[LeetCode] Range Sum Query 2D - Mutable

308. Range Sum Query 2D - Mutable Given a 2D matrix matrix, handle multiple queries of the following types: Update the value of a cell in matrix. Calculate the sum of the elements of matrix inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2). Implement the NumMatrix class: NumMatrix(int[][] matrix) Initializes the object with the integer matrix matrix. void update(int row, int col, int val) Updates the value of matrix[row][col] to be val. in...

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