func_code_string: #include <bits/stdc++.h>   using namespace std;   const int SIZE = 640;   int h, w;   int matr[SIZE][SIZE];   int main() {     int q;     scanf( %d , &q);     for (int tt = 0; tt < q; tt++) {       scanf( %d%d , &h, &w);       for (int i = 0; i < h; i++)         for (int j = 0; j < w; j++) scanf( %d , &matr[i][j]);       int cut = h / 2;       int diffZero = 0;       int diffSwap = 0;       for (int j = 0; j < w; j++) {         diffZero += abs(matr[cut - 1][j] - matr[cut][j]);         diffSwap += abs(matr[0][j] - matr[h - 1][j]);       }       ((void)0);       printf(diffZero < diffSwap ?  NO n  :  YES n );     }     return 0;   }   