foo.c:4:2: error: unknown type name 'bool'; did you mean '_Bool'?
  bool pd = 0;
  ^~~~
  _Bool
foo.c: In function 'main':
foo.c:11:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
   ^~~~~~~~~~~~~~~

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