/in/foo.cc: In function 'void Output(int*, int)':
/in/foo.cc:7:6: warning: value computed is not used [-Wunused-value]
   a[i];
   ~~~^
/in/foo.cc:7:6: warning: statement has no effect [-Wunused-value]
/in/foo.cc: In function 'int main()':
/in/foo.cc:21:17: warning: 'n' is used uninitialized in this function [-Wuninitialized]
  MoveLeft(a,n,k);
                 ^