1 files changed, 21 insertions, 0 deletions

diff --git a/2023/01/1a.c b/2023/01/1a.c
new file mode 100644
index 0000000..0983236
--- /dev/null
+++ b/2023/01/1a.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+#define N 10000
+
+int main() {
+        char *buf, line[N];
+        int first, last, sum;
+
+        sum = 0;
+        while ((buf = fgets(line, N, stdin)) != NULL) {
+                for (first = -1; *buf; buf++) {
+                        if (*buf < '0' || *buf > '9')
+                                continue;
+                        first = first == -1 ? *buf - '0' : first;
+                        last = *buf - '0';
+                }
+                sum += 10 * first + last;
+        }
+        printf("%d\n", sum);
+        return 0;
+}