Compilare: main.cpp: In function 'int Hash(std::__cxx11::string, const int&, const int&)': main.cpp:27:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < str.size(); i++) ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:60:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < a.size(); i++) ~~^~~~~~~~~~ main.cpp:68:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = a.size(); i < b.size(); i++) ~~^~~~~~~~~~