Zero matrix lcci

leetcode.cc

class Solution:
    def setZeroes(self, matrix: List[List[int]]) -> None:
        """
        Do not return anything, modify matrix in-place instead.
        """
        n,m = len(matrix),len(matrix[0])
        row,col = [0]*n,[0]*m
        for i in range(n):
            for j in range(m):
                if matrix[i][j]==0: 
                    row[i] = True
                    col[j]= True 

        for i in range(n):
            for j in range(m):
                if row[i] or col[j]:
                    matrix[i][j]=0