Help Bob (141 - ZOJ Monthly, July 2015 )

题意:

现在有1~n个数,每次从中取出一个数,同时把这个数的所有因子取出。最后一个不能取数的人输

分析:

1是所有数的因子,所有第一次任取一个数1都会被取走;下面分两种情况:

我们先把1拿出来,对于其他的数

1、如果先手必败,那么先手第一次取1,然后把这种必败的状态留给对手,则先手必胜

2、如果先手必胜,则按照必胜的策越即可(1作为附带的被取出)

#include <cstdio>
int main()
{
    int n;
    while(scanf("%d",&n)==1)
    {
        if(n==0)
            printf("fail\n");
        else
            printf("win\n");
    }
    return 0;
}

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时间: 2024-10-21 09:32:29

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