제출 #253588

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
253588		egekabas	Lutrija (COCI19_lutrija)	C++14	7 / 70	1 ms	384 KiB

lutrija

#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pull;
typedef pair<ll, ll> pii;
typedef pair<ld, ld> pld;
ll isprime(ll x){
    if(x == 0 || x == 1) return 0;
    for(ll i = 2; i*i <= x; ++i)
        if(x%i == 0)
            return 0;
    return 1;
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    //freopen("in.txt", "r", stdin);
    //freopen("out.txt", "w", stdout);
    
    ll a, b;
    cin >> a >> b;
    if(a == 2 && b == 2)
        cout << "3\n2 5 2\n";
    else if(a == 2)
        cout << "3\n2 " << b+2 << ' ' << b << '\n';
    else if(b == 2)
        cout << "3\n" << a << ' ' << a+2 << " 2\n";
    else{
        if(abs(a-b) == 2)
            cout << "2\n" << a << ' ' << b << '\n'; 
        else if(isprime(a-2) && isprime(b-2))
            cout << 3 << '\n' << a << " 2 " << b << '\n';
        else
            cout << "-1\n";
    }
}

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