foo.c: In function 'setinter':
foo.c:22:9: warning: unused variable 'j' [-Wunused-variable]
   int i,j,d[20000]={0};
         ^
foo.c: In function 'main':
foo.c:7:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d",&n1,&n2,&n3);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c: In function 'in':
foo.c:18:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&a[i]);
     ^~~~~~~~~~~~~~~~~

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