Compilare: main.cpp: In member function 'void trie::ins(std::string&, int)': main.cpp:21:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | if(pos == a.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In member function 'void trie::stergere(std::string&, int)': main.cpp:40:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | if(pos == a.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In member function 'int trie::aparitii(std::string&, int)': main.cpp:58:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | if(pos == a.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In member function 'int trie::prefix(std::string&, int)': main.cpp:73:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 73 | if(pos == a.size()){ | ~~~~^~~~~~~~~~~