Compilare: main.cpp: In function 'void make_prefix(std::__cxx11::string)': main.cpp:14:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < match.size(); ++i) ~~^~~~~~~~~~~~~~ main.cpp: In function 'void print_matches(std::__cxx11::string, std::__cxx11::string)': main.cpp:33:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < search.size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp:44:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (last_state == match.size()) ~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:73:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); ++i) ~~^~~~~~~~~~