UVA 113 Power of Cryptography
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Power of Cryptography
Background
Current work in cryptography involves (among other things) large prime numbers and computing powers of numbers modulo functions of 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 of only theoretical interest.
This problem involves the efficient computation of integer roots of numbers.
The Problem
Given an integer and an integer you are to write a program that determines , the positive root of p. In this problem, given such integers n and p, p will always be of the form for an integer k (this integer is what your program must find).
The 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 , and there exists an integer k, such that .
The Output
For each integer pair n and p the value should be printed, i.e., the number k such that .
Sample Input
21632774357186184021382204544
Sample Output
431234
题意:输入2个数字n, m求出logn (m) 。。。 看似要用高精度,,其实直接用double就可以过了。。毕竟只到100位。。所以变得很水
#include <stdio.h>#include <string.h>#include <math.h>int main(){ double n, m; while (scanf("%lf%lf", &n, &m) != EOF) {printf("%d\n", (int)(pow(m, 1/n) + 0.5)); } return 0;}
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