Compilare: main.cpp: In member function 'void TrieNode::insert(std::__cxx11::string, int)': main.cpp:17:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == s.size()) ~~~~~~^~~~~~~~~~~ main.cpp: In member function 'bool TrieNode::remove(std::__cxx11::string, int)': main.cpp:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == s.size()) ~~~~~~^~~~~~~~~~~ main.cpp: In member function 'int TrieNode::count(std::__cxx11::string, int)': main.cpp:49:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == s.size()) ~~~~~~^~~~~~~~~~~ main.cpp: In member function 'int TrieNode::prefix(std::__cxx11::string, int)': main.cpp:60:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == s.size()) ~~~~~~^~~~~~~~~~~ main.cpp: In member function 'bool TrieNode::remove(std::__cxx11::string, int)': main.cpp:45:5: warning: control reaches end of non-void function [-Wreturn-type] } ^