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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. bool checkExtremeDiagonals(vector<string>& grid, int n, int m) {
  6.     char topLeft = grid[0][0];
  7.     char bottomLeft = grid[n - 1][0];
  8.     char topRight = grid[0][m - 1];
  9.     char bottomRight = grid[n - 1][m - 1];
  10.     return topLeft == bottomRight && bottomLeft == topRight;
  11. }
  12.  
  13. bool checkRectangles(vector<string>& grid, int n, int m) {
  14.     // Check horizontal and vertical pairs
  15.     for (int i = 0; i < n - 1; ++i) {
  16.         for (int j = 0; j < m - 1; ++j) {
  17.             if (grid[i][j] != grid[i + 1][j] && grid[i][j] != grid[i][j + 1]) {
  18.                 return false;
  19.             }
  20.         }
  21.     }
  22.     // Check extreme diagonals
  23.     return checkExtremeDiagonals(grid, n, m);
  24. }
  25.  
  26. int main() {
  27.     int t;
  28.     cin >> t;
  29.  
  30.     while (t--) {
  31.         int n, m;
  32.         cin >> n >> m;
  33.         vector<string> grid(n);
  34.         for (int i = 0; i < n; ++i) {
  35.             cin >> grid[i];
  36.         }
  37.  
  38.         bool possible = checkRectangles(grid, n, m);
  39.  
  40.         if (possible) {
  41.             cout << "YES" << endl;
  42.         } else {
  43.             cout << "NO" << endl;
  44.         }
  45.     }
  46.  
  47.     return 0;
  48. }
  49.  
Success #stdin #stdout 0.01s 5308KB
comments (?)
stdin
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8
2 1
W
B
6 6
WWWWBW
WBWWWW
BBBWWW
BWWWBB
WWBWBB
BBBWBW
1 1
W
2 2
BB
BB
3 4
BWBW
WBWB
BWBW
4 2
BB
BB
WW
WW
4 4
WWBW
BBWB
WWBB
BBBB
1 5
WBBWB
stdout
copy 
NO
NO
YES
YES
NO
NO
NO
NO
https://ideone.com/Vpydm3
language:
C++ 4.3.2 (gcc-4.3.2)
created:
16 days ago
visibility:
public

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