제출 #256874

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
256874		dolijan	Lutrija (COCI19_lutrija)	C++14	0 / 70	1 ms	384 KiB

lutrija

#include <bits/stdc++.h>
typedef long long ll;
#define pb push_back;
using namespace std;
bool prost(ll n)
{
	if(n==1) return false;
	for(ll i=2;i*i<=n;i++)
	{
		if(n%i==0) return false;
	}
	return true;
}
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	ll a,b;
	cin>>a>>b;
	if(a==2)
	{
		if(prost(b-2))
		{
			cout<<2<<endl;
			cout<<2<<" "<<b<<endl;
		}
		else if(prost(b+2))
		{
			cout<<3<<endl;
			cout<<2<<" "<<b+2<<" "<<b<<endl;
		}
		else
		{
			cout<<-1<<endl;
		}
	}
	else if(a==3)
	{
		if(b==5)
		{
			cout<<2<<endl;
			cout<<3<<" "<<5<<endl;
		}
		else if(b==7)
		{
			cout<<3<<endl;
			cout<<3<<" "<<5<<" "<<7<<endl;
		}
		else
		{
			cout<<-1<<endl;
		}
	}
	else
	{
		if(abs(a-b)==2)
		{
			cout<<2<<endl;
			cout<<a<<" "<<b<<endl;
		}
		else
		{
			cout<<-1<<endl;
		}
	}
	return 0;
}

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