combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:47:27: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
47 | while ( prefix.length() < N ) {
| ~~~~~~~~~~~~~~~~^~~
combo.cpp:55:45: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
55 | while( s.length() + append.length()+1 <= N*4 ) {
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
combo.cpp:62:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
62 | if ( n > prefix.length()) {
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:66:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
66 | if ( n > prefix.length()) {
| ~~^~~~~~~~~~~~~~~~~