Relatives Given n, a positive integer, how many positive integers less than n are relatively prime to n? Two integers a and b are relatively prime if there are no integers x > 1, y > 0, z > 0 such that a = xy and b = xz. Input There are several t…
找新朋友 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Problem Description 新年快到了,“猪头帮协会”准备搞一个聚会,已经知道现有会员N人,把会员从1到N编号,其中会长的号码是N号,凡是和会长是老朋友的,那么该会员的号码肯定和N有大于1的公约数,否则都是新朋友,现在会长想知道究竟有几个新朋友?请你编程序帮会长计算出来. Input 第一行是测试数据的组…
题目: The Euler function Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 166 Accepted Submission(s): 96 Problem Description The Euler function phi is an important kind of function in number theory…
题目链接:https://vjudge.net/problem/POJ-2407 题意:给出n,求0..n-1中与n互质的数的个数. 思路:欧拉函数板子题,先根据唯一分解定理求出n的所有质因数p1,p2,...,pn,然后根据Φ(m)=m*∏(1-1/pi)计算即可. AC代码: #include<cstdio> using namespace std; int n,ans; int main(){ while(scanf("%d",&n),n){ ans=n; ;…
Relatives Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 11372 Accepted: 5544 Description Given n, a positive integer, how many positive integers less than n are relatively prime to n? Two integers a and b are relatively prime if ther…