hdu 2509 博弈

转载：http://qianmacao.blog.163.com/blog/static/20339718020123555821140/

#include<iostream>
#include<cstdlib>
#include<cstring>
#include<cstdlib>
#include<algorithm>
#define INF 99999999
#define maxn 100005
#define LL long long
using namespace std;
int main()
{
	int n;
	while(cin>>n)
	{
		int r=0;
		int cnt=0;
		for(int i=0;i<n;i++)
		{
			int x;
			cin>>x;
			r=r^x;
			if(x>1)
				cnt++;
		}
		if(r==0)
		{
			if(cnt==0)
				cout << "Yes\n";
			else
				cout << "No\n"; 
		}
		else
		{
			if(cnt==0)
				cout << "No\n";
			else
				cout << "Yes\n";
		}
	}
	return 0;	
}