1 files changed, 26 insertions, 0 deletions
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;
+}