Compilare: main.cpp: In function 'bool verif(std::string)': main.cpp:12:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for (int i = 1; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'void bkt(std::string)': main.cpp:31:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (int i = 1; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'std::string combine(char, char)': main.cpp:25:1: warning: control reaches end of non-void function [-Wreturn-type] 25 | } | ^