Compilare: main.cpp: In member function 'void trie::add(std::string&, int, node*)': main.cpp:27:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | if(poz == s.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In member function 'void trie::del(std::string&, int, node*)': main.cpp:43:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | if(poz == s.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In member function 'int trie::number_of_apperances(std::string&, int, node*)': main.cpp:52:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | if(poz == s.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In member function 'void trie::find_longest_common_prefix(std::string&, int, node*, int&)': main.cpp:63:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | if(poz == s.size()){ | ~~~~^~~~~~~~~~~