3212. Count Submatrices With Equal Frequency of X and Y

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Given a 2D character matrix grid, where grid[i][j] is either 'X', 'Y', or '.', return the number of submatrices that contain: - grid[0][0] - an equal frequency of 'X' and 'Y'. - at least one 'X'. Example 1: Input: grid = [["X","Y","."],["Y",".","."]] Output: 3 Explanation: Example 2: Input: grid = [["X","X"],["X","Y"]] Output: 0 Explanation: No submatrix has an equal frequency of 'X'

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