HDU - 2516 取石子游戏 (斐波那契博弈)

题目链接:https://cn.vjudge.net/contest/269106#problem/F

题目大意:

        1堆石子有n个,两人轮流取.先取者第1次可以取任意多个,但不能全部取完.以后每次取的石子数不能超过上次取子数的2倍。取完者胜.先取者负输出"Second win".先取者胜输出"First win".

解题思路:

        斐波那契博弈,n为斐波那契数时先手必败,用map记录一下斐波那契数即可。

#include 
using namespace std;
typedef long long ll;
mapmp;
int main()
{
    ll i, n, a, b, c, len = 1e18;
    a = 1;
    b = 1;
    c = a + b;
    mp[1] = 1;
    while(c <= len)
    {
        mp[c] = 1;
        a = b;
        b = c;
        c = a + b;
    }
    while(scanf("%lld", &n) != EOF)
    {
        if(n == 0)break;
        if(mp[n] == 1)printf("Second win\n");
        else printf("First win\n");
    }
    return 0;
}

 

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