Compilare: main.cpp: In function 'int hasher_one(std::__cxx11::string)': main.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s.size(); ++i) { ~~^~~~~~~~~~ main.cpp: In function 'int hasher_two(std::__cxx11::string)': main.cpp:42:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s.size(); ++i) { ~~^~~~~~~~~~ main.cpp: In function 'std::vector<int> solve(std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >)': main.cpp:81:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= s.size() - pattern.size(); ++i) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~