foo.c: In function 'main':
foo.c:19:8: warning: unused variable 'n' [-Wunused-variable]
   19 |  int i,n,n2,a1[10000],a2[10000],n1,x,y;
      |        ^
foo.c:20:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   20 |  scanf("%d%d",&n1,&n2);
      |  ^~~~~~~~~~~~~~~~~~~~~
foo.c:22:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   22 |   scanf("%d",&a1[i]);
      |   ^~~~~~~~~~~~~~~~~~
foo.c:24:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   24 |   scanf("%d",&a2[i]);
      |   ^~~~~~~~~~~~~~~~~~

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