foo.c: In function 'main':
foo.c:34:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d", &n1, &n2,&n3);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:36:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a1[i]);
   ^~~~~~~~~~~~~~~~~~~
foo.c:38:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a2[i]);
   ^~~~~~~~~~~~~~~~~~~
foo.c:40:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a3[i]);
   ^~~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务