@[liujiachen0718](/user/1043408) 题解？
by zhangyuanxiao @ 2023-07-27 15:25:56
@[liujiachen0718](/user/1043408) a xor a = 0,0 xor a=a，0 xor 0 =0除落单的筷子外，其余的xor和应为0，而0 xor a=a，所以把输入的长度全xor起来就是答案
by cq_zry @ 2023-07-27 15:29:05
题解：你好
by ATZdhjeb @ 2023-07-27 15:31:17
```
#include<bits/stdc++.h>
using namespace std;
int main(){
int a,b,c=0;
cin>>a;
for(int var=0;var<a;var++){
cin>>b;
c^=b;
}
cout<<c;
return 0;
}
```
by WWW_bilibili_com @ 2023-08-07 17:05:17
这是我的代码，用的异或，不然会超标
by WWW_bilibili_com @ 2023-08-07 17:06:56