Compilare: user.cpp: In function ‘void prefix()’: user.cpp:11:17: warning: unused variable ‘k’ [-Wunused-variable] int i=1,j=0,k=0;; ^ user.cpp: In function ‘void KMP()’: user.cpp:41:25: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(txt[i]==pat[j]) ^ user.cpp:43:16: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] i++;j++; ^