combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:44:15: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
44 | while(s.size()<N-1){
| ~~~~~~~~^~~~
combo.cpp:48:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
48 | if(ps==s.size())
| ~~^~~~~~~~~~
combo.cpp:51:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
51 | if(ps==s.size()+1)
| ~~^~~~~~~~~~~~
combo.cpp:54:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
54 | if(ps==s.size()+2)
| ~~^~~~~~~~~~~~
combo.cpp:58:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
58 | for(int k=0;k<a.size();k++){
| ~^~~~~~~~~