Compilare: main.cpp: In member function 'void Trie::erase(std::string&)': main.cpp:50:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for(int it = 0; it < s.size(); it++) { | ~~~^~~~~~~~~~ main.cpp: In member function 'int Trie::occ(std::string&)': main.cpp:64:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for(int it = 0; it < s.size(); it++) { | ~~~^~~~~~~~~~ main.cpp: In member function 'int Trie::longest(std::string&)': main.cpp:78:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | for(int it = 0; it < s.size(); it++) { | ~~~^~~~~~~~~~