Compilare: main.cpp: In member function 'TrieNode* Trie::insert(TrieNode*, std::string&, int)': main.cpp:29:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 29 | if(s.size() == ind) { | ~~~~~~~~~^~~~~~ main.cpp: In member function 'int Trie::_search(TrieNode*, std::string&, int)': main.cpp:48:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 48 | if(s.size() == ind) return nod->frecventa; | ~~~~~~~~~^~~~~~ main.cpp: In member function 'TrieNode* Trie::erase(TrieNode*, std::string&, int)': main.cpp:65:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 65 | if(s.size() == ind) { | ~~~~~~~~~^~~~~~ main.cpp: In member function 'std::string Trie::find_lcp(std::string)': main.cpp:117:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 117 | for(int i = 0; i < s.size() && current_node != nullptr; i++) { | ~~^~~~~~~~~~