The Pilots Brothers' refrigerator

#include<iostream>
#include<cstdio>
#include<string>
using namespace std;
int mem[4][4];//用于储存翻转次数，如果是偶数，则相当于没有翻转int main(){char ch;for (int x = 0; x<4; x++){//按sample的顺序,x代表纵行,y是横列for (int y = 0; y <= 4; y++){ch = getchar();if (ch == '+'){for (int i = 0; i<4; i++){mem[i][y]++;}for (int j = 0; j<4; j++){mem[x][j]++;}mem[x][y]++;}}}int ans = 0;string str;for (int x = 0; x<4; x++){for (int y = 0; y<4; y++){int index = mem[x][y];if ((index / 2) * 2 != index){            //表明是奇数，则是需要点击一次ans++;str += ('1' + x);str += 32;str += '1' + y;str += '\n';}}}printf("%d\n", ans);cout << str;return 0;
}