func_code_string: #include <bits/stdc++.h>    using namespace std;      using ll = long long;   using ld = long double;   #define fi first   #define se second      void solve(){    ll n;    cin>>n;    vector<ll>d(n);    for(int i=0;i<n;i++)     cin>>d[i];    ll ans=0,curr=0;    sort(d.begin(),d.end());    for(int i=1;i<d.size()-1;i++){     ans+=(i*d[i])-curr;     curr+=d[i];    }    ll l = d.size();    if(l>=3)     ans+=((l-2)*d[l-1])-curr;    cout<<-1*ans<<  n ;   }      int main()    {     ios::sync_with_stdio(false);    cin.tie(0);       int t;    cin>>t;    while(t--){     solve();    }        return 0;    }      