Compilare: main.cpp: In member function 'void alphabet_t::add(char)': main.cpp:10:11: warning: array subscript has type 'char' [-Wchar-subscripts] 10 | remap[c] = size++; | ^ main.cpp: In function 'std::vector<std::vector<int> > build_automaton(const std::string&, const alphabet_t&)': main.cpp:44:44: warning: array subscript has type 'char' [-Wchar-subscripts] 44 | if (i < n && c == alphabet.remap[s[i]]) { | ^ main.cpp: In function 'int main()': main.cpp:83:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 83 | for (int i = 0; i < t.size(); i++) { | ~~^~~~~~~~~~ main.cpp:84:35: warning: array subscript has type 'char' [-Wchar-subscripts] 84 | q = aut[q][alphabet.remap[t[i]]]; | ^ main.cpp:85:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 85 | if (q == s.size()) { | ~~^~~~~~~~~~~ main.cpp:95:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 95 | for (int i = 0; i < ans.size(); i++) { | ~~^~~~~~~~~~~~