foo.c: In function 'main':
foo.c:6:17: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[1000000000]' [-Wformat=]
    6 |         scanf("%s",&arr);
      |                ~^  ~~~~
      |                 |  |
      |                 |  char (*)[1000000000]
      |                 char *

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