func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       int n, k;       cin >> n >> k;       vector<int> s[k];       for (int i = 0; i < k; ++i) {         int c;         cin >> c;         for (int j = 0; j < c; ++j) {           int p;           cin >> p;           s[i].push_back(p);         }       }       cout <<  ?   << n <<    ;       for (int i = 1; i <= n; i++) cout << i <<    ;       cout <<   n ;       int max;       cin >> max;       int l = 1, r = n;       while (l < r) {         int mid = (l + r) / 2;         cout <<  ?   << mid - l + 1 <<    ;         for (int i = l; i <= mid; i++) cout << i <<    ;         cout <<   n ;         int temp;         cin >> temp;         if (temp == max)           r = mid;         else           l = mid + 1;       }       int sind = 0;       for (int i = 0; i < k; ++i) {         for (int j : s[i]) {           if (j == l) {             sind = i;             break;           }         }       }       int smax;       cout <<  ?   << n - s[sind].size() <<    ;       for (int i = 1; i <= n; i++) {         bool flag = true;         for (int j : s[sind])           if (j == i) flag = false;         if (flag) cout << i <<    ;       }       cout <<   n ;       cin >> smax;       cout <<  !  ;       for (int i = 0; i < k; i++) {         if (i == sind)           cout << smax <<    ;         else           cout << max <<    ;       }       cout <<   n ;       string x;       cin >> x;     }   }   