combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:8:15: error: 'press' was not declared in this scope
8 | int ans = press("AB");
| ^~~~~
combo.cpp:34:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
34 | if (ans == ret.size() + 1)
| ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:36:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
36 | else if (ans == ret.size() + 2)
| ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:38:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
38 | else if (ans == ret.size())
| ~~~~^~~~~~~~~~~~~
combo.cpp:44:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
44 | if (ans == ret.size() + 1)
| ~~~~^~~~~~~~~~~~~~~~~