Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in-place.
Example 1:
Input: [ [1,1,1], [1,0,1], [1,1,1] ] Output: [ [1,0,1], [0,0,0], [1,0,1] ] Example 2:
Input: [ [0,1,2,0], [3,4,5,2], [1,3,1,5] ] Output: [ [0,0,0,0], [0,4,5,0], [0,3,1,0] ]
My code:
class Solution:
def setZeroes(self, matrix):
"""
:type matrix: List[List[int]]
:rtype: void Do not return anything, modify matrix in-place instead.
"""
if len(matrix)==0:
return
m=len(matrix)
example=matrix[0]
if len(matrix)==0:
return
n=len(example)
lists=set()
for i in range(m):
for j in range(n):
if matrix[i][j]==0:
lists.add(i*n+j)
tmp_column={}
tmp_row={}
for item in lists:
column=item%n
row=int((item-column)/n)
#print(column)
#print(row)
if row not in tmp_row:
tmp_row[row]=0
for k in range(n):
matrix[row][k]=0
if column not in tmp_column:
tmp_column[column]=0
for k in range(m):
matrix[k][column]=0