Compilare: user.cpp: In function ‘int main()’: user.cpp:52:18: warning: statement has no effect [-Wunused-value] for(i;i<=n;i++) { niv[i]=x;a_cata[i]=++acata;} ^ user.cpp:55:14: warning: statement has no effect [-Wunused-value] for(i;i<=aux;i++) {niv[i]=x;a_cata[i]=++acata;} ^ user.cpp:49:13: warning: unused variable ‘auxxx’ [-Wunused-variable] int auxxx; ^