combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:21:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
21 | for(int k=0;k<a.size();k++){
| ~^~~~~~~~~
combo.cpp:36:15: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
36 | while(s.size()<N-1){
| ~~~~~~~~^~~~
combo.cpp:39:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
39 | if(ps==s.size())
| ~~^~~~~~~~~~
combo.cpp:42:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
42 | if(ps==s.size()+1)
| ~~^~~~~~~~~~~~
combo.cpp:45:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
45 | if(ps==s.size()+2)
| ~~^~~~~~~~~~~~
combo.cpp:49:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
49 | for(int k=0;k<a.size();k++){
| ~^~~~~~~~~
combo.cpp:50:6: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
50 | if(k==a.size()-1){
| ~^~~~~~~~~~~~