题目:http://poj.org/problem?id=3421 记忆化搜索竟然水过去了.仔细一想时间可能有点不对,但还是水过去了. #include<iostream> #include<cstdio> #include<cstring> #define ll long long using namespace std; <<)+; int n; ll a[N],f[N]; void find(int x) { if(a[x])return; a[x]=…

POj3421X-factor Chains 一开始没读懂题意,不太明白 Xi | Xi+1 where a | b means a perfectly divides into b的意思,后来才发现是要满足后一个数是前一个数的倍数 题目要求1 = X0, X1, X2, …,  Xm = X,并且后一个数是前一个数的倍数,为了得到最长链,必须将数X进行质因数分解, 假设X=(a[1]^b[1])*...*(a[i]^b[i])*..(a[n]^b[n]),设m=b[1]+b[2]+..b[i]…

题目链接:http://poj.org/problem?id=1845 关于质因数分解,模板见:http://www.cnblogs.com/atmacmer/p/5285810.html 二分法思想:选定一个要进行比较的目标,在区间[l,r]之间不断二分,直到取到与目标相等的值. #include<iostream> #include<cstdio> #include<cstring> using namespace std; typedef long long ll…

GCD & LCM Inverse Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 16206   Accepted: 3008 Description Given two positive integers a and b, we can easily calculate the greatest common divisor (GCD) and the least common multiple (LCM) of a…

一.Description The most important part of a GSM network is so called Base Transceiver Station (BTS). These transceivers form the areas called cells (this term gave the name to the cellular phone) and every phone connects to the BTS with the strongest…

#include<stdio.h> #include<string.h> #include<stdlib.h> #include<time.h> #include<iostream> #include<algorithm> using namespace std; //**************************************************************** // Miller_Rabin 算法进…

J - 数论,质因数分解 Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Description Tomorrow is contest day, Are you all ready? We have been training for 45 days, and all guys must be tired.But , you are so lucky compa…

J - 数论,质因数分解 Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u   Description Tomorrow is contest day, Are you all ready?  We have been training for 45 days, and all guys must be tired.But , you are so lucky comparing with m…

Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u   Description Tomorrow is contest day, Are you all ready? We have been training for 45 days, and all guys must be tired.But , you are so lucky comparing with many excellent…

目录 Miller-Rabin质数测试 & Pollard-Rho质因数分解 Miller-Rabin质数测试 一些依赖的定理 实现以及正确率 Pollard-Rho质因数分解 生日悖论与生日攻击 主要思想 具体实现 Miller-Rabin质数测试 & Pollard-Rho质因数分解 考试遇见卡质因数分解的题了...活久见...毒瘤lun 于是就学了一发qaq Pollard-Rho分解质因数的话需要依赖另一个算法. Miller-Rabin质数测试 一个多项式时间的基于随机的质数测试…