Compilare: main.cpp: In function 'bool trio(std::string)': main.cpp:11:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 11 | for(int i = 0; i < s.length()/3; i++){ | ~~^~~~~~~~~~~~~~ main.cpp:14:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for(int i = (s.length()/3); i < (s.length()/3)*2; i++){ | ~~^~~~~~~~~~~~~~~~~~ main.cpp:17:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i = (s.length()/3)*2; i < s.length(); i++){ | ~~^~~~~~~~~~~~