combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:13:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
13 | if(coins == s.size()){
| ~~~~~~^~~~~~~~~~~
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 | if(coins == s.size()){
| ~~~~~~^~~~~~~~~~~
combo.cpp:29:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
29 | if(coins == s.size()){
| ~~~~~~^~~~~~~~~~~
combo.cpp:37:14: 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(coins == s.size()){
| ~~~~~~^~~~~~~~~~~
combo.cpp:42:15: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
42 | if(p.size() == N) return p;
| ~~~~~~~~~^~~~
combo.cpp:8:19: warning: control reaches end of non-void function [-Wreturn-type]
8 | std::string s = "";
| ^~