d

class Solution:
    def setZeroes(self, matrix: List[List[int]]) -> None:
  
        m = len(matrix)
        n = len(matrix[0])
        firstRowZero = False
        firstColZero = False

        for i in range(m):
            if matrix[i][0] == 0:
                firstColZero = True
                break
        for j in range(n):
            if matrix[0][j] == 0:
                firstRowZero = True
                break
        for i in range(1,m):
            for j in range(1,n):
                if matrix[i][j] == 0:
                    matrix[i][0] = 0
                    matrix[0][j] = 0
             
        for i in range(1,m):
            if matrix[i][0] == 0:
                for j in range(n):
                    matrix[i][j] = 0
        if firstRowZero:
            for j in range(n):
                matrix[0][j] = 0
        if firstColZero:
            for i in range(m):
                matrix[i][0] = 0