矩阵置零的程序 python小白有点不知道为啥这样不行(class Solution: def setZeroes(self, matrix: List[List[int]]) -> None: """ Do not return anything, modify matrix in-place instead. """ mark=[] for i in range(len(matrix)): for j in range(len(matrix[0])): if matrix[i][j]==0: mark.append((i,j)) for i,j in mark: matrix[i]=[0]*len(matrix[0]) # matrix[:][j]=0 为啥这样就没修改呢 for l in range(len(matrix)): matrix[l][j]=0