Compilare: user.cpp: In member function ‘void Trie::Add(std::string)’: user.cpp:31:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.length(); i++) ^ user.cpp:45:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == s.length() - 1) ^ user.cpp: In member function ‘int Trie::NumberOfOccurences(std::string)’: user.cpp:61:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < s.length(); i++) ^ user.cpp:69:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == s.length()) ^ user.cpp: In member function ‘int Trie::LogestCommonPrefix(std::string)’: user.cpp:79:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < s.length(); i++) ^ user.cpp: In member function ‘bool Trie::_remove(TrieNode*, std::string, TrieNode*)’: user.cpp:98:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.length(); i++) ^ user.cpp:118:2: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In member function ‘int Trie::NumberOfOccurences(std::string)’: user.cpp:73:2: warning: control reaches end of non-void function [-Wreturn-type] } ^