Compilare: main.cpp: In member function 'void trie::add(std::string&, int)': main.cpp:26:25: warning: array subscript has type 'char' [-Wchar-subscripts] 26 | if (nxt[toInt[s[ind]]] == nullptr) { | ^ main.cpp:27:23: warning: array subscript has type 'char' [-Wchar-subscripts] 27 | nxt[toInt[s[ind]]] = new trie(); | ^ main.cpp:29:21: warning: array subscript has type 'char' [-Wchar-subscripts] 29 | nxt[toInt[s[ind]]]->add(s, ind + 1); | ^ main.cpp: In member function 'void trie::query(std::string&)': main.cpp:44:18: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'unsigned int'} and 'int' [-Wsign-compare] 44 | if (s.size() == k) | ~~~~~~~~~^~~~ main.cpp:49:37: warning: array subscript has type 'char' [-Wchar-subscripts] 49 | if (dp == (nxt[toInt[toBeaten[c]]] == nullptr | ^ main.cpp:49:38: warning: array subscript has type 'char' [-Wchar-subscripts] 49 | if (dp == (nxt[toInt[toBeaten[c]]] == nullptr | ~~~~~~~~~~^ main.cpp:51:43: warning: array subscript has type 'char' [-Wchar-subscripts] 51 | : nxt[toInt[toBeaten[c]]]->stop) * | ^ main.cpp:51:44: warning: array subscript has type 'char' [-Wchar-subscripts] 51 | : nxt[toInt[toBeaten[c]]]->stop) * | ~~~~~~~~~~^ main.cpp:53:32: warning: array subscript has type 'char' [-Wchar-subscripts] 53 | (nxt[toInt[c]] == nullptr ? 0 : nxt[toInt[c]]->dp)) { | ^ main.cpp:53:63: warning: array subscript has type 'char' [-Wchar-subscripts] 53 | (nxt[toInt[c]] == nullptr ? 0 : nxt[toInt[c]]->dp)) { | ^ main.cpp:57:19: warning: array subscript has type 'char' [-Wchar-subscripts] 57 | if (nxt[toInt[res]] == nullptr) | ^~~ main.cpp:58:17: warning: array subscript has type 'char' [-Wchar-subscripts] 58 | nxt[toInt[res]] = new trie(); | ^~~ main.cpp:60:15: warning: array subscript has type 'char' [-Wchar-subscripts] 60 | nxt[toInt[res]]->query(s); | ^~~