BZOJ 1724 切割木板

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<queue>
#define maxn 50050
using namespace std;
long long n,x,ans=0;
priority_queue <long long,vector<long long>,greater<long long> > q;
int main()
{
    scanf("%lld",&n);
    for (long long i=1;i<=n;i++)
    {
        scanf("%lld",&x);
        q.push(x);
    }
    while (q.size()!=1)
    {
        long long a=q.top();q.pop();
        long long b=q.top();q.pop();
        ans+=a+b;q.push(a+b);
    }
    printf("%lld\n",ans);
    return 0;
}