Sum of difference

#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main()
{
int n;
cin>>n;
vector<int> v(n);
int sum = 0;
for(int i =0; i<n; i++){
    cin>>v[i];
    sum += v[i];
}
sort(v.begin() , v.end());
reverse(v.begin() , v.end());

int m = n-1,ans = 0;
for(int i=0; i<n; i++){
    ans += v[i]*(n - i);
    ans -= sum;
    sum -= v[i];
}
cout<<ans;
}