ACM.2234 Matches Game http://acm.pku.cn/JudgeOnline/problem?id=2234

#include <iostream>
using namespace std;
int main ()
{
 int n=0;
 while (cin>>n)
 {
     int m=0,l=0;
     for (int i=0;i<n;i++)
     {
      cin >>l;
      m^=l;
     }
     cout <<(m?"Yes":"No")<<endl;
 }
 return 0;
}