#include<stdio.h>

int main() {

    double a, b, c, d, val;

    scanf("%lf %lf %lf %lf", &a, &b, &c, &d);

    while(a != 0 || b != 0 || c != 0 || d != 0) {

        val = a*d - b*c;

        if(val == 0) {

            printf("cheat!\n");

        }

        else {

            printf("%.5lf %.5lf\n%.5lf %.5lf\n", d/val, -b/val, -c/val, a/val);

        }

        scanf("%lf %lf %lf %lf", &a, &b, &c, &d);

    }

    return 0;

}

以上，手動輸入測資的話沒問題，但submit後就TLE了

到底為什麼呢？