```cpp
int y[500];
```
这里没赋初值，所以 UB 了。
改成
```cpp
int y[500]={0};
```
就可以了。
@[happy_xiaowan](/user/1160220)
by Disjoint_cat @ 2023-11-23 22:08:13
liu
by LeiSai_AC @ 2023-11-23 22:08:24
@[Donotplaygame](/user/549499) 改了实例也正确了感谢感谢
by happy_lazier @ 2023-11-23 22:22:52