Compilare: user.cpp: In member function ‘void automaton::add_word(const string&, int)’: user.cpp:47:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i){ ^ user.cpp: In member function ‘void automaton::build_fails()’: user.cpp:72:67: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(k && !states[k].transitions[states[y].letter]) ^ user.cpp:75:58: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(states[k].transitions[states[y].letter]) ^ user.cpp:76:61: warning: array subscript has type ‘char’ [-Wchar-subscripts] k=states[k].transitions[states[y].letter]; ^ user.cpp: In member function ‘void automaton::run_automaton(const string&)’: user.cpp:95:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i){ ^ user.cpp:92:13: warning: unused variable ‘p’ [-Wunused-variable] int p; ^ user.cpp:94:19: warning: unused variable ‘steps’ [-Wunused-variable] long long steps=0; ^ user.cpp: In member function ‘void automaton::calc_final()’: user.cpp:111:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<states.size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:173:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<x.states.size();i++){ ^