Submission

Score: 100

User: bananakung

Problemset: Twin, Cousin, and Sexy Prime

Language: cpp

Time: 0.501 second

Submitted On: 2025-09-04 20:24:23

#include<bits/stdc++.h>
using namespace std;
bool prime[70000010];
int main()
{
	prime[0]=1;
	prime[1]=1;
	int s,e,ans[3]={};
	cin>>s>>e;
	for(int i=2;i<=e+6;i++)
	{
		if(prime[i]==0)
		{
			for(int j=i*2;j<=e+6;j+=i)
			{
				prime[j]=1;
			}
		}	
	}
	for(int i=s;i<=e;i++)
	{
		if(prime[i]==0)
		{
			if(prime[i+2]==0) ans[0]++;
			else if(prime[i-2]==0&&i>2) ans[0]++;
			
			if(prime[i+4]==0) ans[1]++;
			else if(prime[i-4]==0&&i>4) ans[1]++;
			
			if(prime[i+6]==0) ans[2]++;
			else if(prime[i-6]==0&&i>6) ans[2]++;
		}
	}
	cout<<ans[0]<<endl;
	cout<<ans[1]<<endl;
	cout<<ans[2]<<endl;
	
}