Compilare: user.cpp: In function ‘void TrieInsert(std::string&)’: user.cpp:26:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0) ; i < s.length() ; ++i) ^ user.cpp:28:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (!node->node[s[i]]) ^ user.cpp:29:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] node->node[s[i]] = new struct Trie; ^ user.cpp:30:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] node = node->node[s[i]]; ^ user.cpp: In function ‘void Compute()’: user.cpp:65:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0) ; i < Pattern.length() ; ++i) ^ user.cpp:67:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (it != Automaton && !it->node[Pattern[i]]) ^ user.cpp:69:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (it->node[Pattern[i]]) ^ user.cpp:71:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] it = it->node[Pattern[i]]; ^ user.cpp: In function ‘int TrieQuery(std::string&)’: user.cpp:90:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0) ; i < s.length() ; ++i) ^ user.cpp:91:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] it = it->node[s[i]]; ^ user.cpp: In function ‘void Convert(std::string&)’: user.cpp:97:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0) ; i < s.length() ; ++i) ^