http://acm.csu.edu.cn/OnlineJudge/problem.php?id=1756 直接暴力O(n^2logn)过不了 两两算gcd 考虑每个数的范围[1,1000]统计一下即可O(1000^2*log(1000)) Notice:1与任何数互质,需要特判(自己与自己互质) Code1 统计 // <1756.cpp> - Wed Oct 19 08:25:53 2016 // This file is made by YJinpeng,created by XuYik…
Description xrdog has a number set. There are 95 numbers in this set. They all have something in common and are all positive integers less than 500. The naughty xiao zhuan has deleted one of the numbers in the set. Can you find the number that xiao z…
欢迎访问我的新博客:http://www.milkcu.com/blog/ 原文地址:http://www.milkcu.com/blog/archives/uva10168.html 原创:Summation of Four Primes - PC110705 作者:MilkCu 题目描述 Summation of Four Primes Waring's prime number conjecture states that every odd integer is either pri…
Summation of Four Primes Input: standard input Output: standard output Time Limit: 4 seconds Euler proved in one of his classic theorems that prime numbers are infinite in number. But can every number be expressed as a summation of four positive prim…
题目链接:http://acm.csu.edu.cn/csuoj/problemset/problem?pid=1552 Description On an alien planet, every extraterrestrial is born with a number. If the sum of two numbers is a prime number, then two extraterrestrials can be friends. But every extraterrestr…
Description: Count the number of prime numbers less than a non-negative number, n click to show more hints. Credits:Special thanks to @mithmatt for adding this problem and creating all test cases. 求n以内的所有素数,以前看过的一道题目,通过将所有非素数标记出来,再找出素数,代码如下: public i…
Peter wants to generate some prime numbers for his cryptosystem. Help him! Your task is to generate all prime numbers between two given numbers! Input The input begins with the number t of test cases in a single line (t<=10). In each of the next t li…
Sum of Consecutive Prime Numbers Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 20050 Accepted: 10989 Description Some positive integers can be represented by a sum of one or more consecutive prime numbers. How many such representatio…
传送门 Description A ring is composed of n (even number) circles as shown in diagram. Put natural numbers 1, 2, . . . , n into each circle separately, and the sum of numbers in two adjacent circles should be a prime. Note: the number of first circle sho…
hdu5901题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5901 code vs 3223题目链接:http://codevs.cn/problem/3223/ 思路:主要是用了一个Meisell-Lehmer算法模板,复杂度O(n^(2/3)).讲道理,我不是很懂(瞎说什么大实话....),下面输出请自己改 #include<bits/stdc++.h> using namespace std; typedef long long LL;…
hihoCoder #1425 : What a Beautiful Lake(美丽滴湖) 时间限制:1000ms 单点时限:1000ms 内存限制:256MB Description - 题目描述 Weiming Lake, also named "Un-named Lake", is the most famous scenic spot in Peking University. It is located in the north of the campus and is su…
Problem Description A ring is compose of n circles as shown in diagram. Put natural number 1, 2, ..., n into each circle separately, and the sum of numbers in two adjacent circles should be a prime. Note: the number of first circle should always be 1…
Problem Description A ring is compose of n circles as shown in diagram. Put natural number 1, 2, ..., n into each circle separately, and the sum of numbers in two adjacent circles should be a prime. Note: the number of first circle should always be 1…
/*本篇为转载,在此申明,具体就是先设定从2以后所有的数都为质数,定为质数的数的倍数则不是质数,慢慢排除后面的数*/ #include<iostream>#include<cstring>using namespace std;const int N = 1300000;//第10万个数为1299709int prime[N];bool notPrime[N]; int main(){ memset(prime,0,sizeof(prime)); memset(notPrime,…
题目链接: 传送门 Sum of Consecutive Prime Numbers Time Limit: 1000MS Memory Limit: 65536K Description Some positive integers can be represented by a sum of one or more consecutive prime numbers. How many such representations does a given positive intege…
题目链接: 传送门 Prime Land Time Limit: 1000MS Memory Limit: 10000K Description Everybody in the Prime Land is using a prime base number system. In this system, each positive integer x is represented as follows: Let {pi}i=0,1,2,... denote the increasing…
