Compilare: user.cpp: In function ‘void prefix()’: user.cpp:13:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=2;i<=strlen(s);i++) ^ user.cpp: In function ‘void kmp()’: user.cpp:24:11: warning: unused variable ‘k’ [-Wunused-variable] int i,k=0; ^ user.cpp: In function ‘int main()’: user.cpp:44:8: warning: statement is a reference, not call, to function ‘kmp’ [-Waddress] kmp; ^ user.cpp:44:8: warning: statement has no effect [-Wunused-value]