Compilare: main.cpp: In member function 'void alphabet_t::add(char)': main.cpp:12:11: warning: array subscript has type 'char' [-Wchar-subscripts] 12 | remap[c] = size++; | ^ main.cpp: In function 'std::unordered_map<std::pair<int, int>, int, pairhash> build_automaton(const std::string&, const alphabet_t&)': main.cpp:53:44: warning: array subscript has type 'char' [-Wchar-subscripts] 53 | if (i < n && c == alphabet.remap[s[i]]) { | ^ main.cpp: In function 'int main()': main.cpp:95:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 95 | for (int i = 0; i < t.size(); i++) { | ~~^~~~~~~~~~ main.cpp:96:62: warning: array subscript has type 'char' [-Wchar-subscripts] 96 | auto it = aut.find(pair<int, int>{ q, alphabet.remap[t[i]] }); | ^ main.cpp:103:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | if (q == s.size()) { | ~~^~~~~~~~~~~ main.cpp:113:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 113 | for (int i = 0; i < ans.size(); i++) { | ~~^~~~~~~~~~~~