Alkuluvut

input/code.cpp: In function 'bool brute(std::vector<long long int>&, ll)':
input/code.cpp:16:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for (int i = 0; i < q.size(); i++) {
      |                     ~~^~~~~~~~~~

#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;

bool is_prime(ll x) {
    for (ll i = 2; i*i < x; i++) {
        if (x%i == 0) return false;
    }
    return true;
}

bool brute(vector<ll> &v, ll base) {
    vector<ll> q;
    q.push_back(base);
    for (int i = 0; i < q.size(); i++) {
        base = q[i];
        for (ll x : v) {
            ll newbase = base * 10;
            newbase += x;
            if (newbase > (ll) 1e16) continue;
            if (is_prime(newbase)) {
                cout << "YES\n";
                cout << newbase << "\n";
                return true;
            }
            q.push_back(newbase);
        }
    }
    return false;
}

void testCase() {
    int k;
    cin >> k;
    vector<ll> v;
    bool fine = false;
    bool fine2 = false;
    for (int i = 0; i < k; i++) {
        int d;
        cin >> d;
        if (d%3 != 0) fine = true;
        if (d%2 != 0 && d != 5) fine2 = true;
        v.push_back(d);
    }
    if (!fine || !fine2) {
        cout << "NO\n";
        return;
    }
    ll base = 0;
    bool haszero = false;
    for (ll x : v) {
        if (x == 0) {
            haszero = true;
        } else {
            base *= 10;
            base += x;
        }
    }
    if (haszero) base *= 10;
    if (!brute(v, base)) cout << "NO\n";
}

 
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int t;
    cin >> t;
    for (int i = 0; i < t; i++) {
        testCase();
    }
}

Test 1

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 2

Group: 2, 3

Verdict: WRONG ANSWER

Test 3

Group: 3

Verdict: ACCEPTED