foo.c: In function 'main':
foo.c:11:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   11 |     scanf("%d%d", &n1, &n2);
      |     ^~~~~~~~~~~~~~~~~~~~~~~
foo.c:15:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   15 |         scanf("%d", &a1[i]);
      |         ^~~~~~~~~~~~~~~~~~~
foo.c:17:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   17 |         scanf("%d", &a2[i]);
      |         ^~~~~~~~~~~~~~~~~~~

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