/in/foo.c: In function 'main':
/in/foo.c:6:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%d%d",&n,&k);
  ^~~~~
/in/foo.c:6:2: warning: incompatible implicit declaration of built-in function 'scanf'
/in/foo.c:6:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
/in/foo.c:7:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i=0;i<n;i++)
  ^~~
/in/foo.c:9:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   c=a[k-1];
   ^
/in/foo.c:16:3: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   printf("%d ",a[i]);
   ^~~~~~
/in/foo.c:16:3: warning: incompatible implicit declaration of built-in function 'printf'
/in/foo.c:16:3: note: include '<stdio.h>' or provide a declaration of 'printf'