Compilare: user.cpp: In function ‘std::vector<int> build_prefix(std::string)’: user.cpp:42:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < p.size(); i++) ^ user.cpp: In function ‘void KMP()’: user.cpp:62:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); i++) ^ user.cpp:65:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (k<pattern.size() && s[i] == pattern[k] ) ^ user.cpp:71:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == pattern.size()) ^