 36 * 8, fp);
+    for (int i = 0; i < 9; i++) {
+        for (int j = 0; j < 8; j++) {
+            char c = buf[(7 - j) * 36 + i * 4 + 1];
+            if (c != ' ') {
+                stack_push(&s[i], c);
+            }
+        }
+    }
+    fgets(buf, 4096, fp);
+    fgets(buf, 4096, fp);
+    int amount, from, to;
+    while (fscanf(fp, "move %d from %d to %d\n", &amount, &from, &to) > 0) {
+        for (int i = 0; i < amount; i++) {
+            char c = *stack_top(&s[from - 1]);
+            stack_pop(&s[from - 1]);
+            stack_push(&s[to - 1], c);
+        }
+    }
+    for (int i = 0; i < 9; i++) {
+        printf("%c", *stack_top(&s[i]));
+    }
+    printf("\n");
+    return 0;
+}
diff --git a/advent-of-code/2022/05/2.c b/advent-of-code/2022/05/2.c
new file mode 100644
index 0000000..8a3215d
--- /dev/null
+++ b/advent-of-code/2022/05/2.c
@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+struct listnode {
+    struct listnode *next;
+    char val;
+};
+typedef struct {
+    struct listnode *head;
+} Stack;
+
+void stack_push(Stack *s, char val) {
+    struct listnode *n = malloc(sizeof(struct listnode));
+    n->next = s->head;
+    n->val = val;
+    s->head = n;
+}
+
+char* stack_top(Stack *s) {
+    if (s->head == NULL) return NULL;
+    return &(s->head->val);
+}
+
+void stack_pop(Stack *s) {
+    if (s->head == NULL) return;
+    struct listnode *next = s->head->next;
+    free(s->head);
+    s->head = next;
+}
+
+char buf[4096];
+
+int main() {
+    Stack s[9];
+    FILE *fp = fopen("input", "r");
+    fread(buf, 1, 36 * 8, fp);
+    for (int i = 0; i < 9; i++) {
+        for (int j = 0; j < 8; j++) {
+            char c = buf[(7 - j) * 36 + i * 4 + 1];
+            if (c != ' ') {
+                stack_push(&s[i], c);
+            }
+        }
+    }
+    fgets(buf, 4096, fp);
+    fgets(buf, 4096, fp);
+    int amount, from, to;
+    while (fscanf(fp, "move %d from %d to %d\n", &amount, &from, &to) > 0) {
+        for (int i = 0; i < amount; i++) {
+            char c = *stack_top(&s[from - 1]);
+            stack_pop(&s[from - 1]);
+            buf[i] = c;
+        }
+        for (int i = 0; i < amount; i++) {
+            int n = amount - i - 1;
+            stack_push(&s[to-1], buf[n]);
+        }
+    }
+    for (int i = 0; i < 9; i++) {
+        printf("%c", *stack_top(&s[i]));
+    }
+    printf("\n");
+    return 0;
+}
diff --git a/advent-of-code/2022/05/input b/advent-of-code/2022/05/input
new file mode 100644
index 0000000..d4cd60a
--- /dev/null
+++ b/advent-of-code/2022/05/input
@@ -0,0 +1,513 @@
+                [B] [L]     [J]    
+            [B] [Q] [R]     [D] [T]
+            [G] [H] [H] [M] [N] [F]
+        [J] [N] [D] [F] [J] [H] [B]
+    [Q] [F] [W] [S] [V] [N] [F] [N]
+[W] [N] [H] [M] [L] [B] [R] [T] [Q]
+[L] [T] [C] [R] [R] [J] [W] [Z] [L]
+[S] [J] [S] [T] [T] [M] [D] [B] [H]
+ 1   2   3   4   5   6   7   8   9 
+
+move 5 from 4 to 5
+move 2 from 5 to 8
+move 2 from 9 to 1
+move 2 from 9 to 1
+move 1 from 5 to 3
+move 10 from 5 to 8
+move 1 from 4 to 7
+move 1 from 1 to 2
+move 5 from 3 to 7
+move 1 from 2 to 8
+move 21 from 8 to 5
+move 13 from 5 to 7
+move 2 from 9 to 4
+move 1 from 7 to 4
+move 5 from 1 to 4
+move 1 from 5 to 7
+move 2 from 2 to 7
+move 1 from 3 to 2
+move 1 from 1 to 6
+move 7 from 5 to 9
+move 16 from 7 to 4
+move 7 from 9 to 3
+move 1 from 7 to 5
+move 1 from 3 to 8
+move 3 from 2 to 7
+move 1 from 8 to 9
+move 3 from 3 to 6
+move 21 from 4 to 9
+move 1 from 5 to 7
+move 4 from 4 to 9
+move 8 from 6 to 3
+move 6 from 7 to 1
+move 12 from 9 to 8
+move 6 from 7 to 2
+move 3 from 6 to 5
+move 1 from 6 to 9
+move 4 from 8 to 6
+move 3 from 8 to 5
+move 4 from 1 to 8
+move 4 from 6 to 1
+move 2 from 1 to 3
+move 1 from 5 to 8
+move 2 from 2 to 8
+move 5 from 8 to 3
+move 4 from 2 to 7
+move 5 from 8 to 1
+move 2 from 1 to 7
+move 1 from 8 to 2
+move 2 from 1 to 7
+move 11 from 9 to 2
+move 1 from 8 to 5
+move 2 from 9 to 4
+move 3 from 9 to 5
+move 2 from 5 to 1
+move 6 from 5 to 8
+move 2 from 4 to 2
+move 1 from 5 to 6
+move 7 from 1 to 8
+move 2 from 2 to 7
+move 13 from 8 to 1
+move 16 from 3 to 1
+move 3 from 2 to 1
+move 12 from 7 to 6
+move 15 from 1 to 8
+move 2 from 3 to 8
+move 16 from 1 to 2
+move 24 from 2 to 8
+move 1 from 1 to 5
+move 1 from 5 to 8
+move 3 from 6 to 7
+move 26 from 8 to 3
+move 20 from 3 to 9
+move 1 from 2 to 9
+move 16 from 9 to 3
+move 14 from 3 to 1
+move 13 from 1 to 6
+move 3 from 3 to 4
+move 3 from 9 to 4
+move 1 from 7 to 8
+move 5 from 8 to 2
+move 8 from 8 to 5
+move 18 from 6 to 1
+move 4 from 8 to 5
+move 6 from 4 to 1
+move 2 from 2 to 5
+move 5 from 3 to 8
+move 5 from 8 to 7
+move 2 from 5 to 8
+move 5 from 5 to 4
+move 3 from 2 to 8
+move 22 from 1 to 2
+move 1 from 1 to 2
+move 5 from 8 to 2
+move 2 from 5 to 2
+move 1 from 1 to 6
+move 5 from 5 to 2
+move 1 from 9 to 8
+move 5 from 4 to 1
+move 6 from 6 to 9
+move 3 from 1 to 9
+move 1 from 1 to 7
+move 8 from 9 to 6
+move 6 from 7 to 1
+move 5 from 6 to 5
+move 27 from 2 to 1
+move 4 from 5 to 7
+move 9 from 1 to 5
+move 1 from 9 to 1
+move 3 from 6 to 2
+move 9 from 2 to 1
+move 2 from 7 to 2
+move 1 from 8 to 7
+move 10 from 5 to 9
+move 1 from 9 to 7
+move 25 from 1 to 8
+move 6 from 7 to 4
+move 11 from 1 to 7
+move 3 from 8 to 1
+move 3 from 2 to 6
+move 3 from 8 to 9
+move 11 from 8 to 6
+move 1 from 2 to 6
+move 12 from 6 to 4
+move 13 from 4 to 5
+move 1 from 6 to 1
+move 3 from 7 to 5
+move 5 from 8 to 7
+move 1 from 7 to 1
+move 5 from 1 to 6
+move 3 from 6 to 4
+move 3 from 8 to 6
+move 2 from 5 to 2
+move 12 from 5 to 9
+move 5 from 6 to 2
+move 2 from 5 to 9
+move 6 from 4 to 9
+move 11 from 7 to 3
+move 1 from 2 to 5
+move 1 from 7 to 8
+move 1 from 5 to 7
+move 1 from 7 to 1
+move 1 from 8 to 1
+move 2 from 4 to 7
+move 2 from 6 to 8
+move 5 from 3 to 6
+move 2 from 7 to 2
+move 2 from 2 to 9
+move 1 from 2 to 9
+move 1 from 1 to 6
+move 35 from 9 to 7
+move 2 from 8 to 7
+move 3 from 3 to 8
+move 5 from 2 to 4
+move 3 from 3 to 7
+move 2 from 4 to 7
+move 4 from 6 to 5
+move 4 from 5 to 9
+move 3 from 4 to 5
+move 1 from 8 to 3
+move 4 from 9 to 8
+move 1 from 9 to 6
+move 38 from 7 to 2
+move 1 from 3 to 5
+move 1 from 1 to 7
+move 4 from 7 to 3
+move 3 from 6 to 1
+move 22 from 2 to 7
+move 1 from 5 to 8
+move 7 from 8 to 4
+move 8 from 2 to 8
+move 3 from 5 to 1
+move 4 from 3 to 9
+move 1 from 8 to 3
+move 1 from 3 to 7
+move 2 from 2 to 3
+move 5 from 8 to 9
+move 3 from 9 to 1
+move 2 from 1 to 7
+move 6 from 2 to 3
+move 6 from 3 to 1
+move 2 from 3 to 6
+move 1 from 6 to 1
+move 14 from 7 to 2
+move 4 from 1 to 6
+move 8 from 1 to 3
+move 4 from 3 to 6
+move 3 from 9 to 5
+move 1 from 8 to 6
+move 1 from 8 to 4
+move 9 from 7 to 1
+move 8 from 2 to 4
+move 4 from 2 to 9
+move 2 from 2 to 1
+move 3 from 5 to 8
+move 1 from 8 to 6
+move 1 from 7 to 8
+move 1 from 6 to 5
+move 3 from 9 to 5
+move 2 from 9 to 5
+move 4 from 3 to 9
+move 3 from 6 to 3
+move 3 from 6 to 9
+move 9 from 4 to 1
+move 1 from 9 to 8
+move 3 from 3 to 6
+move 2 from 7 to 4
+move 4 from 8 to 5
+move 7 from 5 to 6
+move 19 from 1 to 9
+move 5 from 9 to 3
+move 2 from 1 to 6
+move 1 from 4 to 6
+move 4 from 3 to 2
+move 21 from 9 to 7
+move 1 from 1 to 2
+move 1 from 9 to 1
+move 1 from 1 to 8
+move 16 from 7 to 6
+move 24 from 6 to 5
+move 7 from 4 to 5
+move 1 from 8 to 3
+move 2 from 2 to 8
+move 31 from 5 to 8
+move 1 from 4 to 6
+move 2 from 6 to 9
+move 1 from 7 to 4
+move 3 from 7 to 9
+move 1 from 4 to 8
+move 2 from 3 to 5
+move 1 from 2 to 3
+move 1 from 3 to 7
+move 1 from 7 to 9
+move 24 from 8 to 6
+move 1 from 8 to 1
+move 30 from 6 to 1
+move 2 from 5 to 2
+move 1 from 6 to 9
+move 6 from 9 to 7
+move 1 from 6 to 4
+move 1 from 4 to 6
+move 23 from 1 to 3
+move 21 from 3 to 4
+move 4 from 2 to 6
+move 3 from 6 to 1
+move 1 from 5 to 1
+move 4 from 1 to 9
+move 3 from 9 to 6
+move 8 from 1 to 6
+move 4 from 8 to 5
+move 2 from 7 to 5
+move 7 from 4 to 3
+move 3 from 4 to 9
+move 9 from 3 to 9
+move 1 from 7 to 6
+move 6 from 5 to 8
+move 14 from 6 to 2
+move 4 from 8 to 4
+move 7 from 4 to 5
+move 1 from 7 to 9
+move 6 from 4 to 3
+move 13 from 2 to 6
+move 5 from 3 to 7
+move 1 from 3 to 8
+move 1 from 8 to 2
+move 4 from 8 to 3
+move 6 from 6 to 4
+move 2 from 2 to 8
+move 5 from 4 to 7
+move 3 from 7 to 5
+move 1 from 7 to 9
+move 2 from 3 to 9
+move 3 from 7 to 3
+move 1 from 7 to 9
+move 1 from 7 to 9
+move 3 from 4 to 1
+move 6 from 6 to 1
+move 2 from 7 to 5
+move 1 from 3 to 5
+move 11 from 9 to 4
+move 9 from 4 to 5
+move 3 from 3 to 4
+move 1 from 3 to 9
+move 2 from 8 to 1
+move 9 from 1 to 8
+move 22 from 5 to 8
+move 2 from 1 to 3
+move 3 from 4 to 6
+move 14 from 8 to 9
+move 1 from 3 to 9
+move 19 from 9 to 3
+move 3 from 9 to 4
+move 2 from 7 to 2
+move 1 from 4 to 6
+move 1 from 3 to 8
+move 8 from 3 to 1
+move 2 from 9 to 6
+move 1 from 2 to 5
+move 3 from 4 to 9
+move 1 from 2 to 3
+move 20 from 8 to 3
+move 4 from 9 to 5
+move 1 from 4 to 2
