Compilare: user.cpp: In function ‘int rollingHash(std::string, int)’: user.cpp:25:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:46:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < pattern.size(); i++) ^ user.cpp:51:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < pattern.size() - 1; i++) ^ user.cpp:57:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = pattern.size() - 1; i < text.size(); i++) ^ user.cpp:73:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < matches.size(); i++) ^