func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int T;     cin >> T;     while (T-- > 0) {       int N;       cin >> N;       struct MM {         int min, max;       };       MM data[129];       for (int i = 0; i <= 128; ++i) {         if (i >= 63 && i < 63 + N)           data[i] = {i - 62, i - 62};         else           data[i] = {0, 0};       }       for (int i = 62; i >= 0; --i) {         MM& fi = data[2 * i + 1];         MM& se = data[2 * i + 2];         if (se.min == 0) {           data[i] = fi;         } else {           string res;           if (fi.min == fi.max && se.min == se.max) {             cout <<  ?   << fi.min <<     << se.min << endl;             cout.flush();             cin >> res;             if (res ==  < )               data[i] = {fi.min, se.max};             else               data[i] = {se.min, fi.max};           } else {             cout <<  ?   << fi.min <<     << se.min << endl;             cout.flush();             cin >> res;             if (res ==  < )               data[i].min = fi.min;             else               data[i].min = se.min;             cout <<  ?   << fi.max <<     << se.max << endl;             cout.flush();             cin >> res;             if (res ==  > )               data[i].max = fi.max;             else               data[i].max = se.max;           }         }       }       cout <<  !   << data[0].min <<     << data[0].max << endl;       cout.flush();     }   }   