func_code_string: #include <bits/stdc++.h>   using namespace std;   void per() { cerr << endl; }   template <typename Head, typename... Tail>   void per(Head H, Tail... T) {     cerr << H <<    ;     per(T...);   }   template <class T>   bool uin(T& a, T b) {     return a > b ? (a = b, true) : false;   }   template <class T>   bool uax(T& a, T b) {     return a < b ? (a = b, true) : false;   }   template <class U, class V>   ostream& operator<<(ostream& out, const pair<U, V>& a) {     return out <<  (  << a.first <<  ,   << a.second <<  ) ;   }   template <class U, class V>   istream& operator>>(istream& in, pair<U, V>& a) {     return in >> a.first >> a.second;   }   template <typename W,             typename T = typename enable_if<!is_same<W, string>::value,                                             typename W::value_type>::type>   ostream& operator<<(ostream& out, const W& v) {     out <<  {  ;     for (const auto& first : v) out << first <<  ,  ;     return out <<  } ;   }   template <class T>   void readArr(T from, T to) {     for (auto i = from; i != to; ++i) cin >> *i;   }   mt19937 mrand(1337);   unsigned int myRand32() { return mrand() & (unsigned int)(-1); }   unsigned long long myRand64() {     return ((unsigned long long)myRand32() << 32) ^ myRand32();   }   const int mod = 1000000007;   void add(int& a, int b) {     a += b;     if (a >= mod) a -= mod;   }   void dec(int& a, int b) {     a -= b;     if (a < 0) a += mod;   }   int mult(int a, int b) { return a * (long long)b % mod; }   int bp(int a, int b) {     int res = 1;     while (b > 0) {       if (b & 1) res = mult(res, a);       a = mult(a, a);       b >>= 1;     }     return res;   }   int main() {     int vl = 1, vr = 1000000000;     cout <<  ? 1 1  << endl;     int base1;     cin >> base1;     while (vl + 1 < vr) {       int vm = (vl + vr) >> 1;       cout <<  ? 1   << vm << endl;       int first;       cin >> first;       if (first == base1 - (vm - 1))         vl = vm;       else         vr = vm;     }     int y1 = vl;     int x1 = base1 - (y1 - 1) + 1;     cout <<  ? 1000000000 1  << endl;     int base2;     cin >> base2;     int x2 = 1000000000 - (base2 - (y1 - 1));     cout <<  ? 1 1000000000  << endl;     int base3;     cin >> base3;     int y2 = 1000000000 - (base3 - (x1 - 1));     cout <<  !   << x1 <<     << y1 <<     << x2 <<     << y2 << endl;   }   