Compilare: main.cpp: In function 'void Add(Trie*, std::__cxx11::string&, int)': main.cpp:49:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == str.size()) ~~~~^~~~~~~~~~~~~ main.cpp:54:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == str.size() - 1) ~~~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void Erase(Trie*, std::__cxx11::string&, int)': main.cpp:63:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == str.size()) ~~~~^~~~~~~~~~~~~ main.cpp:73:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == str.size() - 1) ~~~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void Query(Trie*, std::__cxx11::string&, int)': main.cpp:79:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == str.size()) ~~~~^~~~~~~~~~~~~ main.cpp: In function 'void Prefix(Trie*, std::__cxx11::string&, int)': main.cpp:93:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == str.size()) ~~~~^~~~~~~~~~~~~