AcWing 148. Merge fruit

#include <iostream>
#include <algorithm>
#include <queue>
using namespace std;
int main() {
    int n;
    scanf("%d", &n);
    priority_queue<int, vector<int>, greater<int>> heap;
    while (n -- ) {
        int x;
        scanf("%d", &x);
        heap.push(x);
    }
    int res = 0;
    while (heap.size() > 1) {
        int a = heap.top();
        heap.pop();
        int b = heap.top();
        heap.pop();
        res += a + b;
        heap.push(a + b);
    }
    printf("%d\n", res);
    return 0;
}