Compilare: main.cpp: In function 'void prefix(char*, int*)': main.cpp:25:9: warning: unused variable 'i' [-Wunused-variable] int i; ^ main.cpp: In function 'void KMP(char*, char*)': main.cpp:35:16: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] s[n + 1] = NULL; ^~~~ main.cpp:33:9: warning: unused variable 'q' [-Wunused-variable] int q = 0; ^