+move 26 from 3 to 5
+move 1 from 8 to 3
+move 8 from 1 to 4
+move 1 from 3 to 7
+move 1 from 2 to 1
+move 1 from 1 to 6
+move 1 from 6 to 7
+move 4 from 5 to 3
+move 3 from 4 to 2
+move 5 from 5 to 3
+move 2 from 2 to 6
+move 3 from 3 to 5
+move 2 from 4 to 8
+move 5 from 3 to 9
+move 5 from 9 to 8
+move 19 from 5 to 9
+move 1 from 5 to 2
+move 2 from 7 to 1
+move 1 from 1 to 7
+move 1 from 7 to 4
+move 13 from 9 to 3
+move 8 from 6 to 2
+move 10 from 3 to 5
+move 14 from 5 to 4
+move 7 from 8 to 4
+move 1 from 6 to 2
+move 6 from 3 to 8
+move 4 from 9 to 7
+move 2 from 9 to 8
+move 1 from 7 to 1
+move 3 from 2 to 7
+move 1 from 5 to 3
+move 7 from 8 to 6
+move 5 from 6 to 2
+move 8 from 4 to 5
+move 3 from 5 to 8
+move 3 from 8 to 6
+move 5 from 7 to 9
+move 5 from 3 to 6
+move 1 from 9 to 4
+move 17 from 4 to 7
+move 1 from 8 to 1
+move 12 from 7 to 8
+move 3 from 1 to 4
+move 2 from 4 to 6
+move 8 from 6 to 1
+move 4 from 6 to 3
+move 1 from 7 to 8
+move 5 from 5 to 8
+move 4 from 7 to 1
+move 3 from 2 to 6
+move 2 from 5 to 1
+move 6 from 1 to 6
+move 4 from 3 to 5
+move 4 from 5 to 3
+move 1 from 4 to 8
+move 3 from 3 to 2
+move 17 from 8 to 4
+move 6 from 6 to 3
+move 14 from 4 to 9
+move 1 from 3 to 8
+move 1 from 7 to 4
+move 3 from 8 to 3
+move 5 from 2 to 5
+move 6 from 1 to 7
+move 2 from 6 to 4
+move 4 from 5 to 7
+move 1 from 1 to 5
+move 1 from 6 to 3
+move 10 from 7 to 4
+move 1 from 5 to 4
+move 1 from 2 to 3
+move 15 from 4 to 5
+move 3 from 3 to 1
+move 6 from 2 to 6
+move 1 from 2 to 3
+move 2 from 4 to 7
+move 2 from 7 to 8
+move 1 from 4 to 2
+move 2 from 1 to 7
+move 1 from 7 to 2
+move 12 from 9 to 1
+move 4 from 9 to 5
+move 4 from 6 to 2
+move 1 from 7 to 3
+move 6 from 2 to 4
+move 1 from 8 to 5
+move 2 from 4 to 2
+move 11 from 1 to 7
+move 3 from 1 to 4
+move 17 from 5 to 6
+move 15 from 6 to 4
+move 1 from 8 to 9
+move 10 from 4 to 1
+move 1 from 3 to 9
+move 2 from 6 to 5
+move 1 from 2 to 6
+move 4 from 5 to 6
+move 4 from 1 to 2
+move 6 from 6 to 7
+move 2 from 2 to 6
+move 9 from 4 to 9
+move 6 from 1 to 2
+move 3 from 4 to 1
+move 10 from 9 to 8
+move 4 from 2 to 1
+move 1 from 1 to 2
+move 5 from 8 to 6
+move 1 from 2 to 7
+move 1 from 9 to 4
+move 2 from 6 to 9
+move 13 from 7 to 2
+move 5 from 7 to 5
+move 2 from 5 to 2
+move 1 from 4 to 5
+move 4 from 8 to 4
+move 17 from 2 to 6
+move 3 from 4 to 6
+move 2 from 9 to 1
+move 7 from 6 to 8
+move 1 from 5 to 2
+move 1 from 4 to 1
+move 2 from 9 to 4
+move 1 from 3 to 9
+move 4 from 3 to 7
+move 2 from 8 to 5
+move 3 from 7 to 5
+move 10 from 5 to 8
+move 2 from 2 to 4
+move 6 from 1 to 2
+move 4 from 6 to 3
+move 8 from 2 to 6
+move 1 from 7 to 4
+move 5 from 4 to 5
+move 7 from 6 to 7
+move 5 from 3 to 5
+move 5 from 5 to 2
+move 4 from 8 to 1
+move 6 from 1 to 6
+move 3 from 3 to 2
+move 22 from 6 to 2
+move 1 from 9 to 7
+move 8 from 8 to 6
+move 1 from 7 to 6
+move 2 from 5 to 7
+move 4 from 8 to 5
+move 7 from 6 to 7
+move 2 from 6 to 4
+move 14 from 2 to 1
+move 7 from 1 to 3
+move 12 from 7 to 3
+move 1 from 4 to 3
+move 2 from 5 to 8
+move 2 from 8 to 1
+move 1 from 4 to 3
+move 6 from 2 to 9
+move 6 from 9 to 2
+move 2 from 2 to 7
+move 6 from 7 to 5
+move 13 from 3 to 5
+move 5 from 2 to 6
+move 5 from 6 to 1
+move 2 from 3 to 6
+move 1 from 6 to 5
+move 1 from 6 to 1
+move 3 from 1 to 9
+move 6 from 2 to 7
+move 1 from 2 to 3
+move 24 from 5 to 2
+move 7 from 3 to 7
+move 13 from 7 to 9
+move 4 from 1 to 9
+move 4 from 1 to 6
+move 1 from 5 to 6
+move 16 from 9 to 5
+move 1 from 6 to 4
+move 1 from 5 to 2
+move 5 from 1 to 3
+move 11 from 2 to 1
+move 4 from 9 to 6
+move 1 from 4 to 7
+move 2 from 3 to 4
+move 6 from 6 to 9
+move 1 from 1 to 3
+move 2 from 9 to 4
+move 1 from 7 to 9
+move 4 from 2 to 9
+move 8 from 9 to 2
+move 3 from 3 to 2
+move 1 from 9 to 4
+move 5 from 1 to 7
+move 1 from 4 to 8
+move 2 from 1 to 9
+move 1 from 8 to 7
+move 6 from 5 to 3
+move 1 from 5 to 1
+move 5 from 2 to 3
+move 4 from 1 to 5
+move 4 from 7 to 1
+move 8 from 5 to 8
+
diff --git a/advent-of-code/2022/06/1.c b/advent-of-code/2022/06/1.c
new file mode 100644
index 0000000..30a64d9
--- /dev/null
+++ b/advent-of-code/2022/06/1.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdbool.h>
+
+bool succ(char *buf) {
+    bool table[26] = {0};
+    for (int i = 0; i < 4; i++) {
+        if(!table[buf[i] - 'a']) table[buf[i] - 'a'] = true;
+        else return false;
+    }
+    return true;
+}
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    char buf[4] = {0};
+    int i = 0;
+    int c;
+    while ((c = fgetc(fp)) != EOF) {
+        if (c < 'a' || c > 'z') continue;
+        buf[i % 4] = c;
+        if (i >= 4 && succ(buf)) break;
+        i++;
+    }
+    printf("%d\n", i+1);
+    return 0;
+}
diff --git a/advent-of-code/2022/06/2.c b/advent-of-code/2022/06/2.c
new file mode 100644
index 0000000..4cf030c
--- /dev/null
+++ b/advent-of-code/2022/06/2.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdbool.h>
+
+bool succ(char *buf) {
+    bool table[26] = {0};
+    for (int i = 0; i < 14; i++) {
+        if(!table[buf[i] - 'a']) table[buf[i] - 'a'] = true;
+        else return false;
+    }
+    return true;
+}
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    char buf[14] = {0};
+    int i = 0;
+    int c;
+    while ((c = fgetc(fp)) != EOF) {
+        if (c < 'a' || c > 'z') continue;
+        buf[i % 14] = c;
+        if (i >= 14 && succ(buf)) break;
+        i++;
+    }
+    printf("%d\n", i+1);
+    return 0;
+}
diff --git a/advent-of-code/2022/06/input b/advent-of-code/2022/06/input
new file mode 100644
index 0000000..d572eb4
--- /dev/null
+++ b/advent-of-code/2022/06/input
@@ -0,0 +1,2 @@
+plhlsssjsrscspsffmrffwvfvrvvmbbnjnrnrfnndlnlznlznlnccdbbhvbvgvmvzmzvmzmbbrcclsslzslzzsztzftzzhggnjgnjnhnmnqnqqfdfnnrwnwsnwwvgvqqgpptvtrvvfmmzjzmmjssmwsmmhzzvvwzwcwrcrllpbppdgdvvwqvvsnsrnsncnwntnggwqgqhqrqprqrddjvddqsqhshchfffzddswdsshhcnhnqqfjffvlvwvssdqqwrwvrvhrvrzzgwggcjcgclcwchhzvzmzrrjwjqwwvbwwrmmvmpmzpzgpgsghgrrtmmlfmmnzzmpzzvmvjjsqqshqshsqqgtqggpvvrtttwbbhnbnlbnlnhnthtjhjshhrmrjjlclpprmrnrsrwrbwrwwjnwnbwbhbmbggdbgghllcvlvddzbdbdvdwvdvjvqvcvczvcvclvvrggrngrrwcwbcczgghnhznhnttbcbvcvttrrpbrppndppvvvgvtgvvhfvhhttppjmjllznlnldnldlwlnwlnlttgzzcfcggwmgmqgmmshmhqqdfqfpfqppprzrhrnrhnrrtsrrgpgnpngnqnmmrtrvtrrfccszszffvlfvlvssvdvvpggvcvscvvpmpgpqpfqqhttrhhsbhbqhhzggzrgrqrfqffwllggrgqqjzqzzsgglvgllsgllptltblbggvrggctczzllvsvcscrrzjrzzjnnbvvtntpntnvtntcntcnnwsnnnvjnnsccsddcvvgzgwggbnbwnwbwmwttzzsgzzjpzztwztwwhhzggplgplggwwwphpmmhchsccmwmttvjtjftffzbfffjljbbqvvstsggbbqrbqrbrhbbrmbmppvrpphptpggqgddtmdtmdmbbbcdbbgssmzzthhtjjrgjrgrzzchzhttgddjnjrjmjllrcrqqsvsjjjhvvphhgjhgjhjccwmcmjcmjmhmzznmmcbcscddcsssnppsnpnmnqmmtztftqtjtqqgvgvjjfnjffqbqbfqqwfqfcfsfttvccnssjvvpfvpvttvpvccwhwfwlwlclljqqststllgqgzqqfpflpplpssnntstqqpnnsrnsrrsvrsvsrvsrrtztmtptpcpssgnnfvflffscsqszzsppfnftfptfpfnfbbwzbzfbbtggrzrnntztnznhnnlbnbrbdddjhjchhdshhnzhnnsrnrrqwrrdsdlsstdsslqsqdqvqzvqvwqqlmmwzmwzwztzlzczhqfrclvgvnlchrggsrjhntctdbpfdcffwjngdvdrjmgvwvptlvlhvhshqphmrdznqbtchcvrwfrpvwhzmrwlcjwnrsgrqcbsgpwjthstvqzlwjjmqbvhhdfdsmqnmnswmwjtpgjhdpgcnvmlcjwjzrjhmrqmqnrqrmgdnbdgznwhgzncmcbzpntcdflvrbfdzwgpnqjqmrcqpbrzwhwdgtgshhmrwvhnrwslvcswjvdgglfrdvmqdspppwmvfzvdbvpcnhmvgfqwnvjvvzrvttwvbjrbjlllmwtlcltvqmwshnqsdtjrptvqjvdjgzwgzzhcdbwjzhdgsptfrtmmqvhsnsnpgwbncbnnvwmmrrjgfccbzcpcjmqvqsbvjrstzblsrngphwndfdswjnnnfdgpcbslvbjglqqnbbtjljsmdgcslmwlvgwpsqthlmmqfgpgmcvrpvvtzcjdrwcjgrbwthblwpwpbzvjvhzsphmfhfwvsthlfnhhfcmpsnmgrvrntlzpdvqwtrghnslnfhcjwrsvrngqqtwvcsfhbjwmsnmsmgvdhnzjgljtchbtwlfppvbtdclbdjdmwzcntvgfjlcwdplnjwqnzqhnfgcnbrgftqpdmqzrrhglbzzvjcdnbtfnvmsrbjdzhbqmhnsmprgvjzzgvllhqnzgpstqzcnlgsrcwzlhwqvcjlwnnjslmdtwqcpbrntrmrmmtscjwwtzjhghtqvvpldzvhtmspzlnlfgrfhmsndbdgpgvphwwgqhrtlwztgqqsrwnrnqphqfsrtbztqbrgmfbtpjwhhrglhbzmmjptppnfdzlpbqfcbdwzdtqbrvfmtdzdjlnzvqfnzmttpqgzgmrqwmdtmdzrttffpdlgwdhnlrhnnztphvrbzcrlvcpswlngcjhdzqwwwpzdmhhwpnzwgjsdsdbdvpfsrwmwvsggpcqbchwjpgljnbtpvjzbbvgsbsbjmtwtbjtzzsfvrmfvnmcngvvdsvljvjbrlfgstjrhtjplttzhjfbmphvbqdsmwfwspqpcvmgzgjnqlphshlgdwcvtmpwcfgdcbqwpnshfgrfjvlrtqbffwwtbnwtvjlsdgwgfmhlrsmfrjzcwccdzfwwdwhwdsjbllhjsqmnqvngvdmbvbssfjtjfbtngrdwgldcrtpmvrbrmpvwwsfrlnbqsqzfnftpbhslqccnbqwgbdbfpblpmwbgjzmnptnhdjzqjhdrhqbtfhsrdqwlmwzqlsmmslgfzpvtgtsrlszvqrhrzclbqhzzwwfmhrrvsrnsjbdjsqqlsmgdmgbdtmvfjmsbwjqmqrvrhqbchpqrwvlvwpvhjlbdzfjvrwmchccrsrfvhzmpfjqwnrbvqmgwjcbndjdtfgnrzrqwgzhrdvghdrvgtplcrthgchmvwtdrchfwpdszzzhqpmrlzvfdnfnlwghmmwvsscbrdbchhgttsnbzdbqgddqfvcgvqwltnqtcwrmhtftnlwvlglsvvctccnntznsjnmmgqlzmplsdspnjtmzlbvrfzfclnhgjzmvntdwhspqwtpgndspnjqjqwrpwhjhpvjwfptpndnwvcjdwsvdtcrtwpsprgmrspgmcsdgtjbbgsgvcjhrcldlvgvqwqwthplzgwbzmszjfrlnznvgphnqzcwsztvvljlrlzrndbzccstprhntnlmshhclnrsmsvvvsbmpfdjsmspwcqtmlrrdmfzjjjhmsmdfqddzpgtbzbsnhhhpsfrdrdvpvpnjmvnhdrzrqggrpqdcmctvqfrtfmjjqjwgzzbrdfplhzjbnqlmjlcgvmsbpgdlfjmbgqtrvzzdgtlmbqthjrdtlstqtzqvfjvmmstsmtsbnjvstjjvrrjqcbjvhfpslpvjmdznrcnsvlpbpzmslqtpczmvhdwzrhwbwtfvrrmbszvrhwsjrclcscgngwvblbbrqprgshwzhlqgwmpfsmqsvpjbdccdmtnnhqfwvlgjlszmmmdmtmpzwhplzsjztrnwngbvspqqbmghwzgvfjdrblfmtwcvnczsrflmsjmrsvzldmttjwcmnvwcbjfvznhgntnqfbfchcqqshhjldgltqhdlqldlpfjnjvtbvbntzdjzstcqbzdnmsvcdgvjmmvtdfvdplqfndqqlzlspmjgdfbgsvwzqzsvvbbldltbtzwzpqrzfmfzgdbpqnwtrfcgwmlbpzrgscbjvfdwnjzjdfzltsbppnljzrgggplmttpmgwnhdlwfhwzsrcflnrqqzwsbqllwjqlrgwbhvcvqdvjvpbzgnfbbbtccvplzggplbrsbldllwmttwtvltsfljfbbprtvlfshhwdhdgvzfzjttvnphpnjnzsbvfwflfpqwnhvwjdsrtbwsjzqhgfldnssfbbzzqqrwtjvwjschmndgqzjtpsbfhwtmqbtfstrbghgtnldjqtshdnrwzvwddchhvdbsfjnqzfjdpvhvwwjspftgbtgwzdfgzzhpvjpdlrrdfnpftshthwzjzmzdghnfdqcbmjhfdgzrcgrzbrjtmhwbjhcpgjdsmnqzncdlwhqqzqblgdbbdsmrqgbdbmdczvvpnbbjdwrlmrwgnnbbzpcnsjgcmshgzwnjzwjlrdmvmhvjrzphgpczppqvwjthcdphprhhrggjdpzmgtpjjfvpczzrvsssfrrptnzlstrhmbhvzmwjnddshrrtgspbllvqlsptrtvtldsgnjjbwtfmtbjdvmgbptjlzhpttjmvpgnjphswhtdq
