题解 | 哈夫曼编码

#include <iostream>
#include <queue>
using namespace std;

int main() {
    int n;
    cin >> n;
    priority_queue<long long, vector<long long>, greater<long long>> pq;
    
    for (int i = 0; i < n; ++i) {
        long long x;
        cin >> x;
        pq.push(x);
    }

    long long result = 0;
    while (pq.size() > 1) {
        long long a = pq.top(); pq.pop();
        long long b = pq.top(); pq.pop();
        result += a + b;
        pq.push(a + b);
    }

    cout << result << endl;
    return 0;
}