class Solution:    # @param matrix, a list of lists of integers    # RETURN NOTHING, MODIFY matrix IN PLACE.    def setZeroes(self, matrix):        di=[]        dj=[]        n=len(matrix)        if n==0 :return         m=len(matrix[0])        for i in range(n):            for j in range(m):                if matrix[i][j]==0:                    di.append(i)                    dj.append(j)        for k in di:            for i in range(m):                matrix[k][i]=0        for k in dj :            for i in range(n):                for j in range(m):                    if j==k:                        matrix[i][j]=0