Compilare: main.cpp: In function 'void add(Tnode*, std::string, int)': main.cpp:22:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | if(i == s.size()){ | ~~^~~~~~~~~~~ main.cpp: In function 'bool del(Tnode*, std::string, int)': main.cpp:36:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | if(i == s.size()) | ~~^~~~~~~~~~~ main.cpp: In function 'int num_word(Tnode*, std::string, int)': main.cpp:66:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | if(i == s.size()) | ~~^~~~~~~~~~~ main.cpp: In function 'int find_pref(Tnode*, std::string, int)': main.cpp:78:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | if(i == s.size()) | ~~^~~~~~~~~~~