foo.c: In function 'main':
foo.c:12:25: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
   12 |                 scanf("%d",a1[i]);
      |                        ~^  ~~~~~
      |                         |    |
      |                         |    int
      |                         int *
foo.c:17:25: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
   17 |                 scanf("%d",a2[i]);
      |                        ~^  ~~~~~
      |                         |    |
      |                         |    int
      |                         int *
foo.c:22:25: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
   22 |                 scanf("%d",a3[i]);
      |                        ~^  ~~~~~
      |                         |    |
      |                         |    int
      |                         int *

[Hydro](https://hydro.ac)提供评测服务