D - Problem D. Euler Function HDU - 6322

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HDU 6322.Problem D. Euler Function -欧拉函数水题(假的数论题￣▽￣) (2018 Multi-University Training Contest 3 1004)

6322.Problem D. Euler Function 题意就是找欧拉函数为合数的第n个数是什么. 欧拉函数从1到50打个表,发现规律,然后勇敢的水一下就过了. 官方题解: 代码: //1004-欧拉函数水题 #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<cmath> using namespace std; typede…

Day7 - D - The Euler function HDU - 2824

The Euler function phi is an important kind of function in number theory, (n) represents the amount of the numbers which are smaller than n and coprime to n, and this function has a lot of beautiful characteristics. Here comes a very easy question: s…

（2018 Multi-University Training Contest 3）Problem D. Euler Function

//题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=6322 //题目大意:给定 k,求第 k 小的数 n,满足 φ(n) 是合数.显然 φ(1) = 1 不是合数,只考虑 n ≥ 2 的情况.//思路:得到题意之后,查到了一张表(https://en.wikipedia.org/wiki/Euler%27s_totient_function)//得知当且仅当 n = 1, 2, 3, 4, 6 时,φ(n) 不是合数.第1小的K值是5,第二小的K值…

HDU——T 2824 The Euler function

http://acm.hdu.edu.cn/showproblem.php?pid=2824 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 7752 Accepted Submission(s): 3217 Problem Description The Euler function phi is an important kin…

hdu 2824 The Euler function

The Euler function Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5028 Accepted Submission(s): 2123 Problem Description The Euler function phi is an important kind of function in number theo…

hdu 2824 The Euler function(欧拉函数)

题目链接:hdu 2824 The Euler function 题意: 让你求一段区间的欧拉函数值. 题解: 直接上板子. 推导过程: 定义:对于正整数n,φ(n)是小于或等于n的正整数中,与n互质的数的数目. 例如:φ(8)=4,因为1,3,5,7均和8互质. 性质:1.若p是质数,φ(p)= p-1. 2.若n是质数p的k次幂,φ(n)=(p-1)*p^(k-1).因为除了p的倍数都与n互质 3.欧拉函数是积性函数,若m,n互质,φ(mn)= φ(m)φ(n). 根据这3条性质我们就可以推…