Compilare: user.cpp: In function ‘void init_hash()’: user.cpp:33:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < pattern.size(); ++i) ^ user.cpp:35:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < pattern.size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:50:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < pattern.size(); i++) ^ user.cpp:56:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < text.size(); ++i) ^ user.cpp:60:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i >= pattern.size()) ^ user.cpp:68:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i >= pattern.size() - 1 && hash_pattern1 == hash_text1 && hash_pattern2 == hash_text2) ^