HDU 2509 博弈

#include <stdio.h>  
int main()  
{  
    int i,N,a[101];  
    int sum1;
    int sum2; 
    int gx;  
    while(scanf("%d",&N)!=EOF)  
    {
        sum1=0;  
        sum2=0;  
        gx=0;    
        for (i=0;i<N;i++)  
        {  
           scanf("%d",&a[i]);  
           if(a[i]>=2) sum1++;  
           else sum2++;   
           gx^=a[i];  
        }  
        if((gx!=0 && sum1!=0) || (gx==0) && sum1==0)  
           printf("Yes\n");  
        if((gx==0 && sum1>=2) || (gx!=0 && sum2%2!=0 && sum1==0)) 
			printf("No\n");     
    }                                                      
    return 0;                   
}