1 files changed, 30 insertions, 0 deletions
diff --git a/advent-of-code/2023/01/part1.c b/advent-of-code/2023/01/part1.c
new file mode 100644
index 0000000..3aace2a
--- /dev/null
+++ b/advent-of-code/2023/01/part1.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+
+#include "str.h"
+
+
+int main() {
+    FILE* fp = fopen("./input", "r");
+    int sum = 0;
+    while (1) {
+        char *line = str_strip(fgetline(fp));
+        if (line == NULL || strlen(line) == 0) {
+            break;
+        }
+        int d1 = -1, d2 = -1;
+        while (*line != '\0') {
+            if (isdigit(*line)) {
+                if (d1 == -1) d1 = *line - '0';
+                d2 = *line - '0';
+            }
+            line++;
+        }
+        if (d2 == -1) d2 = d1;
+        sum += d1 * 10 + d2;
+    }
+    printf("%d\n", sum);
+    return 0;
+}
+