Submission #704759

#	Time	Username	Problem	Language	Result	Execution time	Memory
704759		becaido	Lutrija (COCI19_lutrija)	C++17	70 / 70	454 ms	320 KiB

lutrija

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,popcnt,sse4,abm")
#include <bits/stdc++.h>
using namespace std;

#ifdef WAIMAI
#define debug(HEHE...) cout << "[" << #HEHE << "] : ", dout(HEHE)
void dout() {cout << '\n';}
template<typename T, typename...U>
void dout(T t, U...u) {cout << t << (sizeof...(u) ? ", " : ""), dout(u...);}
#else
#define debug(...) 7122
#endif

#define ll long long
#define Waimai ios::sync_with_stdio(false), cin.tie(0)
#define FOR(x,a,b) for (int x = a, I = b; x <= I; x++)
#define pb emplace_back
#define F first
#define S second

ll A, B;

bool is_prime(ll x) {
    if (x <= 1) return 0;
    FOR (i, 2, sqrt(x)) if (x % i == 0) return 0;
    return 1;
}

void solve() {
    cin >> A >> B;
    if (is_prime(abs(A - B))) {
        cout << "2\n";
        cout << A << ' ' << B << '\n';
        return;
    }
    vector<ll> ans;
    ans.pb(A);
    if (A != 2) {
        bool f = 0;
        for (ll x : {A - 2, A, A + 2}) if (is_prime(x) && is_prime(abs(x - 2))) {
            if (x != A) ans.pb(x);
            f = 1;
            break;
        }
        if (!f) {
            cout << "-1\n";
            return;
        }
    }
    if (A != 2 && B != 2) ans.pb(2);
    if (B != 2) {
        bool f = 0;
        for (ll x : {B - 2, B, B + 2}) if (is_prime(x) && is_prime(abs(x - 2))) {
            if (x != B) ans.pb(x);
            f = 1;
            break;
        }
        if (!f) {
            cout << "-1\n";
            return;
        }
    }
    ans.pb(B);
    cout << ans.size() << '\n';
    for (ll x : ans) cout << x << ' ';
    cout << '\n';
}

int main() {
    Waimai;
    solve();
}

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 7 / 7
• Subtask 4: 7 / 7
• Subtask 5: 7 / 7
• Subtask 6: 7 / 7
• Subtask 7: 7 / 7
• Subtask 8: 7 / 7
• Subtask 9: 7 / 7
• Subtask 10: 7 / 7