func_code_string: #include <bits/stdc++.h>   using namespace std;   int lim = 1e6;   int inf = 1e8;   void err(istream_iterator<string> it) { cerr << endl; }   template <typename T, typename... Args>   void err(istream_iterator<string> it, T a, Args... args) {     cerr << *it <<   =   << a <<   t ;     err(++it, args...);   }   template <typename T1, typename T2>   ostream& operator<<(ostream& c, pair<T1, T2>& v) {     c <<  (  << v.first <<  ,  << v.second <<  ) ;     return c;   }   template <template <class...> class TT, class... T>   ostream& operator<<(ostream& out, TT<T...>& c) {     out <<  {  ;     for (auto& x : c) out << x <<    ;     out <<  } ;     return out;   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int t;     cin >> t;     while (t--) {       int n;       cin >> n;       int ans = 0;       for (int i = 6; i >= 0; i--) {         int k = pow(2, i);         int j = 0;         vector<int> a, b;         for (int r = 1; r <= n; r++) {           if ((r / k) % 2 == 0) {             a.push_back(r);           } else {             b.push_back(r);           }         }         if (a.size() == 0 or b.size() == 0) continue;         cout << a.size() <<     << b.size() <<    ;         for (int j = 0; j < a.size(); j++) {           cout << a[j] <<    ;         }         for (int j = 0; j < b.size(); j++) {           cout << b[j] <<    ;         }         cout << endl;         int tmpans;         cin >> tmpans;         ans = max(ans, tmpans);       }       cout << -1 <<     << ans << endl;     }   }   