+
diff --git a/advent-of-code/2022/07/1.c b/advent-of-code/2022/07/1.c
new file mode 100644
index 0000000..40f96a3
--- /dev/null
+++ b/advent-of-code/2022/07/1.c
@@ -0,0 +1,101 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct dir Dir;
+
+#define LOG(s) fprintf(stderr, s"\n");
+
+struct dir {
+    char name[32];
+    Dir *parent;
+    Dir *next_sibling;
+    Dir *child;
+    int size;
+};
+
+char buf[4096];
+
+Dir root = {0};
+
+int sum = 0;
+
+int totalsize(Dir *dir) {
+    if (dir == NULL) return 0;
+    int total = dir->size;
+    Dir *child = dir->child;
+    while (child != NULL) {
+        total += totalsize(child);
+        child = child->next_sibling;
+    }
+    if (total <= 100000) sum += total;
+    return total;
+}
+
+void process_ls(FILE* fp, Dir *cur) {
+    while (1) {
+        int c = fgetc(fp);
+        if (c == EOF) return;
+        ungetc(c, fp);
+        if (c == '$') {
+            return;
+        }
+        buf[0] = '\0';
+        fgets(buf, 4096, fp);
+        if (buf[0] == 'd') {
+            strtok(buf, " ");
+            char *childname = strtok(NULL, "\n");
+            Dir *newdir = malloc(sizeof(Dir));
+            strcpy(newdir->name, childname);
+            newdir->parent = cur;
+            newdir->next_sibling = cur->child;
+            newdir->child = NULL;
+            newdir->size = 0;
+            cur->child = newdir;
+        } else {
+            char *pos;
+            long fsz = strtol(buf, &pos, 10);
+            cur->size += fsz;
+        }
+    }
+}
+
+void process_cmd(FILE *fp, Dir **pcur) {
+    Dir *cur = *pcur;
+    char *cmd = strtok(buf + 2, " \n"); 
+    if (strcmp(cmd, "cd") == 0) {
+        char *param = strtok(NULL, " \n"); 
+        if (strcmp(param, "/") == 0) {
+            *pcur = &root;
+        } else if (strcmp(param, "..") == 0) {
+            *pcur = cur->parent;
+        } else {
+            Dir *t = cur->child;
+            while (t != NULL) {
+                if (strcmp(t->name, param) == 0) {
+                    *pcur = t;
+                    break;
+                } else {
+                    t = t->next_sibling;
+                }
+            }
+        }
+    } else if (strcmp(cmd, "ls") == 0) {
+        process_ls(fp, cur);
+    }
+}
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    Dir *cur = &root;
+    while (fgets(buf, 4096, fp)) {
+        int len = strlen(buf);
+        if (len <= 1) continue;
+        char c = buf[0];
+        if (c == '$') {
+            process_cmd(fp, &cur);
+        }
+    }
+    totalsize(&root);
+    printf("%d\n", sum);
+}
diff --git a/advent-of-code/2022/07/2.c b/advent-of-code/2022/07/2.c
new file mode 100644
index 0000000..d19df08
--- /dev/null
+++ b/advent-of-code/2022/07/2.c
@@ -0,0 +1,106 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+typedef struct dir Dir;
+
+#define LOG(s) fprintf(stderr, s"\n");
+
+struct dir {
+    char name[32];
+    Dir *parent;
+    Dir *next_sibling;
+    Dir *child;
+    int size;
+};
+
+char buf[4096];
+
+Dir root = {0};
+
+int need = INT_MAX;
+int to_del = INT_MAX;
+
+int totalsize(Dir *dir) {
+    if (dir == NULL) return 0;
+    int total = dir->size;
+    Dir *child = dir->child;
+    while (child != NULL) {
+        total += totalsize(child);
+        child = child->next_sibling;
+    }
+    if (total >= need && total < to_del) to_del = total;
+    return total;
+}
+
+void process_ls(FILE* fp, Dir *cur) {
+    while (1) {
+        int c = fgetc(fp);
+        if (c == EOF) return;
+        ungetc(c, fp);
+        if (c == '$') {
+            return;
+        }
+        buf[0] = '\0';
+        fgets(buf, 4096, fp);
+        if (buf[0] == 'd') {
+            strtok(buf, " ");
+            char *childname = strtok(NULL, "\n");
+            Dir *newdir = malloc(sizeof(Dir));
+            strcpy(newdir->name, childname);
+            newdir->parent = cur;
+            newdir->next_sibling = cur->child;
+            newdir->child = NULL;
+            newdir->size = 0;
+            cur->child = newdir;
+        } else {
+            char *pos;
+            long fsz = strtol(buf, &pos, 10);
+            cur->size += fsz;
+        }
+    }
+}
+
+void process_cmd(FILE *fp, Dir **pcur) {
+    Dir *cur = *pcur;
+    char *cmd = strtok(buf + 2, " \n"); 
+    if (strcmp(cmd, "cd") == 0) {
+        char *param = strtok(NULL, " \n"); 
+        if (strcmp(param, "/") == 0) {
+            *pcur = &root;
+        } else if (strcmp(param, "..") == 0) {
+            *pcur = cur->parent;
+        } else {
+            Dir *t = cur->child;
+            while (t != NULL) {
+                if (strcmp(t->name, param) == 0) {
+                    *pcur = t;
+                    break;
+                } else {
+                    t = t->next_sibling;
+                }
+            }
+        }
+    } else if (strcmp(cmd, "ls") == 0) {
+        process_ls(fp, cur);
+    }
+}
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    Dir *cur = &root;
+    while (fgets(buf, 4096, fp)) {
+        int len = strlen(buf);
+        if (len <= 1) continue;
+        char c = buf[0];
+        if (c == '$') {
+            process_cmd(fp, &cur);
+        }
+    }
+    int total = totalsize(&root);
+    int unused = 70000000 - total;
+    need = 30000000 - unused;
+    totalsize(&root);
+    printf("%d\n", to_del);
+}
diff --git a/advent-of-code/2022/07/input b/advent-of-code/2022/07/input
new file mode 100644
index 0000000..cd3de07
--- /dev/null
+++ b/advent-of-code/2022/07/input
@@ -0,0 +1,989 @@
+$ cd /
+$ ls
+dir bqc
+dir mwmlf
+dir ngn
+143562 nrwjb
+78449 qqvdcclf
+dir qrnm
+dir smfzmmhc
+116085 tvrms
+dir vrdrsj
+$ cd bqc
+$ ls
+5693 qqvdcclf
+$ cd ..
+$ cd mwmlf
+$ ls
+dir cmfphpc
+dir lqqshq
+dir mwmlf
+dir rlf
+dir smfzmmhc
+$ cd cmfphpc
+$ ls
+235620 tprth.gjn
+82743 vrdrsj.fbl
+$ cd ..
+$ cd lqqshq
+$ ls
+94188 crswqlvd.nsj
+dir dttthls
+60078 lbsfsspm
+dir lqp
+74624 nrwjb
+247709 tjhcqw.wrq
+267693 tvrms
+dir zshrcgfn
+$ cd dttthls
+$ ls
+109072 nrwjb
+31512 qqvdcclf
+$ cd ..
+$ cd lqp
+$ ls
+237917 nrwjb
+45489 vrdrsj.ntw
+$ cd ..
+$ cd zshrcgfn
+$ ls
+185533 smfzmmhc.zzd
+$ cd ..
+$ cd ..
+$ cd mwmlf
+$ ls
+dir bbvhpmsj
+dir mwmlf
+83589 qqvdcclf
+$ cd bbvhpmsj
+$ ls
+232123 hrvlgmjb.wrv
+137190 rlf
+21785 tghvbj.mfr
+25344 vrdrsj.swp
+$ cd ..
+$ cd mwmlf
+$ ls
+dir wnn
+$ cd wnn
+$ ls
+dir thd
+$ cd thd
+$ ls
+36125 lgt
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd rlf
+$ ls
+dir fps
+128272 lggpfj.gnr
+146745 lrdq.zgm
+dir mwmlf
+266383 mwmlf.wnp
+dir ncrlvggp
+dir qpgmrj
+$ cd fps
+$ ls
+dir rqjt
+dir wpqvmn
+$ cd rqjt
+$ ls
+175784 pcdtdblc.znj
+185424 wmstvdt.lhn
+$ cd ..
+$ cd wpqvmn
+$ ls
+141743 ljslzhjl
+$ cd ..
+$ cd ..
+$ cd mwmlf
+$ ls
+169015 rlf
+$ cd ..
+$ cd ncrlvggp
+$ ls
+81450 fqtrpm.mqr
+146399 jtbr
+dir nnqgqqj
+288302 qqvdcclf
+$ cd nnqgqqj
+$ ls
+dir fvbhh
+$ cd fvbhh
+$ ls
+121112 zmn.fjz
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd qpgmrj
+$ ls
+dir hrvlgmjb
+dir pbc
+$ cd hrvlgmjb
+$ ls
+7858 czvpvwz
+$ cd ..
+$ cd pbc
+$ ls
+150816 tprth.gjn
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd smfzmmhc
+$ ls
+dir jwvw
+184385 spbjrlv.spt
+dir trpdgl
+201578 zzhz
+$ cd jwvw
+$ ls
+47747 nrwjb
+$ cd ..
+$ cd trpdgl
+$ ls
+136682 mwmlf
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ngn
+$ ls
+dir fqbph
+282363 lscdth.lbj
+dir mwmlf
+273281 qbpmcqs
+7547 qdffbp
+223960 tprth.gjn
+$ cd fqbph
+$ ls
+dir bgtbmzj
+dir lzjf
+12361 nrwjb
+dir pdsdttz
+150218 pfvtwr.pbf
+dir rlf
+158227 sfhsszcq.tzv
+183244 smfzmmhc.drh
+$ cd bgtbmzj
+$ ls
+dir gvqhtfg
+dir jmvzv
+194008 ldpfs.qhr
+dir mtztr
+11099 nfqmvqcm.ftd
+dir szp
+153379 zrtsd.jwg
+$ cd gvqhtfg
+$ ls
+dir ntq
+dir rlf
+62076 rlf.nlc
+$ cd ntq
+$ ls
+dir wdtzhz
+$ cd wdtzhz
+$ ls
+dir tlqcbp
+$ cd tlqcbp
+$ ls
+102930 smfzmmhc
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd rlf
+$ ls
+185079 tjhcqw.wrq
+$ cd ..
+$ cd ..
+$ cd jmvzv
+$ ls
+dir hfmtzbhf
+61556 jzbvmc
+dir scjpjp
+237487 sgh
+dir smfzmmhc
+$ cd hfmtzbhf
+$ ls
+dir ldt
+136126 tvrms
+$ cd ldt
+$ ls
+dir smfzmmhc
+dir wrhpzrfm
+dir zbcfv
+$ cd smfzmmhc
+$ ls
+86537 tjhcqw.wrq
+$ cd ..
+$ cd wrhpzrfm
+$ ls
+263122 smfzmmhc.shv
+73772 tvrms
+$ cd ..
