foo.c: In function 'main':
foo.c:6:18: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    6 |  int n1, n2, n3; scanf("%d%d%d", &n1, &n2, &n3);
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:7:45: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    7 |  int a1[10000]; for (int i = 0; i < n1; i++)scanf("%d", &a1[i]);
      |                                             ^~~~~~~~~~~~~~~~~~~
foo.c:8:45: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    8 |  int a2[10000]; for (int i = 0; i < n2; i++)scanf("%d", &a2[i]);
      |                                             ^~~~~~~~~~~~~~~~~~~
foo.c:9:45: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    9 |  int a3[10000]; for (int i = 0; i < n3; i++)scanf("%d", &a3[i]);
      |                                             ^~~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务