@[haungyuze114514](/user/1060751) priority_queue不香吗？
```cpp
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
priority_queue<int,vector<int>,greater<int>> pq;
ll n,x,ans=0;
cin>>n;
for(ll i=1;i<=n;i++) cin>>x,pq.push(x);
while(pq.size()>=2)
{
ans+=pq.top();
int y=pq.top();
pq.pop();
ans+=pq.top();
y+=pq.top();
pq.pop();
pq.push(y);
}
cout<<ans;
return 0;
}
```
by wanjiayang @ 2023-11-01 16:32:11