73. Set_Matrix_Zero.py

Given an m x n integer matrix matrix, if an element is 0, set its entire row and column to 0's.

You must do it in place.

Example 1:

Input: matrix = [[1,1,1],[1,0,1],[1,1,1]]
Output: [[1,0,1],[0,0,0],[1,0,1]]
Example 2:

Input: matrix = [[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]]

############ SOLUTION ##############
class Solution:
    def setZeroes(self, matrix: List[List[int]]) -> None:
        n = len(matrix)
        m = len(matrix[0])
        
        row = [0]*n
        col = [0]*m
        for i in range(n):
            for j in range(m):
                if matrix[i][j]==0:
                   row [i]=1
                   col[j]=1
                 
        for i in range(n):
            for j in range(m):
                if row[i] or col[j]:
                    matrix[i][j] = 0

        return matrix