Compilare: user.cpp: In function ‘void init_hash()’: user.cpp:38:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < text.size(); ++i) ^ user.cpp:40:38: 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:65:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < text.size() - pattern.size() + 1; ++i) ^