Compilare: user.cpp: In function ‘void Prefix()’: user.cpp:15:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < A.size(); i ++) ^ user.cpp: In function ‘void KMP()’: user.cpp:27:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < B.size(); i ++) ^ user.cpp:31:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == A.size()) ^