把18行改成 `for(int i=0; i<ans.size(); i++)` 就行了
[AC记录](https://www.luogu.com.cn/record/146648173)
by lzh999 @ 2024-02-10 18:54:57
@[lzh999](/user/1033263)
感谢,[现在A了](https://www.luogu.com.cn/record/146693503),龙年快乐!
by 13389660737ljx @ 2024-02-11 20:13:00