foo.c: In function 'main':
foo.c:7:17: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
    7 |         scanf("%s",&arr);
      |                ~^  ~~~~
      |                 |  |
      |                 |  char (*)[100]
      |                 char *

[Hydro](https://hydro.ac)提供评测服务