一.Description In 1742, Christian Goldbach, a German amateur mathematician, sent a letter to Leonhard Euler in which he made the following conjecture: Every even number greater than 4 can be written as the sum of two odd prime numbers. For example: 8…

http://poj.org/problem?id=2262 Goldbach's Conjecture Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 34323   Accepted: 13169 Description In 1742, Christian Goldbach, a German amateur mathematician, sent a letter to Leonhard Euler in whic…

题目大意:求讲一个整数n分解为两个素数的方案数. 题目思路:素数打表,后遍历 1-n/2,寻找方案数,需要注意的是:C/C++中 bool类型占用一个字节,int类型占用4个字节,在素数打表中采用bool类型可以节约不少内存. #include<iostream> #include<algorithm> #include<cstring> #include<vector> #include<stdio.h> #include<queue&g…

Pseudoprime numbers Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 7954 Accepted: 3305 Description Fermat's theorem states that for any prime number p and for any integer a > 1, ap = a (mod p). That is, if we raise a to the pth power and…

POJ 2262 Goldbach's Conjecture(素数相关) http://poj.org/problem?id=2262 题意: 给你一个[6,1000000]范围内的偶数,要你将它表示成两个素数相加和的形式.假设存在多组解,请输出两个素数差值最大的解. 分析: 首先我们用素数筛选法求出100W以内的全部素数. 筛选法求素数可见: http://blog.csdn.net/u013480600/article/details/41120083 对于给定的数X,假设存在素数a+素数b…

1.Link: http://poj.org/problem?id=2262 http://bailian.openjudge.cn/practice/2262 2.Content: Goldbach's Conjecture Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 37791   Accepted: 14536 Description In 1742, Christian Goldbach, a German a…

Problem Description Goldbach's Conjecture: For any even number n greater than or equal to 4, there exists at least one pair of prime numbers p1 and p2 such that n = p1 + p2. This conjecture has not been proved nor refused yet. No one is sure whether…

素数判定Miller_Rabin算法详解: http://blog.csdn.net/maxichu/article/details/45458569 大数因数分解Pollard_rho算法详解: http://blog.csdn.net/maxichu/article/details/45459533 然后是参考了kuangbin的模板: http://www.cnblogs.com/kuangbin/archive/2012/08/19/2646396.html 模板如下: //快速乘 (a…

题目链接: https://cn.vjudge.net/problem/POJ-2262 题目描述: In 1742, Christian Goldbach, a German amateur mathematician, sent a letter to Leonhard Euler in which he made the following conjecture: Every even number greater than 4 can be written as the sum of t…

/** 题目:F - Goldbach`s Conjecture 链接:https://vjudge.net/contest/154246#problem/F 题意:对一个大于2的偶数n,找有多少种方法使两个素数的和为n:保证素数a<=b; a+b==n; a,b都为素数. 思路:直接暴力,为了避免内存超限,用bool类型判断素数. */ #include<bits/stdc++.h> using namespace std; typedef long long ll; ; bool f…