304. Range Sum Query 2D - Immutable

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Given a 2D matrix matrix, handle multiple queries of the following type: - 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. - int sumRegion(int row1, int col1, int row2, int col2) Ret

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solution.cppC++17

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