Compilare: user.cpp: In function ‘void AddWord()’: user.cpp:51:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < word.size(); ++i) ^ user.cpp: In function ‘bool DeleteWord(int, Trie*)’: user.cpp:65:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == word.size()) ^ user.cpp: In function ‘int FindWord()’: user.cpp:89:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < word.size(); ++i) ^ user.cpp: In function ‘int PreffixLength()’: user.cpp:101:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < word.size(); ++i) ^