Compilare: main.cpp: In member function 'void Trie::insert(std::__cxx11::string&, int)': main.cpp:44:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(lev<s.size()){ ~~~^~~~~~~~~ main.cpp: In member function 'void Trie::adauga(std::__cxx11::string&, int)': main.cpp:54:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(lev<s.size()&&ptr->nxt[s[lev]-'a']!=nullptr){ ~~~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:102:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<s.size(); j++) ~^~~~~~~~~ main.cpp:107:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<s.size(); j++) ~^~~~~~~~~ main.cpp:114:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<s.size(); j++) ~^~~~~~~~~