题目链接:https://vjudge.net/problem/LightOJ-1259 1259 - Goldbach`s Conjecture    PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB Goldbach's conjecture is one of the oldest unsolved problems in number theory and in all of mathem…

题目链接:https://cn.vjudge.net/problem/LightOJ-1259 题意 给一个整数n,问有多少对素数a和b,使得a+b=n 思路 素数筛 埃氏筛O(nloglogn),这个完全够用,当n=3.5e7时将近一秒(1e8次操作) 欧拉筛O(n) 考虑数论专题过完了就写个模版专题 提交过程 AC 代码 #include <cstdio> #include <cstring> using namespace std; const int maxn=1e7+20…

题面 T组询问,每组询问是一个偶数n 验证哥德巴赫猜想 回答n=a+b 且a,b(a<=b)是质数的方案个数 Input Input starts with an integer T (≤ 300), denoting the number of test cases. Each case starts with a line containing an integer n (4 ≤ n ≤ 107, n is even). Sol 垃圾题,枚举质数就好 # include <bits/std…

[LightOJ1259]Goldbach`s Conjecture(数论) 题面 Vjudge T组询问,每组询问是一个偶数n 验证哥德巴赫猜想 回答n=a+b 且a,b(a<=b)是质数的方案个数 题解 筛出质数后直接暴力判断就行了 质数密度没有那么大,记得节约空间 #include<iostream> #include<cstdio> #include<cstdlib> #include<cstring> #include<cmath>…

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…

 Goldbach's Conjecture Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Description In 1742, Christian Goldbach, a German amateur mathematician, sent a letter to Leonhard Euler in which he made the following…

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…

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…

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…

Goldbach's Conjecture Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 5277    Accepted Submission(s): 2022点我 Problem Description Goldbach's Conjecture: For any even number n greater than or equa…