2818: Gcd

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BZOJ 2818: Gcd [欧拉函数质数线性筛]【学习笔记】

2818: Gcd Time Limit: 10 Sec Memory Limit: 256 MBSubmit: 4436 Solved: 1957[Submit][Status][Discuss] Description 给定整数N,求1<=x,y<=N且Gcd(x,y)为素数的数对(x,y)有多少对. 1<=N<=10^7 uva上做过gcd(x,y)=1的题 gcd(x,y)=p ---> gcd(x/p,y/p)=1 每个质数做一遍行了答案是欧拉函数的前缀和*2…

BZOJ 2818: Gcd

2818: Gcd Time Limit: 10 Sec Memory Limit: 256 MBSubmit: 4443 Solved: 1960[Submit][Status][Discuss] Description 给定整数N,求1<=x,y<=N且Gcd(x,y)为素数的数对(x,y)有多少对. Input 一个整数N Output 如题 Sample Input 4 Sample Output 4 HINT hint对于样例(2,2),(2,4),(3,3),(4,2) 1&l…

bzoj 2818: Gcd GCD(a,b) = 素数

2818: Gcd Time Limit: 10 Sec Memory Limit: 256 MBSubmit: 1566 Solved: 691[Submit][Status] Description 给定整数N,求1<=x,y<=N且Gcd(x,y)为素数的数对(x,y)有多少对. Input 一个整数N Output 如题 Sample Input 4 Sample Output 4 HINT hint 对于样例(2,2),(2,4),(3,3),(4,2) 1<=N<=…

bzoj 2818: Gcd 歐拉函數

2818: Gcd Time Limit: 10 Sec Memory Limit: 256 MBSubmit: 1633 Solved: 724[Submit][Status] Description 给定整数N,求1<=x,y<=N且Gcd(x,y)为素数的数对(x,y)有多少对. Input 一个整数N Output 如题 Sample Input 4 Sample Output 4 HINT hint 对于样例(2,2),(2,4),(3,3),(4,2) 1<=N<=…

Bzoj 2818: Gcd 莫比乌斯,分块,欧拉函数,线性筛

2818: Gcd Time Limit: 10 Sec Memory Limit: 256 MBSubmit: 3241 Solved: 1437[Submit][Status][Discuss] Description 给定整数N,求1<=x,y<=N且Gcd(x,y)为素数的数对(x,y)有多少对. Input 一个整数N Output 如题 Sample Input 4 Sample Output 4 HINT hint 对于样例(2,2),(2,4),(3,3),(4,2) 1&…

2818: Gcd Time Limit: 10 Sec Memory Limit: 256 MBSubmit: 2170 Solved: 979[Submit][Status][Discuss] Description 给定整数N,求1<=x,y<=N且Gcd(x,y)为素数的数对(x,y)有多少对. Input 一个整数N Output 如题 Sample Input 4 Sample Output 4 HINT hint 对于样例(2,2),(2,4),(3,3),(4,2) 1&l…

BZOJ 2818 Gcd(欧拉函数+质数筛选）

2818: Gcd Time Limit: 10 Sec Memory Limit: 256 MB Submit: 9108 Solved: 4066 [Submit][Status][Discuss] Description 给定整数N,求1<=x,y<=N且Gcd(x,y)为素数的数对(x,y)有多少对. Input 一个整数N Output 如题 Sample Input 4 Sample Output 4 HINT hint 对于样例(2,2),(2,4),(3,3),(4,2)…

bzoj 2818 gcd 线性欧拉函数

2818: Gcd Time Limit: 10 Sec Memory Limit: 256 MB[Submit][Status][Discuss] Description 给定整数N,求1<=x,y<=N且Gcd(x,y)为素数的数对(x,y)有多少对. Input 一个整数N Output 如题 Sample Input 4 Sample Output 4 HINT hint 对于样例(2,2),(2,4),(3,3),(4,2) 1<=N<=10^7 思路:gcd(x,y)…

BZOJ 2818: Gcd 筛法

2818: Gcd 题目连接: http://www.lydsy.com/JudgeOnline/problem.php?id=2818 Description 给定整数N,求1<=x,y<=N且Gcd(x,y)为素数的数对(x,y)有多少对. Input 一个整数N Output 如题 Sample Input 4 Sample Output 4 Hint 题意题解: gcd(x,y) = p的对数等于 gcd(x/p,y/p)=1的对数那么实际上就是求sigma(phi),但是这个…

BZOJ 2818 GCD 【欧拉函数 || 莫比乌斯反演】

传送门:https://www.lydsy.com/JudgeOnline/problem.php?id=2818 2818: Gcd Time Limit: 10 Sec Memory Limit: 256 MBSubmit: 9236 Solved: 4126[Submit][Status][Discuss] Description 给定整数N,求1<=x,y<=N且Gcd(x,y)为素数的数对(x,y)有多少对. Input 一个整数N Output 如题 Sample Input…