+$ cd zbcfv
+$ ls
+dir vrdrsj
+$ cd vrdrsj
+$ ls
+220800 zwdbh
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd scjpjp
+$ ls
+38282 rlf
+93306 rlf.blz
+$ cd ..
+$ cd smfzmmhc
+$ ls
+dir gqms
+dir mwmlf
+21587 nrwjb
+184621 zvq.lvr
+$ cd gqms
+$ ls
+dir frbs
+dir rlf
+$ cd frbs
+$ ls
+dir mpdll
+82901 zdmnm.wlc
+$ cd mpdll
+$ ls
+dir mgqd
+dir mrljj
+$ cd mgqd
+$ ls
+75558 vrdrsj.zwc
+$ cd ..
+$ cd mrljj
+$ ls
+dir qmsgj
+128171 qqvdcclf
+245942 rlf.hgt
+dir zzvbt
+$ cd qmsgj
+$ ls
+7382 mwmlf
+$ cd ..
+$ cd zzvbt
+$ ls
+285714 zltjmn
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd rlf
+$ ls
+43731 gttgwfgf.cpd
+dir hvtn
+112018 jdhb.ssj
+195239 rlf.gvd
+200476 spsstb
+$ cd hvtn
+$ ls
+dir zzsfgzc
+$ cd zzsfgzc
+$ ls
+116544 vrdrsj
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd mwmlf
+$ ls
+dir hmpvn
+dir shlnfcpz
+$ cd hmpvn
+$ ls
+55892 qqvdcclf
+$ cd ..
+$ cd shlnfcpz
+$ ls
+144766 fnrhmbbm.rnp
+2622 tjhcqw.wrq
+219884 tprth.gjn
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd mtztr
+$ ls
+dir plngmzl
+dir qbwzhr
+$ cd plngmzl
+$ ls
+153434 dhjv.pfn
+$ cd ..
+$ cd qbwzhr
+$ ls
+26553 mcb.djg
+$ cd ..
+$ cd ..
+$ cd szp
+$ ls
+37741 qqvdcclf
+dir vrdrsj
+$ cd vrdrsj
+$ ls
+dir hznmsclb
+13218 mwmlf.vhs
+102602 rggt
+228549 rlnf.qrt
+$ cd hznmsclb
+$ ls
+17957 mwmlf.lsv
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd lzjf
+$ ls
+40821 lfgh.jwg
+dir rplfgb
+$ cd rplfgb
+$ ls
+301639 zmrpm.pqn
+$ cd ..
+$ cd ..
+$ cd pdsdttz
+$ ls
+294779 tprth.gjn
+$ cd ..
+$ cd rlf
+$ ls
+37853 qst.zgc
+$ cd ..
+$ cd ..
+$ cd mwmlf
+$ ls
+dir dqvhgnj
+dir fvjtnl
+dir jfsgp
+230725 tjhcqw.wrq
+2872 tvrms
+dir zszcsbl
+$ cd dqvhgnj
+$ ls
+214328 bph
+138045 tjhcqw.wrq
+$ cd ..
+$ cd fvjtnl
+$ ls
+62568 sllvfsf
+286839 tjhcqw.wrq
+241004 zvqrg.bsg
+$ cd ..
+$ cd jfsgp
+$ ls
+116677 tprth.gjn
+151347 vtbt
+$ cd ..
+$ cd zszcsbl
+$ ls
+97786 hrvlgmjb.wzz
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd qrnm
+$ ls
+70534 nrwjb
+292701 qqvdcclf
+153174 sjqvgh.nvt
+$ cd ..
+$ cd smfzmmhc
+$ ls
+dir gjrqmcjl
+63451 hrvlgmjb
+dir mwmlf
+dir ncgjsjj
+246754 nrwjb
+dir pvnbj
+dir sjqwr
+dir vrdrsj
+dir vwfnglr
+$ cd gjrqmcjl
+$ ls
+283020 gwcrpgc
+36180 ltmzzz
+dir tpsr
+$ cd tpsr
+$ ls
+51208 nscwcztf.wlh
+121548 smfzmmhc
+$ cd ..
+$ cd ..
+$ cd mwmlf
+$ ls
+263186 mwmlf.fqd
+$ cd ..
+$ cd ncgjsjj
+$ ls
+204801 nrwjb
+116293 rdrmctwg.nqc
+36548 tjhcqw.wrq
+$ cd ..
+$ cd pvnbj
+$ ls
+dir cfmn
+dir cnhmcjp
+231615 ctllrm
+dir czmw
+dir drfzgwtz
+135330 jsm
+dir jtjzwjh
+dir nfg
+279734 qqvdcclf
+220762 tvrms
+35964 vrdrsj.jqj
+$ cd cfmn
+$ ls
+300636 frn.ccd
+dir qmtc
+dir sfvd
+$ cd qmtc
+$ ls
+267669 jwvjslwp.vsp
+180586 tvrms
+$ cd ..
+$ cd sfvd
+$ ls
+169064 cgzmwg.rgr
+dir hsz
+270729 qgmmc.sqq
+dir qpzbffd
+92811 shcpdlm.nwz
+dir sstdzdf
+dir thrzw
+dir wscsr
+$ cd hsz
+$ ls
+301584 qqvdcclf
+$ cd ..
+$ cd qpzbffd
+$ ls
+264911 mwmlf.rvg
+dir rlf
+32109 svhwhw.fdp
+155713 tjhcqw.wrq
+dir vrdrsj
+$ cd rlf
+$ ls
+32357 tvrms
+$ cd ..
+$ cd vrdrsj
+$ ls
+93501 nrwjb
+$ cd ..
+$ cd ..
+$ cd sstdzdf
+$ ls
+241812 mgrvcbjc.rqb
+dir mwmlf
+273819 nvrssljz
+156873 tvrms
+$ cd mwmlf
+$ ls
+133649 wdfvctwp
+$ cd ..
+$ cd ..
+$ cd thrzw
+$ ls
+67552 smfzmmhc
+$ cd ..
+$ cd wscsr
+$ ls
+132663 dnbvw.zwd
+dir ffthd
+293463 hrvlgmjb.fwh
+dir lhjvfdh
+194357 nrwjb
+dir smj
+56668 tprth.gjn
+303099 tvrms
+dir vrdrsj
+$ cd ffthd
+$ ls
+84952 nrwjb
+192566 rlf
+dir slbg
+78478 srzz
+250044 tprth.gjn
+97100 tvrms
+$ cd slbg
+$ ls
+203375 nrwjb
+39137 qqvdcclf
+$ cd ..
+$ cd ..
+$ cd lhjvfdh
+$ ls
+1747 rtphln.pgc
+163505 tjhcqw.wrq
+76891 tprth.gjn
+$ cd ..
+$ cd smj
+$ ls
+6853 hhtdhzgn
+158303 pmsflvrn.hnh
+$ cd ..
+$ cd vrdrsj
+$ ls
+dir jdlc
+263568 vrdrsj
+dir vvtl
+$ cd jdlc
+$ ls
+12435 hqggp.lrq
+292141 ntbcht.zbw
+$ cd ..
+$ cd vvtl
+$ ls
+118913 qqvdcclf
+291087 tjhcqw.wrq
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd cnhmcjp
+$ ls
+263233 tjhcqw.wrq
+$ cd ..
+$ cd czmw
+$ ls
+dir gdsgw
+dir gfd
+3390 mwmlf.zss
+$ cd gdsgw
+$ ls
+298839 dbwsmwnb.svt
+170672 tprth.gjn
+$ cd ..
+$ cd gfd
+$ ls
+193212 tld
+$ cd ..
+$ cd ..
+$ cd drfzgwtz
+$ ls
+257122 tprth.gjn
+$ cd ..
+$ cd jtjzwjh
+$ ls
+dir jhpp
+274740 lnrwrpjj
+35217 ptzmfsmr.pwc
+67549 qpdj.pfc
+$ cd jhpp
+$ ls
+40279 jgstzhw.cbq
+$ cd ..
+$ cd ..
+$ cd nfg
+$ ls
+126237 mqfl.flt
+$ cd ..
+$ cd ..
+$ cd sjqwr
+$ ls
+53423 bngqncqn
+dir lblv
+178935 nrwjb
+188826 tprth.gjn
+dir vrdrsj
+286449 vrdrsj.svn
+$ cd lblv
+$ ls
+dir bptgd
+215281 jjvcgb.nwc
+dir rlf
+300004 tvrms
+$ cd bptgd
+$ ls
+19667 mwmlf
+$ cd ..
+$ cd rlf
+$ ls
+dir mwmlf
+263985 rbhz.plr
+$ cd mwmlf
+$ ls
+254206 smfzmmhc
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd vrdrsj
+$ ls
+dir vrdrsj
+$ cd vrdrsj
+$ ls
+250310 hrvlgmjb.bbf
+130543 mwmlf.lbq
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd vrdrsj
+$ ls
+dir mwwr
+dir rlf
+$ cd mwwr
+$ ls
+dir lhz
+$ cd lhz
+$ ls
+dir ssz
+dir vrdrsj
+$ cd ssz
+$ ls
+107472 hcnsgjhj
+$ cd ..
+$ cd vrdrsj
+$ ls
+303694 rlf
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd rlf
+$ ls
+299875 nrwjb
+$ cd ..
+$ cd ..
+$ cd vwfnglr
+$ ls
+dir mtvgvvcr
+114118 mzhgbj.zvv
+273343 tprth.gjn
+28259 wgrp
+$ cd mtvgvvcr
+$ ls
+218927 bvlv.npm
+64283 hrf.czg
+dir mnmqqqgh
+103691 qtb.fnb
+dir smfzmmhc
+252712 zjlgc.sfg
+$ cd mnmqqqgh
+$ ls
+231583 hrvlgmjb.mtq
+$ cd ..
+$ cd smfzmmhc
+$ ls
+dir dzjfd
+dir jjslqwn
+264128 nrwjb
+257359 tvrms
+$ cd dzjfd
+$ ls
+dir smfzmmhc
+237116 zzgr
+$ cd smfzmmhc
+$ ls
+230613 qqvdcclf
+91615 smfzmmhc
+$ cd ..
+$ cd ..
+$ cd jjslqwn
+$ ls
+98708 mwmlf.qtq
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd vrdrsj
+$ ls
+dir bfgbvlcd
+131293 fgh.djg
+125876 lcwjtdf.sbl
+dir pnds
+263022 tvrms
+$ cd bfgbvlcd
+$ ls
+276134 vrdrsj
+$ cd ..
+$ cd pnds
+$ ls
+dir bffz
+dir jwcjpt
+dir pvnbz
+$ cd bffz
+$ ls
+194315 dndbj.gww
+115061 lspnmhml.fdb
+239758 tjhcqw.wrq
+124732 wjcbcvfd
+$ cd ..
+$ cd jwcjpt
+$ ls
+dir dcmcgc
+dir llt
+dir rfh
+dir scljqqq
+127542 tvrms
+$ cd dcmcgc
+$ ls
+dir fhdvgvtz
+dir hrvlgmjb
+dir rlf
+dir smfzmmhc
+$ cd fhdvgvtz
+$ ls
+33684 lcl
+dir lrsjg
+203352 npvgs.qdw
+6985 tvrms
+102991 wmnrjw.chn
+162852 wrcjmll.rlb
+$ cd lrsjg
+$ ls
+dir jgfpvdc
+84338 mwmlf.vdw
+147349 nrwjb
+dir sblp
+dir vrdrsj
+$ cd jgfpvdc
+$ ls
+265563 chlgpdsp.hrv
+dir dsc
+dir gvrg
+dir mwmlf
+dir qrqvl
+100762 rlf
+300872 sjvgwmdg.qhg
+164004 tzqmh
+300736 zhgmdcl.bfq
+$ cd dsc
+$ ls
+284520 rtt.qps
+263890 smfzmmhc
+$ cd ..
+$ cd gvrg
+$ ls
+dir hzclphlb
+dir vcnlmdp
+$ cd hzclphlb
+$ ls
+295429 mcdjsms.zss
+$ cd ..
+$ cd vcnlmdp
+$ ls
+dir wrlhqh
+$ cd wrlhqh
+$ ls
+41526 tmf.ctw
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd mwmlf
+$ ls
+dir cwsrt
+dir grqng
+$ cd cwsrt
+$ ls
+dir ztmtjwj
+$ cd ztmtjwj
+$ ls
+17063 svdm
+$ cd ..
+$ cd ..
+$ cd grqng
+$ ls
+216391 tvrms
+$ cd ..
+$ cd ..
+$ cd qrqvl
+$ ls
+1835 hrvlgmjb
+43155 mwmlf.sng
+238089 ngjg.zmc
+$ cd ..
+$ cd ..
+$ cd sblp
+$ ls
+178768 bgfnqf
+$ cd ..
+$ cd vrdrsj
+$ ls
+255854 qrrc.bbc
+178991 smfzmmhc
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd hrvlgmjb
+$ ls
+dir fjnp
+70585 hrvlgmjb
+dir qsrgzrdf
+43606 rmjzzgrs
+dir vds
+dir vrdrsj
+35098 wthtcg.wgd
+$ cd fjnp
+$ ls
+19740 qqvdcclf
+dir smfzmmhc
+$ cd smfzmmhc
+$ ls
+dir nnbc
+$ cd nnbc
+$ ls
+100360 mwmlf
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd qsrgzrdf
+$ ls
+279143 fgthp.qmg
+$ cd ..
+$ cd vds
+$ ls
+247595 gnclhrw.mwt
+303125 pcdnbq.zbs
+38092 tprth.gjn
+dir vrdrsj
+$ cd vrdrsj
+$ ls
+dir tnjg
+$ cd tnjg
+$ ls
+37395 brcbr
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd vrdrsj
+$ ls
+94639 tjhcqw.wrq
+$ cd ..
+$ cd ..
