Compilare: user.cpp: In member function ‘void Trie::CreateTrie(std::__cxx11::string, int, Node*&)’: user.cpp:23:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pCurr != S.size()) { ~~~~~~^~~~~~~~~~~ user.cpp:34:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pCurr != S.size()) { ~~~~~~^~~~~~~~~~~ user.cpp:39:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < NCurr->a.size() && !Found; ++ i) { ~~^~~~~~~~~~~~~~~~~ user.cpp: In member function ‘int Trie::getCountNumber(std::__cxx11::string, int, Node*)’: user.cpp:59:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pCurr == S.size() ) { ~~~~~~^~~~~~~~~~~ user.cpp:65:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < NCurr -> a.size() && !Found; ++ i) { ~~^~~~~~~~~~~~~~~~~~~ user.cpp: In member function ‘void Trie::deleteCurrentWord(std::__cxx11::string, int, Node*)’: user.cpp:79:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pCurr == S.size() ) { ~~~~~~^~~~~~~~~~~ user.cpp:85:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < NCurr -> a.size() && !Found; ++ i) { ~~^~~~~~~~~~~~~~~~~~~ user.cpp: In member function ‘int Trie::getCommonPrefix(std::__cxx11::string, int, Node*)’: user.cpp:95:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pCurr == S.size()) { ~~~~~~^~~~~~~~~~~ user.cpp:104:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < NCurr -> a.size() && !Found; ++ i) { ~~^~~~~~~~~~~~~~~~~~~ user.cpp: In member function ‘int Trie::getCountNumber(std::__cxx11::string, int, Node*)’: user.cpp:76:5: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In member function ‘int Trie::getCommonPrefix(std::__cxx11::string, int, Node*)’: user.cpp:116:5: warning: control reaches end of non-void function [-Wreturn-type] } ^