Compilare: main.cpp: In function 'void add(Tnode*, std::string, int)': main.cpp:17:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | if (i==s.size()) { | ~^~~~~~~~~~ main.cpp: In function 'bool deletee(Tnode*, std::string, int)': main.cpp:28:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | if (i==s.size()) { | ~^~~~~~~~~~ main.cpp: In function 'void cntt(Tnode*, std::string, int)': main.cpp:50:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | if (i==s.size()) { | ~^~~~~~~~~~ main.cpp: In function 'void pref(Tnode*, std::string, int)': main.cpp:61:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | if (i==s.size()) { | ~^~~~~~~~~~