I tried use the following code to set the ith row to be zeros.

```
# zeroRow is a list to record whether ith row has zeros.
# e.g. zeroRow = [True, True, False] means 0th and 1st row have 0s and 2nd row don't have
for i in range(m):
if zeroRow[i]:
matrix[i]= [0 for i in range(n)]
```

But it doesn't work sometime.

For example:

```
input : [[1, 2, 3], [3, 0, 5], [2, 5, 0]]
output: [[1, 2, 3], [3, 0, 5], [0, 0, 0]]
```

Thanks