func_code_string: #include <bits/stdc++.h>   using namespace std;   long long po(long long x, long long y) {     if (y == 0)       return 1;     else       return x * po(x, y - 1);   }   vector<long long> a[7], b[7];   void solve(long long l, long long r, long long d) {     if (l == r) return;     long long m = (l + r) >> 1;     for (long long i = l; i <= m; i++) a[d].push_back(i);     for (long long i = m + 1; i <= r; i++) b[d].push_back(i);     solve(l, m, d + 1);     solve(m + 1, r, d + 1);   }   int32_t main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     long long t;     cin >> t;     while (t--) {       long long n;       cin >> n;       for (long long i = 0; i < 7; i++) {         a[i].clear();         b[i].clear();       }       solve(1, n, 0);       long long ans = 0;       for (long long i = 0; i < 7; i++) {         if (a[i].empty() || b[i].empty()) break;         cout << a[i].size() <<     << b[i].size() <<    ;         for (auto it : a[i]) cout << it <<    ;         for (auto it : b[i]) cout << it <<    ;         cout << endl;         long long x;         cin >> x;         ans = max(ans, x);       }       cout <<  -1   << ans << endl;     }     return 0;   }   