+$ cd rlf
+$ ls
+dir btqjc
+108141 dnplntn.mwr
+31100 lmfsgd
+263849 lpbdq.vdp
+109813 smfzmmhc.wsr
+dir vrdrsj
+$ cd btqjc
+$ ls
+31933 nwszgpm.qqr
+106249 rjqvhccg
+16766 vgzqz
+$ cd ..
+$ cd vrdrsj
+$ ls
+dir bfv
+dir jtnqr
+19593 mwmlf
+220657 rggqjp.pnt
+$ cd bfv
+$ ls
+48210 tdgd.ppw
+232603 tjhcqw.wrq
+$ cd ..
+$ cd jtnqr
+$ ls
+dir bct
+202702 grstm.ltj
+dir mwmlf
+258253 tvrms
+$ cd bct
+$ ls
+131860 fwfzsc.pls
+42452 thp
+$ cd ..
+$ cd mwmlf
+$ ls
+284648 vdjh.dct
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd smfzmmhc
+$ ls
+dir fvtlvtlq
+108335 jdbdb
+dir vrdrsj
+$ cd fvtlvtlq
+$ ls
+237419 ctwllbmc
+36570 qqvdcclf
+dir rlf
+92173 smfzmmhc
+$ cd rlf
+$ ls
+89469 dtg.bvl
+88361 mqrr
+$ cd ..
+$ cd ..
+$ cd vrdrsj
+$ ls
+47472 fftpd
+53118 qqvdcclf
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd llt
+$ ls
+98255 hnvqtbcn
+$ cd ..
+$ cd rfh
+$ ls
+29828 hgwh.tnl
+dir rchll
+dir smfzmmhc
+$ cd rchll
+$ ls
+240042 rdj.wrv
+$ cd ..
+$ cd smfzmmhc
+$ ls
+45192 clnbddrh.lbq
+105827 ndzjnttr
+140925 nmnr.lct
+dir rlf
+238998 tprth.gjn
+dir vrdrsj
+$ cd rlf
+$ ls
+115973 mnnr.smj
+75630 zld.hzv
+$ cd ..
+$ cd vrdrsj
+$ ls
+302512 phmvhpvb.fwh
+dir tjrpwhc
+$ cd tjrpwhc
+$ ls
+13802 hrvlgmjb
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd scljqqq
+$ ls
+228515 hrvlgmjb.nhn
+246019 mwmlf
+9535 mwmlf.nvm
+$ cd ..
+$ cd ..
+$ cd pvnbz
+$ ls
+dir hrvlgmjb
+279877 mwmlf
+dir zdqprndl
+278221 zwwtflb
+$ cd hrvlgmjb
+$ ls
+dir vggpr
+$ cd vggpr
+$ ls
+270197 cpzj
+$ cd ..
+$ cd ..
+$ cd zdqprndl
+$ ls
+197398 tprth.gjn
+
diff --git a/advent-of-code/2022/08/1.c b/advent-of-code/2022/08/1.c
new file mode 100644
index 0000000..6f69c97
--- /dev/null
+++ b/advent-of-code/2022/08/1.c
@@ -0,0 +1,106 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct {
+    uint8_t *data;
+    int rows;
+    int columns;
+    int cap;
+} Mat;
+
+int get(Mat *m, int row, int column) {
+    return m->data[row * m->columns + column];
+}
+
+void set(Mat *m, int row, int column, uint8_t value) {
+    m->data[row * m->columns + column] = value;
+}
+
+char buf[4096];
+
+int main() {
+    Mat m;
+    m.data = malloc(4096);
+    m.cap = 4096;
+    m.rows = 0;
+    m.columns = 0;
+    
+    
+    FILE *fp = fopen("input", "r");
+    while(fgets(buf, 4096, fp)) {
+        int len = strlen(buf);
+        if (len <= 1) break;
+        if (m.columns == 0) m.columns = len - 1;
+        while (m.cap < (m.rows + 1) * m.columns) {
+            m.data = realloc(m.data, m.cap * 2);
+            m.cap *= 2;
+        }
+        memcpy(m.data + m.rows * m.columns, buf, m.columns);
+        m.rows++;
+    }
+    
+    Mat vis = m;
+    vis.data = malloc(m.rows * m.columns);
+    vis.cap = m.rows * m.columns;
+    memset(vis.data, 0, vis.cap);
+    
+    // top-down scan
+    for (int i = 0; i < m.columns; i++) {
+        int curmax = -1;
+        for (int j = 0; j < m.rows; j++) {
+            if (get(&m, j, i) > curmax) {
+                set(&vis, j, i, 1);
+                curmax = get(&m, j, i);
+            }
+        }
+    }
+    // down-top scan
+    for (int i = 0; i < m.columns; i++) {
+        int curmax = -1;
+        for (int j = m.rows - 1; j >= 0; j--) {
+            if (get(&m, j, i) > curmax) {
+                set(&vis, j, i, 1);
+                curmax = get(&m, j, i);
+            }
+        }
+    }
+    
+    // left-right scan
+    for (int i = 0; i < m.rows; i++) {
+        int curmax = -1;
+        for (int j = 0; j < m.columns; j++) {
+            if (get(&m, i, j) > curmax) {
+                set(&vis, i, j, 1);
+                curmax = get(&m, i, j);
+            }
+        }
+    }
+    
+    // right-left scan
+    for (int i = 0; i < m.rows; i++) {
+        int curmax = -1;
+        for (int j = m.columns - 1; j >= 0; j--) {
+            if (get(&m, i, j) > curmax) {
+                set(&vis, i, j, 1);
+                curmax = get(&m, i, j);
+            }
+        }
+    }
+    
+    // count
+    int count = 0;
+    for (int i = 0; i < m.columns; i++) {
+        int curmax = -1;
+        for (int j = 0; j < m.rows; j++) {
+            if (get(&vis, j, i) > 0) {
+                count++;
+            }
+        }
+    }
+    
+    printf("%d", count);
+    return 0;
+}
+
diff --git a/advent-of-code/2022/08/2.c b/advent-of-code/2022/08/2.c
new file mode 100644
index 0000000..7cc8432
--- /dev/null
+++ b/advent-of-code/2022/08/2.c
@@ -0,0 +1,82 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct {
+    uint8_t *data;
+    int rows;
+    int columns;
+    int cap;
+} Mat;
+
+
+
+char buf[4096];
+
+int get(Mat *m, int row, int column) {
+    return m->data[row * m->columns + column];
+}
+
+int score(Mat *m, int i, int j) {
+    int height = get(m, i, j);
+    int s = 1;
+    int count = 0;
+    for (int p = i - 1; p >= 0; p--) {
+        count++;
+        if (get(m, p, j) >= height) break;
+    }
+    s *= count;
+    count = 0;
+    for (int p = i + 1; p < m->rows; p++) {
+        count++;
+        if (get(m, p, j) >= height) break;
+    }
+    s *= count;
+    count = 0;
+    for (int p = j - 1; p >= 0; p--) {
+        count++;
+        if (get(m, i, p) >= height) break;
+    }
+    s *= count;
+    count = 0;
+    for (int p = j + 1; p < m->columns; p++) {
+        count++;
+        if (get(m, i, p) >= height) break;
+    }
+    s *= count;
+    return s;
+}
+
+int main() {
+    Mat m;
+    m.data = malloc(4096);
+    m.cap = 4096;
+    m.rows = 0;
+    m.columns = 0;
+
+    FILE *fp = fopen("input", "r");
+    while(fgets(buf, 4096, fp)) {
+        int len = strlen(buf);
+        if (len <= 1) break;
+        if (m.columns == 0) m.columns = len - 1;
+        while (m.cap < (m.rows + 1) * m.columns) {
+            m.data = realloc(m.data, m.cap * 2);
+            m.cap *= 2;
+        }
+        memcpy(m.data + m.rows * m.columns, buf, m.columns);
+        m.rows++;
+    }
+
+    int maxscore = -1;
+    for (int i = 0; i < m.rows; i++) {
+        for (int j = 0; j < m.columns; j++) {
+            int s = score(&m, i, j);
+            if (s > maxscore) maxscore = s;
+        }
+    }
+
+    printf("%d", maxscore);
+    return 0;
+}
+
diff --git a/advent-of-code/2022/08/input b/advent-of-code/2022/08/input
new file mode 100644
index 0000000..e1d5896
--- /dev/null
+++ b/advent-of-code/2022/08/input
@@ -0,0 +1,100 @@
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+
diff --git a/advent-of-code/2022/09/1.c b/advent-of-code/2022/09/1.c
new file mode 100644
index 0000000..e23a089
--- /dev/null
+++ b/advent-of-code/2022/09/1.c
@@ -0,0 +1,91 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <htable.h>
+#include <crc32.h>
+
+typedef struct {
+    int x;
+    int y;
+} Point;
+
+uint32_t point_hash(void *point) {
+    return crc32(0, point, sizeof(Point));
+}
+
+bool point_eq(void *x, void *y) {
+    Point *a = x, *b = y;
+    return (a->x == b->x) && (a->y == b->y);
+}
+
+typedef struct {
+    Point head;
+    Point tail;
+} State;
+
+bool is_adjacent(Point p1, Point p2) {
+    if (abs(p1.x - p2.x) <= 1 && abs(p2.y - p1.y) <= 1) {
+        return true;
+    }
+    return false;
+}
+
+void run_impl(State *s, HTable *record, int dx, int dy) {
+    Point new = {s->head.x + dx, s->head.y + dy};
+    if (!is_adjacent(s->tail, new)) {
+        s->tail = s->head;
+        htable_insert(record , &(s->tail));
+    }
+    s->head = new;
+}
+
+void run(State *s, HTable *record, char direction, int step) {
+    int dx, dy;
+    switch (direction) {
+        case 'U':
+            dx = 0; dy = 1;
+            break;
+        case 'D':
+            dx = 0; dy = -1;
+            break;
+        case 'L':
+            dx = -1; dy = 0;
+            break;
+        case 'R':
+            dx = 1; dy = 0;
+            break;
+        default:
+            return;
+    }
+    for (int i = 0; i < step; i++) {
+        run_impl(s, record, dx, dy);
+    }
+}
+
+int count_htable(HTable *ht) {
+    int count = 0;
+    for (void *iter = htable_begin(ht);
+            iter != NULL;
+            iter = htable_next(ht, iter)) {
+        count++;
+    }
+    return count;
+}
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    State state;
+    state.head = (Point){0, 0};
+    state.tail = (Point){0, 0};
+    char direction;
+    int step;
+    HTable record;
+    htable_init(&record, sizeof(Point), -1, point_hash, point_eq);
+    while (fscanf(fp, "%c %d", &direction, &step) != EOF) {
+        run(&state, &record, direction, step);
+    }
+    int count = count_htable(&record);
+    printf("%d\n", count);
+    return 0;
+}
+
diff --git a/advent-of-code/2022/09/2.c b/advent-of-code/2022/09/2.c
new file mode 100644
index 0000000..7659e9b
--- /dev/null
+++ b/advent-of-code/2022/09/2.c
@@ -0,0 +1,106 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <htable.h>
+#include <crc32.h>
+
+typedef struct {
+    int x;
+    int y;
+} Point;
+
+uint32_t point_hash(void *point) {
+    return crc32(0, point, sizeof(Point));
+}
+
+bool point_eq(void *x, void *y) {
+    Point *a = x, *b = y;
+    return (a->x == b->x) && (a->y == b->y);
+}
+
+typedef struct {
+    Point knots[10];
+} State;
+
+bool is_adjacent(Point p1, Point p2) {
+    if (abs(p1.x - p2.x) <= 1 && abs(p2.y - p1.y) <= 1) {
+        return true;
+    }
+    return false;
+}
+
+Point catchup(Point prev, Point new) {
+    int dx = new.x - prev.x;
+    int dy = new.y - prev.y;
+    int cx = 0, cy = 0;
+    if (dx > 0) cx = 1;
+    if (dx < 0) cx = -1;
+    if (dy > 0) cy = 1;
+    if (dy < 0) cy = -1;
