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 = 0; i < s.size(); i++) ^ user.cpp:70:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == pattern.size()-1) ^ user.cpp:60:7: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] bool ok; ^ user.cpp:78:2: warning: label ‘_end’ defined but not used [-Wunused-label] _end: ^