Compilare: main.cpp: In function 'void add(Tnode*, std::string, int)': main.cpp:24:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | if(i == s.size()) | ~~^~~~~~~~~~~ main.cpp: In function 'bool del(Tnode*, std::string, int)': main.cpp:39:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | if(i == s.size()) | ~~^~~~~~~~~~~ main.cpp: In function 'int nrap(Tnode*, std::string, int)': main.cpp:64:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | if(i == s.size()) | ~~^~~~~~~~~~~ main.cpp: In function 'int lpref(Tnode*, std::string, int)': main.cpp:73:10: 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(i == s.size()) | ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:91:18: warning: unused variable 'k' [-Wunused-variable] 91 | bool k = del(nod, crt, 0); | ^