73.py

classSolution(object):
defsetZeroes(self, matrix):
"""
 :type matrix: List[List[int]]
 :rtype: void Do not return anything, modify matrix in-place instead.
 """
col0=1
forrowinrange(len(matrix)):
ifmatrix[row][0] ==0:
col0=0
forcolinrange(1, len(matrix[0])):
ifmatrix[row][col] ==0:
matrix[row][0] =0
matrix[0][col] =0
forrowinrange(len(matrix)-1, -1, -1):
forcolinrange(len(matrix[0])-1, 0, -1):
ifmatrix[row][0] ==0ormatrix[0][col] ==0:
matrix[row][col] =0
ifcol0==0:
matrix[row][0] =0