foo.c: In function 'main':
foo.c:13:9: warning: unused variable 'x' [-Wunused-variable]
   int n,x,k1,i1,k;
         ^
foo.c:14:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ^~~~~~~~~~~~~~
foo.c:15:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&i1);
  ^~~~~~~~~~~~~~~
foo.c:19:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&k1); 
   ^~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务