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304. Range Sum Query 2D - Immutable - 데일리 문제
304. Range Sum Query 2D - Immutable 난이도: Medium 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..
LeetCode
2022. 6. 3. 20:50