func_code_string: #include<bits/stdc++.h>   using namespace std;   typedef long long ll;   typedef long double ld;   #define rep(a, b) for(ll a = 0; a < (b); ++a)   #define pb push_back   #define st first   #define nd second   #define all(a) a.begin(), a.end()   #define lg(a) (31-__builtin_clz(a))   void solve() {           int n;           cin >> n;           ll T[n];           rep(i, n) cin >> T[i];           sort(T, T+n);           ll ans=0, odejmij=0;           rep(i, n-1) ans+=T[i+1]-T[i];           rep(i, n) {                   ans-=i*T[i]-odejmij;                   odejmij+=T[i];           }           cout << ans <<   n ;   }   int main() {           ios_base::sync_with_stdio(0); cin.tie(0);           int _=1;           cin >> _;           while(_--) solve();   }   