+    return (Point){prev.x + cx, prev.y + cy};
+}
+
+void run_impl(State *s, HTable *record, int dx, int dy) {
+    s->knots[0].x += dx;
+    s->knots[0].y += dy;
+    for (int i = 1; i < 10; i++) {
+        if (is_adjacent(s->knots[i], s->knots[i-1])) {
+            continue;
+        }
+        s->knots[i] = catchup(s->knots[i], s->knots[i-1]);
+        if (i == 9) {
+            htable_insert(record , &(s->knots[i]));
+        }
+    }
+}
+
+void run(State *s, HTable *record, char direction, int step) {
+    int dx, dy;
+    switch (direction) {
+        case 'U':
+            dx = 0; dy = 1;
+            break;
+        case 'D':
+            dx = 0; dy = -1;
+            break;
+        case 'L':
+            dx = -1; dy = 0;
+            break;
+        case 'R':
+            dx = 1; dy = 0;
+            break;
+        default:
+            return;
+    }
+    for (int i = 0; i < step; i++) {
+        run_impl(s, record, dx, dy);
+    }
+}
+
+int count_htable(HTable *ht) {
+    int count = 0;
+    for (void *iter = htable_begin(ht);
+            iter != NULL;
+            iter = htable_next(ht, iter)) {
+        Point *p = iter;
+        count++;
+    }
+    return count;
+}
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    State state = {0};
+    char direction;
+    int step;
+    HTable record;
+    htable_init(&record, sizeof(Point), -1, point_hash, point_eq);
+    htable_insert(&record, &state.knots[9]);
+    while (fscanf(fp, "%c %d", &direction, &step) != EOF) {
+        run(&state, &record, direction, step);
+    }
+    int count = count_htable(&record);
+    printf("%d\n", count);
+    return 0;
+}
+
diff --git a/advent-of-code/2022/09/Makefile b/advent-of-code/2022/09/Makefile
new file mode 100644
index 0000000..28d6768
--- /dev/null
+++ b/advent-of-code/2022/09/Makefile
@@ -0,0 +1,12 @@
+all: 1.out 2.out
+LIB=../lib/crc32.c ../lib/htable.c
+
+1.out: 1.c
+	cc -g -I../lib/ $< $(LIB) -o $@
+
+2.out: 2.c
+	cc -g -I../lib/ $< $(LIB) -o $@
+
+.PHONY: clean
+clean:
+	-rm *.out
diff --git a/advent-of-code/2022/09/input b/advent-of-code/2022/09/input
new file mode 100644
index 0000000..b272ede
--- /dev/null
+++ b/advent-of-code/2022/09/input
@@ -0,0 +1,2001 @@
+D 1
+L 2
+D 2
+L 1
+R 1
+D 1
+R 2
+U 1
+R 1
+D 2
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+R 3
+L 6
+U 12
+L 4
+D 13
+U 2
+L 4
+D 10
+R 16
+D 1
+U 1
+L 11
+D 8
+L 12
+R 8
+L 5
+R 1
+D 12
+R 2
+D 7
+U 16
+D 11
+L 15
+R 4
+U 4
+D 4
+U 4
+L 17
+U 3
+D 8
+U 1
+L 1
+U 4
+L 7
+U 9
+L 13
+D 10
+L 2
+U 7
+L 13
+D 16
+U 6
+L 10
+D 16
+L 8
+U 10
+L 6
+U 16
+L 5
+U 4
+R 9
+D 12
+R 1
+U 14
+L 14
+R 16
+D 5
+L 16
+R 14
+U 10
+R 4
+U 9
+L 15
+D 4
+U 15
+L 11
+R 14
+L 10
+D 14
+L 10
+D 12
+R 2
+D 3
+R 1
+U 1
+L 17
+U 9
+D 13
+R 7
+D 7
+U 13
+D 1
+R 14
+U 10
+R 16
+L 17
+R 7
+D 17
+U 11
+L 2
+U 16
+L 8
+U 13
+R 17
+U 5
+L 7
+R 3
+D 17
+L 10
+U 9
+D 16
+R 3
+U 5
+L 15
+R 16
+D 11
+U 9
+L 3
+R 14
+D 4
+L 4
+U 12
+D 9
+U 10
+D 15
+L 12
+R 6
+D 4
+L 14
+D 5
+L 4
+U 7
+R 15
+D 6
+L 15
+U 14
+D 10
+L 3
+D 9
+L 15
+R 9
+U 1
+L 4
+D 15
+U 12
+D 9
+R 8
+D 14
+R 15
+D 7
+U 18
+L 5
+U 6
+L 6
+D 10
+L 18
+R 3
+L 11
+D 10
+L 13
+U 13
+L 13
+R 3
+L 1
+U 3
+D 7
+L 9
+R 6
+U 18
+R 18
+U 15
+R 9
+U 4
+R 12
+L 12
+D 6
+U 10
+D 13
+L 6
+R 13
+L 13
+D 12
+U 4
+D 15
+L 12
+D 10
+U 12
+R 8
+L 13
+D 11
+L 13
+U 12
+D 5
+U 12
+R 10
+L 9
+U 13
+R 7
+D 2
+L 6
+U 13
+D 15
+R 3
+U 4
+D 5
+L 2
+D 10
+U 7
+L 2
+D 5
+L 5
+D 11
+R 5
+U 18
+L 9
+D 8
+U 12
+R 3
+U 8
+R 14
+D 1
+R 4
+L 5
+D 10
+R 18
+D 2
+R 9
+L 14
+U 4
+R 15
+D 4
+R 2
+L 4
+U 13
+R 6
+U 18
+D 4
+U 7
+L 15
+D 1
+L 6
+D 3
+U 15
+L 17
+U 15
+R 14
+L 9
+U 5
+L 4
+U 13
+R 5
+D 17
+U 17
+L 15
+U 14
+R 5
+L 1
+R 9
+U 8
+R 15
+U 18
+L 12
+R 13
+D 15
+R 5
+L 11
+R 5
+U 12
+R 8
+L 6
+R 1
+L 10
+U 17
+L 16
+U 12
+L 14
+D 16
+U 13
+D 18
+L 5
+U 16
+L 11
+D 15
+U 2
+L 9
+D 5
+L 17
+D 17
+L 4
+D 4
+L 19
+R 6
+D 6
+U 18
+R 16
+U 12
+D 2
+L 4
+U 19
+R 6
+U 1
+D 15
+R 13
+U 18
+D 12
+L 9
+U 1
+R 13
+D 18
+L 4
+D 17
+L 9
+D 8
+U 3
+D 5
+R 7
+L 16
+U 3
+L 1
+D 13
+R 17
+D 8
+R 9
+U 17
+L 2
+U 17
+D 16
+L 8
+R 9
+D 7
+L 16
+R 10
+L 16
+D 10
+L 15
+U 17
+L 2
+U 10
+D 16
+R 1
+L 2
+D 4
+R 13
+L 12
+D 8
+U 10
+L 6
+D 14
+L 6
+D 11
+R 1
+D 10
+L 18
+D 12
+R 14
+L 3
+D 7
+L 12
+R 19
+U 5
+R 19
+D 3
+L 15
+U 13
+
diff --git a/advent-of-code/2022/10/1.c b/advent-of-code/2022/10/1.c
new file mode 100644
index 0000000..12ddc22
--- /dev/null
+++ b/advent-of-code/2022/10/1.c
@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+#include <str.h>
+
+int strength = 1;
+int sum = 0;
+int time = 1;
+
+int process() {
+    if (time == 20 || time == 60 || time == 100
+            || time == 140 || time == 180 || time == 220) {
+        sum += strength * time;
+    }
+}
+
+void tick(int value) {
+    process();
+    time++;
+    strength += value;
+}
+
+int main() {
+    FILE *fp = fopen("input", "r");
+    while (true) {
+        char *rawline = fgetline(fp);
+        if (rawline == NULL) break;
+        char *line = str_strip(rawline);
+        free(rawline);
+        char** words = str_split(line, ' ');
+        if (words == NULL) {
+            free(line);
+            continue;
+        }
+        if (words[0] == NULL) {
+            free(line); free(words);
+            continue;
+        }
+        if (strcmp(words[0], "noop") == 0) {
+            tick(0);
+        } else if (strcmp(words[0], "addx") == 0) {
+            tick(0);
+            char *ptr;
+            int value = strtol(words[1], &ptr, 10);
+            tick(value);
+        }
+        str_list_free(words);
+        free(line);
+    }
+    printf("%d\n", sum);
+    return 0;
+}
diff --git a/advent-of-code/2022/10/2.c b/advent-of-code/2022/10/2.c
new file mode 100644
index 0000000..1abcb7e
--- /dev/null
+++ b/advent-of-code/2022/10/2.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+#include <str.h>
+
+char screen[6][40];
+
+int regx = 0;
+int time = 0;
+
+void process() {
+    if (time >= 240) return;
+    int delta = time % 40 - regx;
+    if (delta <= 2 && delta >= 0) {
+        screen[time / 40][time % 40] = '#';
+    }
+}
+
+void tick(int value) {
+    process();
+    time++;
+    regx += value;
+}
+
+int main() {
+    memset(screen, '.', 240);
+    FILE *fp = fopen("input", "r");
+    while (true) {
+        char *rawline = fgetline(fp);
+        if (rawline == NULL) break;
+        char *line = str_strip(rawline);
+        free(rawline);
+        char** words = str_split(line, ' ');
+        if (words == NULL) {
+            free(line);
+            continue;
+        }
+        if (words[0] == NULL) {
+            free(line); free(words);
+            continue;
+        }
+        if (strcmp(words[0], "noop") == 0) {
+            tick(0);
+        } else if (strcmp(words[0], "addx") == 0) {
+            tick(0);
+            char *ptr;
+            int value = strtol(words[1], &ptr, 10);
+            tick(value);
+        }
+        str_list_free(words);
+        free(line);
+    }
+    for (int i = 0; i < 6; i++) {
+        for (int j = 0; j < 40; j++) {
+            printf("%c", screen[i][j]);
+        }
+        printf("\n");
+    }
+    return 0;
+}
diff --git a/advent-of-code/2022/10/Makefile b/advent-of-code/2022/10/Makefile
new file mode 100644
index 0000000..baa0901
--- /dev/null
+++ b/advent-of-code/2022/10/Makefile
@@ -0,0 +1,12 @@
+all: 1.out 2.out
+LIB=../lib/str.c
+
+1.out: 1.c
+	cc -g -I../lib/ $< $(LIB) -o $@
+
+2.out: 2.c
+	cc -g -I../lib/ $< $(LIB) -o $@
+
+.PHONY: clean
+clean:
+	-rm *.out
diff --git a/advent-of-code/2022/10/input b/advent-of-code/2022/10/input
new file mode 100644
index 0000000..0464ea6
--- /dev/null
+++ b/advent-of-code/2022/10/input
@@ -0,0 +1,141 @@
+noop
+addx 25
+addx -5
+addx -14
+addx 4
+noop
+addx 2
+addx 3
+noop
+noop
+noop
+noop
+addx 3
+addx 5
+addx 2
+noop
+noop
+addx 5
+noop
+noop
+noop
+addx 1
+addx 2
+addx 5
+addx -40
+addx 5
+noop
+addx 26
+addx -20
+addx -3
+addx 2
+noop
+addx -4
+addx 9
+addx 5
+addx 2
+addx 11
+addx -10
+addx 2
+addx 5
+addx 2
+addx 5
+noop
+noop
+noop
+addx -31
+addx 32
+addx -37
+addx 1
+addx 8
+addx 13
+addx -15
+addx 4
+noop
+addx 5
+noop
+addx 3
+addx -2
+addx 4
+addx 1
+addx 4
+addx -14
+addx 15
+addx 4
+noop
+noop
+noop
+addx 3
+addx 5
+addx -40
+noop
+addx 5
+addx 8
+addx -3
+noop
+addx 2
+addx 9
+addx -4
+noop
+noop
+noop
+noop
+addx 5
+addx -9
+addx 10
+addx 4
+noop
+noop
+addx 5
+addx -19
+addx 24
+addx -2
+addx 5
+addx -40
+addx 22
+addx -19
+addx 2
+addx 5
+addx 2
+addx 5
+noop
+noop
+addx -2
+addx 2
+addx 5
+addx 3
+noop
+addx 2
+addx 2
+addx 3
+addx -2
+addx 10
+addx -3
+addx 3
+noop
+addx -40
+addx 2
+addx 11
+addx -5
+addx -1
+noop
+addx 3
+addx 7
+noop
+addx -2
+addx 5
+addx 2
+addx 3
+noop
+addx 2
+addx 6
+addx -5
+addx 2
+addx -18
+addx 26
+addx -1
+noop
+noop
+noop
+noop
+
diff --git a/advent-of-code/2022/LICENSE b/advent-of-code/2022/LICENSE
new file mode 100644
index 0000000..e25bcf3
--- /dev/null
+++ b/advent-of-code/2022/LICENSE
@@ -0,0 +1,16 @@
+Copyright (c) 2022, Dzshy <dzshy@outlook.com>
+
+Permission to use, copy, modify, and/or distribute this software for
+any purpose with or without fee is hereby granted, provided that the
+above copyright notice and this permission notice appear in all
+copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
+
diff --git a/advent-of-code/2022/README.md b/advent-of-code/2022/README.md
new file mode 100644
index 0000000..952d8df
--- /dev/null
+++ b/advent-of-code/2022/README.md
@@ -0,0 +1,2 @@
+
+My solutions for [Advent of Code 2022](https://adventofcode.com/2022).
