73. Set Matrix Zeroes

class Solution:
    def setZeroes(self, matrix: List[List[int]]) -> None:
        """
        Do not return anything, modify matrix in-place instead.
        """
        col=set()
        row=set()

        for i in range (len(matrix)):
            for j in range (len(matrix[0])):
                if (matrix[i][j]==0):
                    col.add(j)
                    row.add(i)

        

        for i in row:
            for j in range (len(matrix[0])):
                matrix[i][j]=0

        for i in range (len(matrix)):
            for j in col:
                matrix[i][j]=0