foo.c: In function 'Insert':
foo.c:60:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
foo.c: In function 'main':
foo.c:65:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n1);
  ^~~~~~~~~~~~~~~~
foo.c:66:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n2);
  ^~~~~~~~~~~~~~~~
foo.c:69:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &A[k]);
   ^~~~~~~~~~~~~~~~~~
foo.c:73:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &B[j]);
   ^~~~~~~~~~~~~~~~~~

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