Compilare: main.cpp: In function 'int main()': main.cpp:70:32: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized] sol.push_back(make_pair(x, y)); ~~~~~~~~~^~~~~~ main.cpp:51:66: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] cout << "? " << x << " " << m << " " << x - 1 << " " << nMax << '\n'; ^~~