原题：http://poj.org/problem?id=2234
#include<iostream>
using namespace std;
int m;
int main(){
while(cin>>m){
int x = 0;
while(m--){
int y;
cin>>y;
x = x^y;
}
if(x == 0) cout<<"No"<<endl;
else cout<<"Yes"<<endl;
}
return 0;
}
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