complete 19532 with boj step12 rework & setting zeta_C with clang-18

zeta_C/completed/19532.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+    int a, b, c, d, e, f;
+    scanf("%d %d %d %d %d %d", &a, &b, &c, &d, &e, &f);
+    for (int x = -999; x <= 999; x++) {
+        for (int y = -999; y <= 999; y++) {
+            if (a * x + b * y == c && d * x + e * y == f) {
+                printf("%d %d\n", x, y);
+                goto finish;
+            }
+        }
+    }
+
+    finish:
+    return 0;
+}

zeta_C/run.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+if [ -z "$*" ]; then echo "No args"; exit 0; fi
+clang-18 -std=c17 $1
+./a.out < stdin.txt