又看了下英文题面，确实是（1）（3）（4）（2）
```
From question 1, we know trough 1 is filled.
From question 3, we then know trough 4 is empty.
From question 4, we then know that trough 3 is filled.
From question 2, we then know that trough 2 is empty.
```
by C201914 @ 2018-11-06 19:23:48
最关键的是```NOT UNIQUE```和```IMPOSSIBLE```QWQ就这样丢了50
by C201914 @ 2018-11-06 20:20:23
确实，开始时我也没看明白...
by WhiteLabs @ 2021-07-22 14:36:36
这题暴力出奇迹
by Gaode_Sean @ 2021-10-13 10:50:11
这题面确实让我迷惑了……
@[小粉兔](/user/10703)
by dingshengyang @ 2022-12-25 12:20:21