Compilare: main.cpp: In member function 'int trie::find(std::string&)': main.cpp:20:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int i = 0; i < s.size(); i ++) { | ~~^~~~~~~~~~ main.cpp: In member function 'int trie::find2(std::string&)': main.cpp:30:26: 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(int i = 0; i < s.size(); i ++) { | ~~^~~~~~~~~~ main.cpp: In member function 'void trie::insert(std::string&)': main.cpp:40:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for(int i = 0; i < s.size(); i ++) { | ~~^~~~~~~~~~ main.cpp: In member function 'void trie::remove(std::string&)': main.cpp:51:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int i = 0; i < s.size() && n->cnt; i ++) { | ~~^~~~~~~~~~