Compilare: user.cpp: In function ‘void fill_coada(int)’: user.cpp:16:15: warning: unused variable ‘i’ [-Wunused-variable] int pr,ul,i,y,z; ^ user.cpp: In function ‘int main()’: user.cpp:52:15: warning: statement has no effect [-Wunused-value] viz[i]==-1; ^