제출 #205708

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
205708		mayhoubsaleh	Lutrija (COCI19_lutrija)	C++14	14 / 70	181 ms	504 KiB

lutrija

#include <bits/stdc++.h>
#define pb push_back
#define ll long long
#define mid (l+r)/2
#define left 2*i+1
#define righ 2*i+2

using namespace std;
ll a,b;

bool check(ll x){
    if(x<=1)return 0;
    for(ll i=2;i*i<=x;i++){
        if(x%i)continue;
        return 0;
    }
    return 1;
}
int main()
{
    cin>>a>>b;
    if(abs(a-b)==2){
        cout<<2<<endl;
        cout<<a<<' '<<b<<endl;
        return 0;
    }
    if(a==2){
        if(check(b-2)){
            cout<<2<<endl;
            cout<<a<<' '<<b<<endl;
            return 0;
        }
        if(check(b+2)){
            cout<<3<<endl;
            cout<<a<<' '<<b+2<<' '<<b<<endl;
            return 0;
        }
    }
    if(b==2){
        if(check(a-2)){
            cout<<2<<endl;
            cout<<a<<' '<<b<<endl;
            return 0;
        }
        if(check(a+2)){
            cout<<3<<endl;
            cout<<a<<' '<<a+2<<' '<<b<<endl;
            return 0;
        }
    }

    if(check(a-2)){
        if(check(b-2)){
            cout<<3<<endl;
            cout<<a<<' '<<2<<' '<<b<<endl;
            return 0;
        }
        if(check(b+2)){
            cout<<4<<endl;
            cout<<a<<' '<<2<<' '<<b+2<<' '<<b<<endl;
            return 0;
        }
    }
    if(check(a+2)){
        if(check(b-2)){
            cout<<4<<endl;
            cout<<a<<' '<<a+2<<' '<<2<<' '<<b<<endl;
        }
        if(check(b+2)){
            cout<<5<<endl;
            cout<<a<<' '<<a+2<<' '<<2<<' '<<b+2<<' '<<b<<endl;
        }
    }
    cout<<-1<<endl;
    return 0;
}

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