Power of Cryptography（POJ-2109 && UVA-113）

Description

Current work in cryptography involves (among other things) large prime numbers and computing powers of numbers among these primes. Work in this area has resulted in the practical use of results from number theory and other branches of mathematics once considered to be only of theoretical interest.
This problem involves the efficient computation of integer roots of numbers.
Given an integer n>=1 and an integer p>= 1 you have to write a program that determines the n th positive root of p. In this problem, given such integers n and p, p will always be of the form k to the n^th. power, for an integer k (this integer is what your program must find).

Input

The input consists of a sequence of integer pairs n and p with each integer on a line by itself. For all such pairs 1<=n<= 200, 1<=p<10¹⁰¹ and there exists an integer k, 1<=k<=10⁹ such that kⁿ = p.

Output

For each integer pair n and p the value k should be printed, i.e., the number k such that k n =p.

Sample Input

2 163 277 4357186184021382204544

Sample Output

431234

题意：给你两个整数n、p，存在一个整数k，使k的n次方等于p，求k；

思路：这个题的分类是贪心，一时间没想到怎么用贪心做，就用了pow函数试了一下，没想到过了。。。。

#include<iostream>#include<cstdio>#include<cstring>#include<cmath>using namespace std;int main(){    double n,p;    while(scanf("%lf%lf",&n,&p)!=EOF)    {        cout<<(pow(p,1/n))<<endl;    }    return 0;}