Compilare: main.cpp: In function 'void Add(nod*, std::__cxx11::string, int)': main.cpp:23:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==word.size()) ~^~~~~~~~~~~~~ main.cpp: In function 'bool Erase(nod*, std::__cxx11::string, int)': main.cpp:43:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==word.size()) ~^~~~~~~~~~~~~ main.cpp: In function 'int Prefix(nod*, std::__cxx11::string, int)': main.cpp:72:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==word.size()) return 0; ~^~~~~~~~~~~~~ main.cpp: In function 'int Occurances(nod*, std::__cxx11::string, int)': main.cpp:81:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==word.size()) return root->occ; ~^~~~~~~~~~~~~