foo.c: In function 'main':
foo.c:12:5: error: 'i' undeclared (first use in this function)
 for(i=0;i<n;i++)
     ^
foo.c:12:5: note: each undeclared identifier is reported only once for each function it appears in
foo.c: In function 'Moveleft':
foo.c:22:7: error: 'ii' undeclared (first use in this function); did you mean 'i'?
  for (ii=0;ii<n;ii++)
       ^~
       i
foo.c:16:6: warning: variable 'b' set but not used [-Wunused-but-set-variable]
 {int b[10000];
      ^
foo.c: In function 'main':
foo.c:4:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result]
 {freopen("test.txt","w",stdout);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:7:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&n);
 ^~~~~~~~~~~~~~
foo.c:9:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&a[i]);
     ^~~~~~~~~~~~~~~~~
foo.c:10:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&k) ;
 ^~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务