Compilare: user.cpp: In function ‘void create_automaton(const string&, int*)’: user.cpp:12:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<pattern.size(); i++){ ^ user.cpp: In function ‘std::list<int> find_matches(const string&, const string&, int*)’: user.cpp:26:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<text.size(); i++){ ^ user.cpp:33:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==pattern.size()){ ^