func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, v[10004];   vector<array<int, 3> > ans;   void go(int x, int y, int z) {     v[x] -= x * z;     v[y] += x * z;     ans.push_back({x, y, z});   }   int main() {     int t;     cin >> t;     while (t--) {       ans.clear();       int sum = 0;       cin >> n;       for (int i = 1; i <= n; ++i) {         cin >> v[i];         sum += v[i];       }       if (sum % n) {         cout << -1 <<   n ;         continue;       }       for (int i = 2; i <= n; ++i) {         if (v[i] % i) {           go(1, i, i - v[i] % i);         }         go(i, 1, v[i] / i);       }       for (int i = 2; i <= n; ++i) {         go(1, i, sum / n);       }       assert((int)ans.size() <= 3 * n);       cout << ans.size() <<   n ;       for (auto &[x, y, z] : ans) {         cout << x <<     << y <<     << z <<   n ;       }     }     return 0;   }   