@[牛子睿ovo](/user/358999)
试试这组数据：
```
33
VKVKVKVKVKVKVKVKVKVKVVKVKVKVKVKVK
```
你输出17，但应该是16
by sync_with_stdio @ 2021-02-21 18:25:22
```cpp
s[i]=='n';
s[i+1]=='n';
```
这句错了，应该是
```cpp
s[i]='n';
s[i+1]='n';
```
这步是标记
by q779 @ 2021-02-21 18:55:17