题意: 就是哥德巴赫猜想...任意一个偶数 都可以分解成两个(就是一对啦)质数的加和 输入一个偶数求有几对.. 解析: 首先! 素数打表..因为 质数 + 质数 = 偶数 所以 偶数 - 质数 = 质数 ... 我真是蠢啊 还有  vis要用bool类型的!!!!  int会直接爆 代码如下: #include <iostream> #include <cstdio> #include <sstream> #include <cstring> #includ…

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…

1370 - Bi-shoe and Phi-shoe   PDF (English) Statistics   Time Limit: 2 second(s) Memory Limit: 32 MB Bamboo Pole-vault is a massively popular sport in Xzhiland. And Master Phi-shoe is a very popular coach for his success. He needs some bamboos for hi…

                                                                                1259 - Goldbach`s Conjecture 分拆素数和,本来很水的题,但硬生生跪了18+.这题卡内存实在太凶残了,MLT了10+,TLE了10+. 题意:在1e7内验证哥德巴赫猜想,求一个数拆分成两个不同的素数和有多少中方法. 思路:打表.就是打表. 但为什么会MLE呢,因为1e7的数组实在太大了,于是换了好几种写法优化,但…

哥德巴赫猜想-nefu2 & 分拆素数和 hdu2098 //哥德巴赫猜想 #include <iostream> #include <cmath> #include <cstring> using namespace std; bool isprime[10000000]; int main() { memset(isprime,1,sizeof(isprime)); isprime[0] = isprime[1] = false; for(int i = 4…

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…

http://lightoj.com/volume_showproblem.php?problem=1259 题目大意:给你一个数n,这个数能分成两个素数a.b,n = a + b且a<=b,问有几组这样的(a,b) 比较简单的哥德巴赫猜想题,不需要多说,但一般的素数判定会TLE,所以这里用的是素数筛选法 这里需要注意的是筛选出来素数数组的大小 #include<stdio.h> #include<math.h> #include<string.h> #inclu…

Goldbach`s Conjecture(LightOJ - 1259)[简单数论][筛法] 标签: 入门讲座题解 数论 题目描述 Goldbach's conjecture is one of the oldest unsolved problems in number theory and in all of mathematics. It states: Every even integer, greater than 2, can be expressed as the sum of…

题意:给出n,问满足a+b=n且a,b都为素数的有多少对 将素数打表,再枚举 #include<iostream> #include<cstdio> #include<cstring> #include <cmath> #include<stack> #include<vector> #include<map> #include<algorithm> #define mod=1e9+7; using names…

链接: https://vjudge.net/problem/LightOJ-1259 题意: Goldbach's conjecture is one of the oldest unsolved problems in number theory and in all of mathematics. It states: Every even integer, greater than 2, can be expressed as the sum of two primes [1]. Now…