foo.c: In function 'main':
foo.c:22:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   22 |     scanf("%d%d",&n1,&n2);
      |     ^~~~~~~~~~~~~~~~~~~~~
foo.c:25:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   25 |         scanf("%d",&a[i]);
      |         ^~~~~~~~~~~~~~~~~
foo.c:29:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   29 |         scanf("%d",&b[i]);
      |         ^~~~~~~~~~~~~~~~~

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