opt=1那里错了,不是循环期间输出,不然输出肯定比正解输出多啊
```
for(auto i=s.begin();i!=it;i++,tmp++);
printf("%d\n",tmp);
```
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@[fedoralxy](/user/491542)
by yutong_Seafloor @ 2024-04-09 18:21:17
@[yutong_Seafloor](/user/773747) 过了,thx
by fedoralxy @ 2024-04-09 18:35:10