1 files changed, 21 insertions, 0 deletions
diff --git a/prog/aoc/23/1/1.c b/prog/aoc/23/1/1.c
new file mode 100644
index 0000000..ce0f01f
--- /dev/null
+++ b/prog/aoc/23/1/1.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <stdlib.h>
+int main (void) {
+	int c = getchar();
+	int prev = -1;
+	int sum = 0;
+	while (!ferror(stdin) && !feof(stdin)) {
+		if (c == '\n') {
+			sum += prev;
+			prev = -1;
+		}
+		if (c <= '9' && c >= '0') {
+			if (prev == -1)
+				sum += 10*(c-'0');
+			prev = c-'0';
+		}
+		c = getchar();
+
+	}
+	printf("%d\n", sum);
+}