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Question Problem D-Diagonal Separation

Sample Test 1:

4 3
4 1 B
3 2 W
1 3 B
  1. If a cell is painted W, then can we change that cell to B if i+1 cell is black B?
  2. If a cell is painted W, then can we not change that cell to B if the i+1 cell is white W?

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