combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:8:12: error: 'press' was not declared in this scope
8 | if(press("A")) return "A";
| ^~~~~
combo.cpp:13:11: error: 'press' was not declared in this scope
13 | int k=press("AB");
| ^~~~~
combo.cpp:26:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
26 | while(s.size()<n-1)
| ~~~~~~~~^~~~
combo.cpp:42:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
42 | while(s.size()<n-1)
| ~~~~~~~~^~~~
combo.cpp:58:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
58 | while(s.size()<n-1)
| ~~~~~~~~^~~~
combo.cpp:74:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
74 | while(s.size()<n-1)
| ~~~~~~~~^~~~