func_code_string: #include <iostream>   #include <vector>   #include <numeric>   #include <algorithm>      using namespace std;       int main(){       ios_base::sync_with_stdio(false);       cin.tie(NULL);       cout.tie(NULL);       int t;       cin >> t;       while(t--){           int n;           cin >> n;           vector<long long> a(n);           for (int i = 0; i < n; ++i){               cin >> a[i];           }           sort(a.begin(), a.end());           long long ans = 0;           for (int k = 1; k < n; ++k){               ans += a[k] * (2 * k + 1 - n);           }           ans -= a[n-1];                      cout << -ans << endl;       }   }