UVA 839 Not so Mobile

#include <cstdio>int judge() {int wl, dl, wr, dr;scanf("%d%d%d%d", &wl, &dl, &wr, &dr);if (wl == 0) //判断左边是否有子天平wl = judge();if (wr == 0) //判断右边是否有子天平wr = judge();if (wl == 0 || wr == 0) //假如左边或右边的重量为 0, 说明子天平不平衡, 返回 0,判断结束 return 0;return wl * dl == wr * dr ? wl + wr : 0; //假如天平平衡，则把天平的重量返回给上一级; 假如天平不平衡,　则返回 0;}int main() {int t;scanf("%d", &t);while (t--) {judge() ? printf("YES\n") : printf("NO\n");if (t) printf("\n");}return 0;}