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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. bool checkAdjacentPairs(vector<string>& grid, int n, int m) {
  6.     // Check horizontally
  7.     for (int i = 0; i < n; ++i) {
  8.         for (int j = 0; j < m - 1; ++j) {
  9.             if (grid[i][j] != grid[i][j + 1]) {
  10.                 return false;
  11.             }
  12.         }
  13.     }
  14.     // Check vertically
  15.     for (int j = 0; j < m; ++j) {
  16.         for (int i = 0; i < n - 1; ++i) {
  17.             if (grid[i][j] != grid[i + 1][j]) {
  18.                 return false;
  19.             }
  20.         }
  21.     }
  22.     return true;
  23. }
  24.  
  25. int main() {
  26.     int t;
  27.     cin >> t;
  28.  
  29.     while (t--) {
  30.         int n, m;
  31.         cin >> n >> m;
  32.         vector<string> grid(n);
  33.         for (int i = 0; i < n; ++i) {
  34.             cin >> grid[i];
  35.         }
  36.  
  37.         bool possible = checkAdjacentPairs(grid, n, m);
  38.  
  39.         if (possible) {
  40.             cout << "YES" << endl;
  41.         } else {
  42.             cout << "NO" << endl;
  43.         }
  44.     }
  45.  
  46.     return 0;
  47. }
  48.  
Success #stdin #stdout 0s 5264KB
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
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NO
NO
YES
YES
NO
NO
NO
NO
https://ideone.com/e75rNT
language:
C++ 4.3.2 (gcc-4.3.2)
created:
16 days ago
visibility:
public

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