diff --git a/advent-of-code/2022/lib/crc32.c b/advent-of-code/2022/lib/crc32.c
new file mode 100644
index 0000000..c97a971
--- /dev/null
+++ b/advent-of-code/2022/lib/crc32.c
@@ -0,0 +1,55 @@
+#include "crc32.h"
+
+const uint32_t crc32_tab[] = {
+    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
+    0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+    0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+    0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+    0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+    0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+    0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
+    0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+    0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+    0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+    0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
+    0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+    0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
+    0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+    0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+    0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+    0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
+    0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+    0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
+    0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+    0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+    0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
+    0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+    0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+    0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+    0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+    0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+    0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
+    0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+    0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
+    0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+    0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+    0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+    0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+    0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+    0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
+    0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+    0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+    0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
+    0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+    0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
+};
+
+uint32_t crc32(uint32_t crc, void *buf, int size){
+    uint8_t *p = buf;
+    crc = ~crc;
+    while (size--)
+        crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
+    return ~crc;
+}
diff --git a/advent-of-code/2022/lib/crc32.h b/advent-of-code/2022/lib/crc32.h
new file mode 100644
index 0000000..86587f1
--- /dev/null
+++ b/advent-of-code/2022/lib/crc32.h
@@ -0,0 +1,9 @@
+#ifndef CRC32_H_
+#define CRC32_H_
+
+#include <stdint.h>
+
+uint32_t crc32(uint32_t r, void* buf, int size);
+
+#endif
+
diff --git a/advent-of-code/2022/lib/htable.c b/advent-of-code/2022/lib/htable.c
new file mode 100644
index 0000000..d4b90a5
--- /dev/null
+++ b/advent-of-code/2022/lib/htable.c
@@ -0,0 +1,106 @@
+#include "htable.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#define HTFL_NUL 0
+#define HTFL_VAL 1
+#define HTFL_DEL 2
+
+static void* htable_end(HTable *ht) {
+    return ht->buf + ht->cap * (ht->elemsz + 1);
+}
+
+static void rebuild(HTable *ht) {
+    HTable newht;
+    htable_init(&newht, ht->elemsz, ht->size * 6, ht->hash, ht->eq);
+    void *iter = htable_begin(ht);
+    while (iter != NULL) {
+        htable_insert(&newht, iter);
+        iter = htable_next(ht, iter);
+    }
+    free(ht->buf);
+    *ht = newht;
+}
+
+static uint8_t getflag(void *iter) {
+    return *(uint8_t*)(iter - 1);
+}
+
+static void setflag(void *iter, uint8_t flag) {
+    *(uint8_t *)(iter - 1) = flag;
+}
+
+void htable_init(HTable *ht, int elemsz, int cap, uint32_t (*hash)(void*),
+                 bool (*eq)(void*, void*)) {
+    if (cap < 16) cap = 16;
+    ht->buf = malloc(cap * (elemsz + 1));
+    memset(ht->buf, 0, cap * (elemsz + 1));
+    ht->size = 0;
+    ht->cap = cap;
+    ht->taken = 0;
+    ht->begin = NULL;
+    ht->elemsz = elemsz;
+    ht->hash = hash;
+    ht->eq = eq;
+}
+
+bool htable_insert(HTable *ht, void* elem) {
+    if (ht->taken + 1 > ht->cap / 2) {
+        rebuild(ht);
+    }
+    ht->taken++;
+    ht->size++;
+    int hashcode = ht->hash(elem) % ht->cap;
+    void *pos = ht->buf + hashcode * (ht->elemsz + 1) + 1;
+    while (getflag(pos) != HTFL_NUL) {
+        if (getflag(pos) == HTFL_VAL && ht->eq(pos, elem)) return false;
+        pos += ht->elemsz + 1;
+        if (pos >= htable_end(ht)) { // arrived end, restart from beginning
+            pos = ht->buf + 1;
+        }
+    }
+    memcpy(pos, elem, ht->elemsz);
+    setflag(pos, HTFL_VAL);
+    if (pos < ht->begin || ht->begin == NULL) {
+        ht->begin = pos;
+    }
+    return true;
+}
+
+void htable_del(HTable *ht, void* iter) {
+    ht->size--;
+    setflag(iter, HTFL_DEL);
+    if (iter == ht->begin) {
+        ht->begin = htable_next(ht, iter);
+    }
+}
+
+void* htable_find(HTable *ht, void* elem) {
+    int hashcode = ht->hash(elem) % ht->cap;
+    void *pos = ht->buf + hashcode * (ht->elemsz + 1) + 1;
+    while (getflag(pos) != HTFL_NUL) {
+        if (getflag(pos) == HTFL_VAL && ht->eq(pos, elem)) return pos;
+        pos += ht->elemsz + 1;
+        if (pos >= htable_end(ht)) { // arrived end, restart from beginning
+            pos = ht->buf + 1;
+        }
+    }
+    return NULL;
+}
+
+void* htable_begin(HTable *ht) {
+    return ht->begin;
+}
+
+void* htable_next(HTable *ht, void *iter) {
+    void *pos = iter;
+    do {
+        pos += ht->elemsz + 1;
+        if (pos >= htable_end(ht)) { 
+            return NULL;
+        }
+    } while (getflag(pos) != HTFL_VAL);
+    return pos;
+}
+
diff --git a/advent-of-code/2022/lib/htable.h b/advent-of-code/2022/lib/htable.h
new file mode 100644
index 0000000..3bde74f
--- /dev/null
+++ b/advent-of-code/2022/lib/htable.h
@@ -0,0 +1,29 @@
+#ifndef HTABLE_H_
+#define HTABLE_H_
+
+#include <stdbool.h>
+#include <stdint.h>
+
+typedef struct {
+    void *buf;
+    int size;
+    int cap;
+    int taken;
+    void* begin;
+    int elemsz;
+    uint32_t (*hash)(void*);
+    bool (*eq)(void*, void*);
+} HTable;
+
+void htable_init(HTable *ht, int elemsz, int cap, uint32_t (*hash)(void*),
+                 bool (*eq)(void*, void*));
+bool htable_insert(HTable *ht, void* elem);
+void htable_del(HTable *ht, void* iter);
+
+// return a iterator
+void* htable_find(HTable *ht, void* elem);
+void* htable_begin(HTable *ht);
+void* htable_next(HTable *ht, void *iter);
+
+#endif
+
diff --git a/advent-of-code/2022/lib/pque.c b/advent-of-code/2022/lib/pque.c
new file mode 100644
index 0000000..0a9dbc0
--- /dev/null
+++ b/advent-of-code/2022/lib/pque.c
@@ -0,0 +1,72 @@
+#include "pque.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+void pq_init(PQue *pq, int cap, int elem_sz, int (*cmp)(void*, void*)) {
+    pq->cap = cap;
+    pq->size = 0;
+    pq->elemsz = elem_sz;
+    pq->cmp = cmp;
+    pq->buf = malloc(cap * elem_sz);
+}
+
+static void swap(PQue *pq, int a, int b) {
+    char buf[pq->elemsz];
+    void *tmp = buf;
+    int elemsz = pq->elemsz;
+    memcpy(tmp, pq->buf + a*elemsz, elemsz);
+    memcpy(pq->buf + a*elemsz, pq->buf + b*elemsz, elemsz);
+    memcpy(pq->buf + b*elemsz, tmp, elemsz);
+}
+
+static int cmp(PQue *pq, int a, int b) {
+    return pq->cmp(pq->buf + a*pq->elemsz, pq->buf + b*pq->elemsz);
+}
+
+void pq_push(PQue *pq, void *elem) {
+    if (pq->size + 1 > pq->cap) {
+        pq->buf = realloc(pq->buf, 2 * pq->cap * pq->elemsz);
+        pq->cap *= 2;
+    }
+    memcpy(pq->buf + pq->size*pq->elemsz, elem, pq->elemsz);
+    pq->size++;
+    if (pq->size == 0) {
+        return;
+    }
+    int i = pq->size - 1;
+    while (i > 0 && cmp(pq, i, i/2) > 0) {
+        swap(pq, i, i/2);
+        i /= 2;
+    }
+}
+
+static void heapify(PQue *pq, int idx) {
+    int left, right, largest;
+    left = 2 * idx +1;
+    right = 2 * idx + 2;
+    if (left < pq->size && cmp(pq, left, idx) > 0) {
+        largest = left;
+    } else {
+        largest = idx;
+    }
+    if (right < pq->size && cmp(pq, right, largest) > 0) {
+        largest = right;
+    }
+    if (largest != idx) {
+        swap(pq, largest, idx);
+        heapify(pq, largest);
+    }
+}
+
+void pq_pop(PQue *pq) {
+    if (pq->size == 0) return;
+    memcpy(pq->buf, pq->buf+(pq->size - 1)*pq->elemsz, pq->elemsz);
+    pq->size -= 1;
+    heapify(pq, 0);
+}
+
+void* pq_top(PQue *pq) {
+    if (pq->size == 0) return NULL;
+    return pq->buf;
+}
diff --git a/advent-of-code/2022/lib/pque.h b/advent-of-code/2022/lib/pque.h
new file mode 100644
index 0000000..0d86560
--- /dev/null
+++ b/advent-of-code/2022/lib/pque.h
@@ -0,0 +1,18 @@
+#ifndef PQUEUE_H_
+#define PQUEUE_H_
+
+typedef struct {
+    void *buf;
+    int elemsz;
+    int cap;
+    int size;
+    int (*cmp)(void*, void*);
+} PQue;
+
+void pq_init(PQue *pq, int cap, int elemsz, int (*cmp)(void*, void*));
+void pq_push(PQue *pq, void *elem);
+void pq_pop(PQue *pq);
+void* pq_top();
+
+#endif
+
diff --git a/advent-of-code/2022/lib/rbtree.c b/advent-of-code/2022/lib/rbtree.c
new file mode 100644
index 0000000..25a951b
--- /dev/null
+++ b/advent-of-code/2022/lib/rbtree.c
@@ -0,0 +1,396 @@
+/*	$OpenBSD: tree.h,v 1.30 2020/10/10 18:03:41 otto Exp $	*/
+/*
+ * Copyright 2002 Niels Provos <provos@citi.umich.edu>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "rbtree.h"
+
+#define RED   1
+#define BLACK 0
+
+static struct rbnode *rbtree_minmax(struct rbtree *, int);
+void* rbtree_min(struct rbtree *head) {
+    return rbtree_minmax(head, -1);
+}
+void* rbtree_max(struct rbtree *head) {
+    return rbtree_minmax(head, 1);
+}
+
+void* rbtree_left(void *node) {
+    struct rbnode *elm = node;
+    if (node == NULL) return NULL;
+    return elm->entry.rbe_left;
+}
+void* rbtree_right(void *node) {
+    struct rbnode *elm = node;
+    if (node == NULL) return NULL;
+    return elm->entry.rbe_right;
+}
+void* rbtree_parent(void *node) {
+    struct rbnode *elm = node;
+    if (node == NULL) return NULL;
+    return elm->entry.rbe_parent;
+}
+
+static void augment(struct rbtree * head, struct rbnode *elm) {
+    if (head->augment != NULL) head->augment(elm);
+}
+
+static void rbtree_insert_color(struct rbtree *head, struct rbnode *elm);
+static void rbtree_remove_color(struct rbtree *head, struct rbnode *parent,
+                                struct rbnode *elm);
+
+static void rotate_left(struct rbtree *head, struct rbnode *elm) {
+    struct rbnode *tmp = elm->entry.rbe_right;
+    if ((elm->entry.rbe_right = tmp->entry.rbe_left)) {
+        tmp->entry.rbe_left->entry.rbe_parent = elm;
+    }
+    augment(head, elm);
+    if ((tmp->entry.rbe_parent = elm->entry.rbe_parent)) {
+        if (elm == elm->entry.rbe_parent->entry.rbe_left)
+          elm->entry.rbe_parent->entry.rbe_left = tmp;
+        else
+          elm->entry.rbe_parent->entry.rbe_right = tmp;
+    } else {
+        head->rbh_root = tmp;
+    }
+    tmp->entry.rbe_left = elm;
+    elm->entry.rbe_parent = tmp;
+    augment(head, tmp);
+    if (tmp->entry.rbe_parent) {
+        augment(head, tmp->entry.rbe_parent);
+    }
+}
+
+static void rotate_right(struct rbtree *head, struct rbnode *elm) {
+    struct rbnode *tmp = elm->entry.rbe_left;
+    if ((elm->entry.rbe_left = tmp->entry.rbe_right)) {
+        tmp->entry.rbe_right->entry.rbe_parent = elm;
+    }
+    augment(head, elm);
+    if ((tmp->entry.rbe_parent = elm->entry.rbe_parent)) {
+        if (elm == elm->entry.rbe_parent->entry.rbe_left)
+          elm->entry.rbe_parent->entry.rbe_left = tmp;
+        else
+          elm->entry.rbe_parent->entry.rbe_right = tmp;
+    } else {
+        head->rbh_root = tmp;
+    }
+    tmp->entry.rbe_right = elm;
+    elm->entry.rbe_parent = tmp;
+    augment(head, tmp);
+    if (tmp->entry.rbe_parent) {
+        augment(head, tmp->entry.rbe_parent);
+    }
+}
+
+static void rbtree_insert_color(struct rbtree *head, struct rbnode *elm) {
+  struct rbnode *parent, *gparent, *tmp;
+  while ((parent = elm->entry.rbe_parent) && parent->entry.rbe_color == 1) {
+    gparent = parent->entry.rbe_parent;
+    if (parent == gparent->entry.rbe_left) {
+      tmp = gparent->entry.rbe_right;
+      if (tmp && tmp->entry.rbe_color == 1) {
+        tmp->entry.rbe_color = BLACK;
+        parent->entry.rbe_color = BLACK;
+        gparent->entry.rbe_color = RED;
+        elm = gparent;
+        continue;
+      }
+      if (parent->entry.rbe_right == elm) {
+        rotate_left(head, parent);
+        tmp = parent;
+        parent = elm;
+        elm = tmp;
+      }
+      parent->entry.rbe_color = BLACK;
+      gparent->entry.rbe_color = RED;
+      rotate_right(head, gparent);
