foo.c: In function 'main':
foo.c:18:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   18 |     scanf("%d%d", &n1, &n2);
      |     ^~~~~~~~~~~~~~~~~~~~~~~
foo.c:20:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   20 |         scanf("%d",&s1[i]);
      |         ^~~~~~~~~~~~~~~~~~
foo.c:23:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   23 |         scanf("%d",&s2[i]);
      |         ^~~~~~~~~~~~~~~~~~

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