【HDU 1846】 Brave Game

【题目链接】

http://acm.hdu.edu.cn/showproblem.php?pid=1846

【算法】

巴什博弈

若有(m+1)个石子,显然先手不能直接取完,后手必胜

因此,我们可以把石子总数表示为 : n = k(m+1) + r

若r不为0,则先手取走r个,若后手取s个,先手取(m + 1 - s)个,只要保证留给对手的石子数是(m+1)的倍数即可,先手必胜

否则,先手必败

【代码】

#include<bits/stdc++.h>
using namespace std;

int T,n,m;

int main()
{

        scanf("%d",&T);
        while (T--)
        {
                scanf("%d%d",&n,&m);
                if (n % (m + 1)) printf("first\n");
                else printf("second\n");
        }

        return 0;

}

原文地址:https://www.cnblogs.com/evenbao/p/9298247.html

时间: 2024-11-10 16:19:33

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