foo.c: In function 'main':
foo.c:24:33: warning: unused variable 'i' [-Wunused-variable]
   24 |     int a[10000],b[10000],n1,n2,i;
      |                                 ^
foo.c: In function 'Input':
foo.c:19:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   19 |   scanf("%d",&a[i]);
      |   ^~~~~~~~~~~~~~~~~
foo.c: In function 'main':
foo.c:25:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   25 |     scanf("%d %d",&n1,&n2);
      |     ^~~~~~~~~~~~~~~~~~~~~~

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