Compilare: main.cpp: In function 'void ins(std::string)': main.cpp:30:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for (j=0; j<s.size(); j++) | ~^~~~~~~~~ main.cpp: In function 'std::string best(std::string)': main.cpp:53:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for (j=0; j<s.size(); j++) | ~^~~~~~~~~