foo.c: In function 'main':
foo.c:30:17: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'char *' [-Wformat=]
   30 |         scanf("%d", a); scanf("%d", &n);
      |                ~^   ~
      |                 |   |
      |                 |   char *
      |                 int *
      |                %hhd

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