From 5eb6bd32ca4102bf29c7fabd26984c1c7c351c1e Mon Sep 17 00:00:00 2001
From: Mistivia <i@mistivia.com>
Date: Sun, 21 Dec 2025 21:26:24 +0800
Subject: day 5 part1

---
 05/Makefile |  13 ++++++
 05/part1.c  | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 05/part2.c  |   0
 3 files changed, 149 insertions(+)
 create mode 100644 05/Makefile
 create mode 100644 05/part1.c
 create mode 100644 05/part2.c

diff --git a/05/Makefile b/05/Makefile
new file mode 100644
index 0000000..a8f700f
--- /dev/null
+++ b/05/Makefile
@@ -0,0 +1,13 @@
+all: part1 part2
+
+part1: part1.c
+	gcc -g part1.c -o part1 -lalgds
+
+part2: part2.c
+	gcc -g part2.c -o part2 -lalgds
+
+1: part1
+	cat input | ./part1
+
+2: part2
+	cat input | ./part2
\ No newline at end of file
diff --git a/05/part1.c b/05/part1.c
new file mode 100644
index 0000000..0ad59b8
--- /dev/null
+++ b/05/part1.c
@@ -0,0 +1,136 @@
+#include <ctype.h>
+#include <stdio.h>
+#include <assert.h>
+#include <errno.h>
+
+#include <algds/vec.h>
+#include <algds/str.h>
+
+#define PANIC do { \
+    fprintf(stderr, "panic at %s:%d\n", __FILE__, __LINE__); \
+    abort(); \
+} while (0)
+
+void expect_char(char e) {
+    int c = fpeek(stdin);
+    if (c != e) {
+        PANIC;
+    }
+    fgetc(stdin);
+}
+
+void skip_space() {
+    while (1) {
+        int c = fpeek(stdin);
+        if (c == EOF) return;
+        if (isspace(c)) {
+            fgetc(stdin);
+        } else {
+            return;
+        }
+    }
+}
+
+bool string2long(const char *s, long *num) {
+    char *end;
+    errno = 0;
+    *num = strtol(s, &end, 10);
+    if (end == s) {
+        return false;
+    }
+    if (errno != 0) {
+        return false;
+    }
+    return true;
+}
+
+int64_t parse_integer() {
+    long ret;
+    StrBuilder sb;
+    StrBuilder_init(&sb);
+    while (1) {
+        int c = fpeek(stdin);
+        if (isdigit(c)) {
+            fgetc(stdin);
+            StrBuilder_append_char(&sb, c);
+        } else {
+            break;
+        }
+    }
+    if (strlen(sb.buf) == 0) {
+        PANIC;
+    }
+    StrBuilder_append_char(&sb, '\0');
+    if (!string2long(sb.buf, &ret)) {
+        PANIC;
+    }
+    free(sb.buf);
+    return ret;
+}
+
+typedef struct {
+    int64_t start;
+    int64_t end;
+} Range;
+
+void Range_show(Range self, FILE *fp) {
+    fprintf(fp, "%ld-%ld", self.start, self.end);
+}
+
+VECTOR_DEF(Range)
+VECTOR_IMPL(Range)
+
+Range parse_range() {
+    Range ret;
+    ret.start = parse_integer();
+    expect_char('-');
+    ret.end = parse_integer();
+    expect_char('\n');
+    return ret;
+}
+
+int main() {
+    RangeVector ranges;
+    RangeVector_init(&ranges);
+    int c;
+    while (1) {
+        c = fpeek(stdin);
+        if (c == '\n') {
+            break;
+        } else if (isdigit(c)) {
+            Range r = parse_range();
+            RangeVector_push_back(&ranges, r);
+        } else {
+            PANIC;
+        }
+    }
+    expect_char('\n');
+    LongVector ids;
+    LongVector_init(&ids);
+    while (1) {
+        c = fpeek(stdin);
+        if (isdigit(c)) {
+            long id = parse_integer();
+            LongVector_push_back(&ids, id);
+            c = fpeek(stdin);
+            if (c == EOF) break;
+            expect_char('\n');
+        }
+    }
+    int count = 0;
+    for (int i = 0; i < LongVector_len(&ids); i++) {
+        long n = ids.buffer[i];
+        for (int j = 0; j < RangeVector_len(&ranges); j++) {
+            Range r = ranges.buffer[j];
+            if (n >= r.start && n <= r.end) {
+                count++;
+                break;
+            }
+        }
+    }
+    printf("%d\n", count);
+
+    RangeVector_free(&ranges);
+    LongVector_free(&ids);
+    return 0;
+}
\ No newline at end of file
diff --git a/05/part2.c b/05/part2.c
new file mode 100644
index 0000000..e69de29
-- 
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