Compilare: user.cpp: In function ‘void PREFIX()’: user.cpp:19:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2 ; i < strlen(A) ; ++ i) ^ user.cpp: In function ‘void KMP()’: user.cpp:34:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1 ; i < strlen(B) ; ++ i) ^ user.cpp:42:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Q == strlen(A) - 1) ^