Lang:G++
Edit1234567891011121314151617181920#include<iostream>using namespace std;int main(){int n;cin>>n;bool a[n+5];for(int i=1;i<=n;++i)a[i]=true;for(int i=2;i<n;++i)if(a[i])for(int j=2;i*j<n;++j)a[i*j]=false;for(int i=1;i<n/2;++i)if(a[i]&&a[n-i]){cout<<i<<" "<<n-i;break;}return 0;}