Compilare: main.cpp: In member function 'void Trie::insert(std::__cxx11::string&, int)': main.cpp:21:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k >= s.size()) ~~^~~~~~~~~~~ main.cpp:29:17: warning: array subscript has type 'char' [-Wchar-subscripts] if (children[c] == NULL) ^ main.cpp:30:14: warning: array subscript has type 'char' [-Wchar-subscripts] children[c] = new Trie(); ^ main.cpp:33:13: warning: array subscript has type 'char' [-Wchar-subscripts] children[c]->insert(s, k + 1); ^ main.cpp: In member function 'void Trie::remove(std::__cxx11::string&, int, bool&)': main.cpp:38:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k >= s.size()) ~~^~~~~~~~~~~ main.cpp:47:17: warning: array subscript has type 'char' [-Wchar-subscripts] if (children[c] == NULL) ^ main.cpp:50:17: warning: array subscript has type 'char' [-Wchar-subscripts] if (children[c]->subTreeWordCount == 0 && children[c]->nrEnding == 0) ^ main.cpp:50:55: warning: array subscript has type 'char' [-Wchar-subscripts] if (children[c]->subTreeWordCount == 0 && children[c]->nrEnding == 0) ^ main.cpp:53:13: warning: array subscript has type 'char' [-Wchar-subscripts] children[c]->remove(s, k + 1, didRemove); ^ main.cpp: In member function 'int Trie::count(std::__cxx11::string&, int)': main.cpp:60:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == s.size()) ~~^~~~~~~~~~~ main.cpp:65:17: warning: array subscript has type 'char' [-Wchar-subscripts] if (children[c] == NULL) ^ main.cpp:68:20: warning: array subscript has type 'char' [-Wchar-subscripts] return children[c]->count(s, k + 1); ^ main.cpp: In member function 'int Trie::longestPrefix(std::__cxx11::string&, int)': main.cpp:76:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == s.size() || children[c] == NULL) ~~^~~~~~~~~~~ main.cpp:76:34: warning: array subscript has type 'char' [-Wchar-subscripts] if (k == s.size() || children[c] == NULL) ^ main.cpp:79:17: warning: array subscript has type 'char' [-Wchar-subscripts] if (children[c]->nrEnding == 0 && children[c]->subTreeWordCount == 0) ^ main.cpp:79:47: warning: array subscript has type 'char' [-Wchar-subscripts]