Compilare: main.cpp: In member function 'void node::Insert(const string&, int)': main.cpp:13:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | if (i == s.length()) ++cnt; | ~~^~~~~~~~~~~~~ main.cpp: In member function 'void node::Delete(const string&, int)': main.cpp:19:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | if (i == s.length()) --cnt; | ~~^~~~~~~~~~~~~ main.cpp: In member function 'int node::Number(const string&, int)': main.cpp:24:15: 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.length()) return cnt; | ~~^~~~~~~~~~~~~ main.cpp: In member function 'int node::Prefix(const string&, int)': main.cpp:30:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | if (i < s.length() && x.count(s[i]) && x[s[i]].cnt1 != 0) return x[s[i]].Prefix(s, i + 1) + 1; | ~~^~~~~~~~~~~~