foo.c: In function 'main':
foo.c:42:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   42 |     scanf("%d%d%d",&n1,&n2,&n3);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:45:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   45 |     scanf("%d",&a[i]);
      |     ^~~~~~~~~~~~~~~~~
foo.c:47:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   47 |     scanf("%d",&b[i]);
      |     ^~~~~~~~~~~~~~~~~
foo.c:49:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   49 |     scanf("%d",&c[i]);
      |     ^~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务