init:

example/c-sum/solution.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+    if (scanf("%d", &n) != 1) return 1;
+
+    long long sum = 0;
+    for (int i = 0; i < n; i++) {
+        int x;
+        if (scanf("%d", &x) != 1) return 1;
+        sum += x;
+    }
+
+    printf("%lld\n", sum);
+    return 0;
+}