func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int n, k;     vector<long long int> v;     cin >> n >> k;     long long int r;     for (long long int i = 0; i < n; i++) {       long long int a;       cin >> a;       v.push_back(a);     }     r = v[0] % k;     long long int mn = 10000000000000;     for (long long int i = 0; i < n; i++) {       if (v[i] % k != r) {         cout <<  -1 n ;         return 0;       }       mn = min(mn, v[i]);     }     long long int count = 0;     for (int i = 0; i < n; i++) {       count += (v[i] - mn) / k;     }     cout << count <<   n ;     return 0;   }   