博弈相关知识

#include <iostream>
#include <cstring>
#include <cstdio>using namespace std;int main()
{int n;int m, s, flag;while(~scanf("%d", &n)){s = 0;flag = 0;for(int i = 0; i < n; ++i){cin>>m;s ^= m;if(m > 1)flag = 1;}if(flag == 0)if(n%2)cout<<"No"<<endl;elsecout<<"Yes"<<endl;elseif(s == 0)cout<<"No"<<endl;elsecout<<"Yes"<<endl;}return 0;
}