Compilare: main.cpp: In member function 'void RollingHash::init(const string&)': main.cpp:16:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.length(); i++) { ~~^~~~~~~~~~~~ main.cpp: In function 'std::tuple<bool, std::vector<int, std::allocator<int> > > rabin_karp(const string&, const string&)': main.cpp:53:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pattern.length(); i < text.length(); i++) { ~~^~~~~~~~~~~~~~~