Split prime number and eshield screening

Source: Internet
Author: User
Split prime number and
Time Limit: 1000 ms memory limit: 32768kb 64bit Io format: % i64d & % i64u



HDU 2098
Split an even number into two different prime numbers. How can we split them?

The input contains some positive even numbers. The value cannot exceed 10000, And the number cannot exceed 500. In case of 0, the input ends.

Returns the number of different prime numbers corresponding to each even number. Each result occupies one row.

Sample Input

Sample output
#include <iostream>#include<cstdio>#include<cstdlib>#include<cstring>#include<algorithm>#include<cmath>#include<queue>#include<deque>#define MAX 10007using namespace std;int n,ans;bool isprime[10007];void sieve(){    int p=0;    for(int i=0;i<MAX;i++)        isprime[i]=true;    isprime[0]=isprime[1]=false;    for(int i=2;i<MAX;i++)        {            if(isprime[i]){                for(int j=2*i;j<MAX;j+=i)                    isprime[j]=false;            }        }}int main(){    while(1){        ans=0; scanf("%d",&n);        if(n==0) break;        sieve();        for(int i=2;i<n/2;i++)        {            if(isprime[i]&&isprime[n-i])                ans++;        }        printf("%d\n",ans);    }    return 0;}

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.