HDU-1165-Eddy's research II

这个事实上是一个递归题。题目非常easy。m的数非常小。分三种情况。算一下。就能够直接把公式算出来。

当然,也能够用dp做;

#include<iostream>
#include<string>
#include<cstdio>
#include<cstring>
#include<queue>
#include<map>
#include<set>
#include<vector>
#include<algorithm>
#define LL long long
using namespace std;
/*
    自己收敲一下。递推就能够直接出来答案;
*/
int main()
{
    int n,m;
    while(~scanf("%d%d",&m,&n)){
        switch(m){
            case 1:printf("%d\n",n+2);break;
            case 2:printf("%d\n",2*n+3);break;
            case 3:printf("%lld\n",(LL)(2<<(n+2))-3);break; //  好吧,我递推出来,是2^(n+3)-3,位运算的时候得注意了是2<<(n+2)-3。
        }
    }
    return 0;
}

HDU-1165-Eddy's research II

时间: 2024-11-14 12:18:19

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