Compilare: user.cpp: In function ‘int hash(std::string)’: user.cpp:12: warning: comparison between signed and unsigned integer expressions user.cpp:9: warning: unused variable ‘base’ user.cpp: In function ‘std::vector<int, std::allocator<int> > rabin_karp(std::string, std::string)’: user.cpp:25: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:47: warning: comparison between signed and unsigned integer expressions