class NumMatrix(object): def __init__(self, matrix): """ initialize your data structure here. :type matrix: List[List[int]] """ self.matrix = matrix def sumRegion(self, row1, col1, row2, col2): """ sum of elements matrix[(row1,col1)..(row2,col2)], inclusive. :type row1: int :type col1: int :type row2: int :type col2: int :rtype: int """ sm = 0 for i in self.matrix[row1:row2+1]: sm += sum(i[col1:col2+1]) return sm
python solution 4 lines
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