-
Notifications
You must be signed in to change notification settings - Fork 0
/
73.py
59 lines (51 loc) · 1.17 KB
/
73.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
# 73. Set Matrix Zeroes
# 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]
# ]
# Follow up:
# A straight forward solution using O(mn) space is probably a bad idea.
# A simple improvement uses O(m + n) space, but still not the best solution.
# Could you devise a constant space solution?
from typing import List
class Solution:
def setZeroes(self, matrix: List[List[int]]) -> None:
"""
Do not return anything, modify matrix in-place instead.
"""
m = len(matrix)
n = len(matrix[0])
row_set = set()
column_set = set()
for i in range(m):
for j in range(n):
if matrix[i][j] == 0:
column_set.add(i)
row_set.add(j)
for i in range(m):
for j in range(n):
if i in column_set or j in row_set:
matrix[i][j] = 0