Particle Accelerator II

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <climits>
#include <queue>

typedef long long ll;

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    // freopen("input.txt", "r", stdin); // TODO: REMOVE THIS YOU STUPID ****

    int n;
    cin >> n;

    priority_queue<ll,vector<ll>,greater<>> particles;
    for (int i = 0; i < n; i++) {
        ll x;
        cin >> x;
        particles.push(x);
    }
    ll ans = 0;
    while (particles.size() >= 2) {
        ll a = particles.top(); particles.pop();
        ll b = particles.top(); particles.pop();
        ans += a*b;
        particles.push(a+b);
    }
    cout << ans;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED