GCD 描述 The greatest common divisor GCD(a,b) of two positive integers a and b,sometimes written (a,b),is the largest divisor common to a and b,For example,(1,2)=1,(12,18)=6. (a,b) can be easily found by the Euclidean algorithm. Now Carp is considering…
题意: 给一些数Ai(第 i 个数),Ai这些数代表的是某个数欧拉函数的值,我们要求出数 Ni 的欧拉函数值不小于Ai.而我们要求的就是这些 Ni 这些数字的和sum,而且我们想要sum最小,求出sum最小多少. 解题思路: 要求和最小,我们可以让每个数都尽量小,那么我们最后得到的肯定就是一个最小值. 给定一个数的欧拉函数值ψ(N),我们怎么样才能求得最小的N? 我们知道,一个素数P的欧拉函数值ψ(P)=P-1.所以如果我们知道ψ(N),那么最小的N就是最接近ψ(N),并且大于ψ(N)的素数.我…
GCD nyoj 1007 (欧拉函数+欧几里得) GCD 时间限制:1000 ms | 内存限制:65535 KB 难度:3 描述 The greatest common divisor GCD(a,b) of two positive integers a and b,sometimes written (a,b),is the largest divisor common to a and b,For example,(1,2)=1,(12,18)=6.(a,b) can be…
题目: GCD Again Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 125 Accepted Submission(s): 84 Problem Description Do you have spent some time to think and try to solve those unsolved problem afte…