foo.c: In function 'main':
foo.c:8:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n1, &n2);
  ^~~~~~~~~~~~~~~~~~~~~~~
foo.c:11:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
   ^~~~~~~~~~~~~~~~~~
foo.c:15:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &b[i]);
   ^~~~~~~~~~~~~~~~~~
foo.c: In function 'MergeSubs':
foo.c:50:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
foo.c: In function 'Insert':
foo.c:65:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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