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;…
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…
POJ 2739 Sum of Consecutive Prime Numbers Time Limit:1000MS Memory Limit:65536KB 64bit IO Format:%lld & %llu Description Some positive integers can be represented by a sum of one or more consecutive prime numbers. How many such representati…
Prime Query Time Limit: 1 Second Memory Limit: 196608 KB You are given a simple task. Given a sequence A[i] with N numbers. You have to perform Q operations on the given sequence. Here are the operations: A v l, add the value v to element with index…
By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13. What is the 10 001st prime number? 译文: 观察第一组质数可知,第6位质数为13,那么第10001位质数是多少呢? ============================ 第一次code: import java.util.ArrayList; import j…
Your task is simple:Find the first two primes above 1 million, whose separate digit sums are also prime.As example take 23, which is a prime whose digit sum, 5, is also prime.The solution is the concatination of the two numbers,Example: If the first…
