[？？？](https://www.luogu.com.cn/record/list?pid=P1469&user=ptsxlhs&page=1)
by 大眼仔Happy @ 2024-02-21 14:37:52
@[ptsxlhs](/user/725114)
```cpp
#include<bits/stdc++.h>
using namespace std;
int s,n,ans=0;
int main(){
scanf("%d",&n);
for(int i = 1 ; i <= n; ++i) {
scanf("%d",&s);
ans ^= s;
}
printf("%d",ans);
return 0;
}
```
by quxiangyu @ 2024-02-21 14:55:49
@[quxiangyu](/user/1241537) 谢谢大佬！！！通过了！！！
by ptsxlhs @ 2024-02-21 15:10:57