+    } else {
+      tmp = gparent->entry.rbe_left;
+      if (tmp && tmp->entry.rbe_color == 1) {
+        tmp->entry.rbe_color = BLACK;
+        parent->entry.rbe_color = BLACK;
+        gparent->entry.rbe_color = RED;;
+        elm = gparent;
+        continue;
+      }
+      if (parent->entry.rbe_left == elm) {
+        rotate_right(head, parent);
+        tmp = parent;
+        parent = elm;
+        elm = tmp;
+      }
+      parent->entry.rbe_color = BLACK;
+      gparent->entry.rbe_color = RED;
+      rotate_left(head, gparent);
+    }
+  }
+  head->rbh_root->entry.rbe_color = BLACK;
+}
+
+static void rbtree_remove_color(struct rbtree *head, struct rbnode *parent,
+                            struct rbnode *elm) {
+  struct rbnode *tmp;
+  while ((elm == NULL || elm->entry.rbe_color == 0) &&
+         elm != head->rbh_root) {
+    if (parent->entry.rbe_left == elm) {
+      tmp = parent->entry.rbe_right;
+      if (tmp->entry.rbe_color == 1) {
+        tmp->entry.rbe_color = BLACK;
+        parent->entry.rbe_color = RED;
+        rotate_left(head, parent);
+        tmp = parent->entry.rbe_right;
+      }
+      if ((tmp->entry.rbe_left == NULL ||
+           tmp->entry.rbe_left->entry.rbe_color == 0) &&
+          (tmp->entry.rbe_right == NULL ||
+           tmp->entry.rbe_right->entry.rbe_color == 0)) {
+        tmp->entry.rbe_color = RED;
+        elm = parent;
+        parent = elm->entry.rbe_parent;
+      } else {
+        if (tmp->entry.rbe_right == NULL ||
+            tmp->entry.rbe_right->entry.rbe_color == 0) {
+          struct rbnode *oleft;
+          if ((oleft = tmp->entry.rbe_left))
+            oleft->entry.rbe_color = BLACK;
+          tmp->entry.rbe_color = RED;
+          rotate_right(head, tmp);
+          tmp = parent->entry.rbe_right;
+        }
+        tmp->entry.rbe_color = parent->entry.rbe_color;
+        parent->entry.rbe_color = BLACK;
+        if (tmp->entry.rbe_right)
+          tmp->entry.rbe_right->entry.rbe_color = BLACK;
+        rotate_left(head, parent);
+        elm = head->rbh_root;
+        break;
+      }
+    } else {
+      tmp = parent->entry.rbe_left;
+      if (tmp->entry.rbe_color == 1) {
+        tmp->entry.rbe_color = BLACK;
+        parent->entry.rbe_color = RED;
+        rotate_right(head, parent);
+        tmp = parent->entry.rbe_left;
+      }
+      if ((tmp->entry.rbe_left == NULL ||
+           tmp->entry.rbe_left->entry.rbe_color == 0) &&
+          (tmp->entry.rbe_right == NULL ||
+           tmp->entry.rbe_right->entry.rbe_color == 0)) {
+        tmp->entry.rbe_color = RED;
+        elm = parent;
+        parent = elm->entry.rbe_parent;
+      } else {
+        if (tmp->entry.rbe_left == NULL ||
+            tmp->entry.rbe_left->entry.rbe_color == 0) {
+          struct rbnode *oright;
+          if ((oright = tmp->entry.rbe_right))
+            oright->entry.rbe_color = BLACK;
+          tmp->entry.rbe_color = RED;
+          rotate_left(head, tmp);
+          tmp = parent->entry.rbe_left;
+        }
+        tmp->entry.rbe_color = parent->entry.rbe_color;
+        parent->entry.rbe_color = BLACK;
+        if (tmp->entry.rbe_left)
+          tmp->entry.rbe_left->entry.rbe_color = BLACK;
+        rotate_right(head, parent);
+        elm = head->rbh_root;
+        break;
+      }
+    }
+  }
+  if (elm)
+    elm->entry.rbe_color = BLACK;
+}
+
+void rbtree_remove(struct rbtree *head, void* elmv) {
+  struct rbnode *elm = elmv;
+  struct rbnode *child, *parent;
+  int color;
+  if (elm->entry.rbe_left == NULL)
+    child = elm->entry.rbe_right;
+  else if (elm->entry.rbe_right == NULL)
+    child = elm->entry.rbe_left;
+  else {
+    struct rbnode *old = elm, *left;
+    elm = elm->entry.rbe_right;
+    while ((left = elm->entry.rbe_left))
+      elm = left;
+    child = elm->entry.rbe_right;
+    parent = elm->entry.rbe_parent;
+    color = elm->entry.rbe_color;
+    if (child)
+      child->entry.rbe_parent = parent;
+    if (parent) {
+      if (parent->entry.rbe_left == elm)
+        parent->entry.rbe_left = child;
+      else
+        parent->entry.rbe_right = child;
+      augment(head, parent);
+    } else
+      head->rbh_root = child;
+    if (elm->entry.rbe_parent == old)
+      parent = elm;
+    elm->entry = old->entry;
+    if (old->entry.rbe_parent) {
+      if ((old->entry.rbe_parent)->entry.rbe_left == old)
+        (old->entry.rbe_parent)->entry.rbe_left = elm;
+      else
+        (old->entry.rbe_parent)->entry.rbe_right = elm;
+      augment(head, old->entry.rbe_parent);
+    } else
+      head->rbh_root = elm;
+    old->entry.rbe_left->entry.rbe_parent = elm;
+    if (old->entry.rbe_right)
+      old->entry.rbe_right->entry.rbe_parent = elm;
+    if (parent) {
+      left = parent;
+      if (head->augment != NULL) {
+          do {
+              augment(head, left);
+          } while ((left = left->entry.rbe_parent));
+      }
+    }
+    goto color;
+  }
+  parent = elm->entry.rbe_parent;
+  color = elm->entry.rbe_color;
+  if (child)
+    child->entry.rbe_parent = parent;
+  if (parent) {
+    if (parent->entry.rbe_left == elm)
+      parent->entry.rbe_left = child;
+    else
+      parent->entry.rbe_right = child;
+    struct rbnode* goback = parent;
+    if (head->augment != NULL) {
+        do {
+            augment(head, goback);
+        } while ((goback = goback->entry.rbe_parent));
+    }
+  } else
+    head->rbh_root = child;
+color:
+  if (color == 0)
+    rbtree_remove_color(head, parent, child);
+}
+
+void* rbtree_insert(struct rbtree *head, void *elmv) {
+  struct rbnode *elm = elmv;
+  struct rbnode *tmp;
+  struct rbnode *parent = NULL;
+  int comp = 0;
+  tmp = head->rbh_root;
+  while (tmp) {
+    parent = tmp;
+    comp = head->cmp((void*)elm->content, (void*)parent->content);
+    if (comp < 0)
+      tmp = tmp->entry.rbe_left;
+    else if (comp > 0)
+      tmp = tmp->entry.rbe_right;
+    else
+      return tmp;
+  }
+  elm->entry.rbe_parent = parent;
+  elm->entry.rbe_left = elm->entry.rbe_right = NULL;
+  elm->entry.rbe_color = RED;
+  if (parent != NULL) {
+    if (comp < 0)
+      parent->entry.rbe_left = elm;
+    else
+      parent->entry.rbe_right = elm;
+    struct rbnode* goback = parent;
+    if (head->augment != NULL) {
+        do {
+            augment(head, goback);
+        } while ((goback = goback->entry.rbe_parent));
+    }
+  } else
+    head->rbh_root = elm;
+  rbtree_insert_color(head, elm);
+  return (NULL);
+}
+
+void* rbtree_find(struct rbtree *head, void *key) {
+  struct rbnode *tmp = head->rbh_root;
+  int comp;
+  while (tmp) {
+    comp = head->cmp(key, (void*)tmp->content);
+    if (comp < 0)
+      tmp = tmp->entry.rbe_left;
+    else if (comp > 0)
+      tmp = tmp->entry.rbe_right;
+    else
+      return tmp;
+  }
+  return (NULL);
+}
+
+void* rbtree_next(struct rbtree *head, void *elmv) {
+  struct rbnode *elm = elmv;
+  if (elm->entry.rbe_right) {
+    elm = elm->entry.rbe_right;
+    while (elm->entry.rbe_left)
+      elm = elm->entry.rbe_left;
+  } else {
+    if (elm->entry.rbe_parent &&
+        (elm == (elm->entry.rbe_parent)->entry.rbe_left))
+      elm = elm->entry.rbe_parent;
+    else {
+      while (elm->entry.rbe_parent &&
+             (elm == (elm->entry.rbe_parent)->entry.rbe_right))
+        elm = elm->entry.rbe_parent;
+      elm = elm->entry.rbe_parent;
+    }
+  }
+  return elm;
+}
+
+static struct rbnode *rbtree_minmax(struct rbtree *head, int val) {
+  struct rbnode *tmp = head->rbh_root;
+  struct rbnode *parent = NULL;
+  while (tmp) {
+    parent = tmp;
+    if (val < 0)
+      tmp = tmp->entry.rbe_left;
+    else
+      tmp = tmp->entry.rbe_right;
+  }
+  return parent;
+};
+
+static void rbtree_free_impl(struct rbnode *node, void (*free_cb)(void*)) {
+  if (node == NULL) return;
+  if (free_cb != NULL) free_cb(node->content);
+  rbtree_free_impl(node->entry.rbe_left, free_cb);
+  rbtree_free_impl(node->entry.rbe_right, free_cb);
+  free(node);
+}
+
+void rbtree_free(struct rbtree *head, void (*free_cb)(void*)) {
+  rbtree_free_impl(head->rbh_root, free_cb);  
+}
diff --git a/advent-of-code/2022/lib/rbtree.h b/advent-of-code/2022/lib/rbtree.h
new file mode 100644
index 0000000..4255e84
--- /dev/null
+++ b/advent-of-code/2022/lib/rbtree.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2002 Niels Provos <provos@citi.umich.edu>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdlib.h>
+
+struct rbnode {
+  struct {
+    struct rbnode *rbe_left;
+    struct rbnode *rbe_right;
+    struct rbnode *rbe_parent;
+    int rbe_color;
+  } entry;
+  char content[0];
+};
+
+struct rbtree {
+  struct rbnode *rbh_root;
+  int (*cmp)(void *k1, void *k2);
+  void (*augment)(void *elm);
+};
+
+typedef struct rbnode RbNode;
+typedef struct rbtree RbTree;
+
+void rbtree_remove(struct rbtree *, void* iter);
+
+// return a iterator
+void* rbtree_insert(struct rbtree *, void *treenode);
+void* rbtree_find(struct rbtree *, void *val);
+void* rbtree_next(struct rbtree *, void* iter);
+void* rbtree_min(struct rbtree *);
+void* rbtree_max(struct rbtree *);
+void* rbtree_left(void *node);
+void* rbtree_right(void *node);
+void* rbtree_parent(void *node);
+
+void rbtree_free(struct rbtree *, void (*free_cb)(void*));
diff --git a/advent-of-code/2022/lib/str.c b/advent-of-code/2022/lib/str.c
new file mode 100644
index 0000000..16968a2
--- /dev/null
+++ b/advent-of-code/2022/lib/str.c
@@ -0,0 +1,130 @@
+#include "str.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include <ctype.h>
+
+char** str_split(char *str, char delim) {
+    char **ret;
+
+    if (str == NULL) return NULL;
+    if (*str == '\n') {
+        ret = malloc(sizeof(char*));
+        *ret = NULL;
+        return ret;
+    }
+    int count = 0;
+    char *begin = str;
+    for (char *p = str; *p != '\0'; p++) {
+        if (*p != delim && !(delim == '\0' && isspace(*p))) {
+            continue;
+        }
+        int size = p - begin;
+        if (size > 0) count++;
+    }
+    count++;
+    ret = malloc((count + 1) * sizeof(char*));
+    memset(ret, 0, (count + 1) * sizeof(char*));
+
+    begin = str;
+    int i = 0;
+    bool finished = false;
+    for (char *p = str; !finished; p++) {
+        if (*p == '\0') finished = true;
+        if (*p != delim && *p != '\0' && !(delim == '\0' && isspace(*p))) {
+            continue;
+        }
+        int size = p - begin;
+        if (size == 0) {
+            begin = p + 1;
+            continue;
+        }
+        char *buf = malloc(sizeof(char) * (size + 1));
+        buf[size] = '\0';
+        memcpy(buf, begin, size * sizeof(char));
+        begin = p + 1;
+        ret[i] = buf;
+        i++;
+    }
+    return ret;
+}
+
+void str_list_free(char **list) {
+    char **p = list;
+    while (*p != NULL) {
+        free(*p);
+        p++;
+    }
+    free(list);
+}
+
+char* str_strip(char *str) {
+    int len = strlen(str);
+    char *begin = str;
+    char *end = str + len - 1;
+    while (isspace(*begin) && begin < end) {
+        begin++;
+    }
+    while (isspace(*end) && end >= begin) {
+        end--;
+    }
+    len = end - begin + 1;
+    char *buf = malloc(sizeof(char) * (len) + 1);
+    buf[len] = '\0';
+    memcpy(buf, begin, len);
+    return buf;
+}
+
+void sb_init(StrBuilder *sb) {
+    *sb = (StrBuilder){.size = 0, .cap = 16};
+    sb->buf = malloc(sizeof(char) * 17);
+}
+
+static void sb_reserve(StrBuilder *sb, int extra) {
+    if (sb->size + extra <= sb->cap) {
+        return;
+    }
+    int new_cap = (sb->size + extra) * 2;
+    sb->buf = realloc(sb->buf, new_cap + 1);
+    memset(sb->buf + sb->cap, 0, new_cap - sb->cap + 1);
+    sb->cap = new_cap;
+}
+
+void sb_append(StrBuilder *sb, char *format, ...) {
+    va_list va1;
+    va_list va2;
+    va_start(va1, format);
+    va_copy(va2, va1);
+    int size = vsnprintf(NULL, 0, format, va1);
+    sb_reserve(sb, size);
+    vsnprintf(sb->buf + sb->size, sb->cap - sb->size + 1, format, va2);
+}
+
+void sb_appendc(StrBuilder *sb, char c) {
+    sb_reserve(sb, 1);
+    sb->buf[sb->size] = c;
+    sb->size++;
+}
+
+char* fgetline(FILE *fp) {
+    StrBuilder sb;
+    sb_init(&sb);
+    while (true) {
+        int c = fgetc(fp);
+        if (c == EOF && sb.size == 0) return NULL;
+        if (c != EOF) sb_appendc(&sb, c);
+        if (c == EOF || c == '\n') return sb.buf;
+    }
+    return NULL;
+}
+
+int fpeek(FILE *fp) {
+    int c = fgetc(fp);
+    if (c == EOF) return c;
+    ungetc(c, fp);
+    return c;
+}
diff --git a/advent-of-code/2022/lib/str.h b/advent-of-code/2022/lib/str.h
new file mode 100644
index 0000000..414adaa
--- /dev/null
+++ b/advent-of-code/2022/lib/str.h
@@ -0,0 +1,24 @@
+#ifndef NEBUTIL_STR_H_
+#define NEBUTIL_STR_H_
+
+#include <stdio.h>
+
+char* str_strip(char *str);
+char** str_split(char *str, char delim);
+void str_list_free(char **list);
+
+typedef struct {
+    char *buf;
+    int size;
+    int cap;
+} StrBuilder;
+
+void sb_init(StrBuilder *sb);
+void sb_append(StrBuilder *sb, char *format, ...);
+void sb_appendc(StrBuilder *sb, char c);
+
+char* fgetline(FILE* fp);
+int   fpeek(FILE *fp);
+
+#endif
+