hdu 2095 异或“找不同”

 1 #include <cstdio>
 2 using namespace std;
 3 
 4 int main ()
 5 {
 6     int n;
 7     while ( scanf("%d", &n), n )
 8     {
 9         int ans = 0, tmp;
10         for ( int i = 0; i < n; i++ )
11         {
12             scanf("%d", &tmp);
13             ans = ans ^ tmp;
14         }
15         printf("%d\n", ans);
16     }
17     return 0;
18 }