Compilare: main.cpp: In member function 'void Trie::insert(std::string)': main.cpp:20:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | while(i < s.size() && comp->children.find(s[i]) != comp->children.end()){ | ~~^~~~~~~~~~ main.cpp:25:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | while(i < s.size()){ | ~~^~~~~~~~~~ main.cpp: In member function 'TrieNode* Trie::exists(std::string)': main.cpp:38:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | while(i < s.size()){ | ~~^~~~~~~~~~ main.cpp: In member function 'int Trie::longest_prefix(std::string)': main.cpp:71:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | while(i < s.size() && comp->children.find(s[i]) != comp->children.end()){ | ~~^~~~~~~~~~ main.cpp: In member function 'int Trie::count(std::string)': main.cpp:87:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 87 | while(i < s.size()){ | ~~^~~~~~~~~~