poj3253(优先队列)

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <queue>
using namespace std;
int N,R;
int x[50100];

int main()
{
#ifdef xxz
    freopen("in.txt","r",stdin);
#endif // xxz
    ios::sync_with_stdio(false);
    cin.tie(0);
    while(cin>>N)
    {
        priority_queue<int,vector<int>,greater<int> > P;

        for(int i = 0; i < N; i++)
        {
            cin>>x[i];
            P.push(x[i]);
        }

        long long  ans = 0;
        while(P.size() > 1)
        {
            int L1 = P.top();P.pop();
            int L2 = P.top();P.pop();
            ans += L1+L2;
            P.push(L1+L2);
        }
        cout<<ans<<endl;
    }
    return 0;
}