combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:54:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
54 | while (res.size() < N-1) {
| ~~~~~~~~~~~^~~~~
combo.cpp:63:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
63 | if (x == res.size()) {
| ~~^~~~~~~~~~~~~
combo.cpp:65:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
65 | } else if (x == res.size()+1) {
| ~~^~~~~~~~~~~~~~~
combo.cpp:67:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
67 | } else if (x == res.size()+2) {
| ~~^~~~~~~~~~~~~~~