#include<stdio.h>
#include<math.h>

int main()
{
    int n, i, M, result;
    while (scanf("%d", &n) != EOF)
    {
        for (i = 0, result = 0; i < n; i++)
        {
            scanf("%d", &M);
            result ^= M;
        }
        if (result)
            printf("YES\n");
        else
            printf("NO\n");
    }
    return 0;
}

• 你的YES应该是Yes NO应该是No。。好像测试数据没有 1 1 应该是No (0) yang1z163 2008-09-17 16:28:55