Python solution, one line per function.

  • 0
    class NumMatrix(object):
        def __init__(self, matrix):
            self.matrix = matrix
        def update(self, row, col, val):
        def sumRegion(self, row1, col1, row2, col2):
            return reduce(lambda s, row: s+sum(row[col1:col2+1]),self.matrix[row1:row2+1],0)

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