Compilare: user.cpp: In function ‘void computeZfunction(int*, std::string)’: user.cpp:50:29: warning: unused variable ‘index’ [-Wunused-variable] int l, r, n = s.size(), index = 1, ok = 0; ^ user.cpp: In function ‘int main()’: user.cpp:82:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) ^ user.cpp:69:10: warning: unused variable ‘a’ [-Wunused-variable] char a; ^