foo.c: In function 'main':
foo.c:12:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=k-1;i>0;i--)
  ^~~
foo.c:14:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   a[0]=x;
   ^
foo.c:8:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&k);
  ^~~~~~~~~~~~~~~~~~~
foo.c:10:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&a[i]);
  ^~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务