제출 #319326

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
319326		gustason	Lutrija (COCI19_lutrija)	C++14	0 / 70	87 ms	388 KiB

lutrija

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
bool isPrime(ll n) {
    if (n < 2) 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(nullptr);
    ll A, B;
    cin >> A >> B;
    bool ok = 0;
    if (abs(A - B) == 2) {
        cout << 2 << "\n"
             << A << " " << B;
        ok = 1;
    } else {
        if (isPrime(B - 2) && isPrime(abs(A - (B - 2)))) {
            cout << 3 << "\n"
                 << A << " " << B - 2 << " " << B << "\n";
            ok = 1;
        } else if (isPrime(B + 2) && isPrime(abs(A - (B + 2)))) {
            cout << 3 << "\n"
                 << A << " " << B + 2 << " " << B << "\n";
            ok = 1;
        }
    }
    if (!ok) {
        cout << -1;
    }
    return 0;
}
//~ check for overflows

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