func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());     long long n, k;     cin >> n >> k;     string s;     long long lo = 1, hi = n;     while (1) {       long long mid = lo + hi >> 1;       if (hi - lo <= 50) {         long long guess = rng() % (hi - lo + 1) + lo;         cout << guess <<     << guess << endl;         cin >> s;         if (s ==  Yes ) exit(0);         lo = max(1ll, lo - k), hi = min(n, hi + k);         continue;       }       cout << lo <<     << mid << endl;       cin >> s;       if (s ==  Yes )         lo = max(lo - k, 1ll), hi = min(mid + k, n);       else         lo = max(mid - k, 1ll), hi = min(hi + k, n);     }   }   