73. Set Matrix Zeros

class Solution(object):
    def setZeroes(self, matrix):
        """
        :type matrix: List[List[int]]
        :rtype: void Do not return anything, modify matrix in-place instead.
        """
        first_col=reduce(lambda acc,i:acc or matrix[i][0]==0, xrange(len(matrix)),False)
        first_row=reduce(lambda acc,j:acc or matrix[0][j]==0, xrange(len(matrix[0])),False)
        
        for i in xrange(1, len(matrix)):
            for j in xrange(1, len(matrix[0])):
                if matrix[i][j] == 0:
                    matrix[i][0], matrix[0][j] = 0, 0
        
        for i in xrange(1, len(matrix)):
            for j in xrange(1, len(matrix[0])):
                if matrix[i][0] == 0 or matrix[0][j] == 0:
                    matrix[i][j] = 0
        
        if first_col:
            for i in xrange(len(matrix)):
                matrix[i][0] = 0
                
        if first_row:
            for j in xrange(len(matrix[0])):
                matrix[0][j] = 0