poj 1740 A New Stone Game

#include<stdio.h>
#include<string.h>
bool flag[110];
int main()
{
    int n,i,x;
    int js;
    while(scanf("%d",&n)!=EOF&&n)
    {
        memset(flag,0,sizeof(flag));
        js=0;
        for(i=0;i<n;i++)
        {
            scanf("%d",&x);
            flag[x]=1^flag[x];
            if(flag[x])js++;
            else js--;
            //printf("%d ",ans);
        }
        //printf("%d ",ans);
        if(js)printf("1
");
        else printf("0
");
    }
    return 0;
}

只要开始不全是两两相等,那先取者必胜.