hdu 1850 Being a Good Boy in Spring Festival（Nimm Game）

#include<iostream>
#include<stdio.h>
using namespace std;

int main(){
    int m,a[128],i,sum,ans;
    while(~scanf("%d",&m)&&m){
        sum=0;
        for(i=0;i<m;++i){
            scanf("%d",&a[i]);
            sum^=a[i];
        }
        if(sum){
            ans=0;
            for(i=0;i<m;++i)
                if((sum^a[i])<a[i])++ans;//优先级
            printf("%d\n",ans);
        }
        else printf("0\n");
    }
    return 0;
}