combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:28:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
28 | if (press(rez+"B")==rez.size()+1)
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~
combo.cpp:30:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
30 | else if (press(rez+"X")==rez.size()+1)
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~
combo.cpp:37:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
37 | if (press(rez+"A")==rez.size()+1)
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~
combo.cpp:39:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
39 | else if (press(rez+"X")==rez.size()+1)
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~
combo.cpp:46:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
46 | if (press(rez+"A")==rez.size()+1)
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~
combo.cpp:48:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
48 | else if (press(rez+"B")==rez.size()+1)
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~
combo.cpp:55:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
55 | if (press(rez+"A")==rez.size()+1)
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~
combo.cpp:57:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
57 | else if (press(rez+"B")==rez.size()+1)
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~