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  1. #include <iostream>
  2. #include <vector>
  3. #include <numeric>
  4.  
  5. using namespace std;
  6.  
  7. void solve() {
  8.     int n;
  9.     cin >> n;
  10.     vector<long long> a(n);
  11.     long long sum = 0;
  12.     for (int i = 0; i < n; ++i) {
  13.         cin >> a[i];
  14.         sum += a[i];
  15.     }
  16.  
  17.     if (sum % n != 0) {
  18.         cout << -1 << endl;
  19.         return;
  20.     }
  21.  
  22.     long long target = sum / n;
  23.     long long operations = 0;
  24.  
  25.     for (int i = 0; i < n; ++i) {
  26.         if (a[i] > target) {
  27.             long long diff = a[i] - target;
  28.             if (diff % 3 != 0) {
  29.                 cout << -1 << endl;
  30.                 return;
  31.             }
  32.             operations += diff / 3 * 2;
  33.         }
  34.     }
  35.  
  36.     cout << operations << endl;
  37. }
  38.  
  39. int main() {
  40.     int t;
  41.     cin >> t;
  42.     while (t--) {
  43.         solve();
  44.     }
  45.     return 0;
  46. }
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https://ideone.com/7afNCT
language:
C++ (gcc 8.3)
created:
21 hours ago
visibility:
public

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