hdu2509

Be the Winner

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 593    Accepted Submission(s): 296

Problem Description

Let's consider m apples divided into n groups. Each group contains no more than 100 apples, arranged in a line. You can take any number of consecutive apples at one time.
For example "@@@" can be turned into "@@" or "@" or "@ @"(two piles). two people get apples one after another and the one who takes the last is
the loser. Fra wants to know in which situations he can win by playing strategies (that is, no matter what action the rival takes, fra will win).

 

Input

You will be given several cases. Each test case begins with a single number n (1 <= n <= 100), followed by a line with n numbers, the number of apples in each pile. There is a blank line between cases.

 

Output

If a winning strategies can be found, print a single line with "Yes", otherwise print "No".

 

Sample Input

22 213

 

Sample Output

NoYes

 

#include<iostream>
#include<stdio.h>
using namespace std;
int main()
{
    int n;
    while(scanf("%d",&n)==1)
    {
        int sum=0;
        int u,k=0;
        for(int i=0;i<n;i++)
        {
            cin>>u;
            sum=sum^u;
            if(u>1)k++;
        }
        if(k==0)
        {
            if(n%2==0)cout<<"Yes"<<endl;
            else cout<<"No"<<endl;
        }
        else
        {
            if(sum==0)cout<<"No"<<endl;
            else cout<<"Yes"<<endl;
        }
    }
    return 0;

}

这个是一个博弈题目，详细情况可以看我转载的博弈问题总结。其中，这个题目的意思就是给你几个组合判断能不能赢。。。