struct _iobuf {
  int _cnt;
  unsigned char *_ptr;
  unsigned char *_base;
  int _bufsiz;
  short _flag;
  char _file;
}
;
struct mallinfo {
  int arena;
  int ordblks;
  int smblks;
  int hblks;
  int hblkhd;
  int usmblks;
  int fsmblks;
  int uordblks;
  int fordblks;
  int keepcost;
  int mxfast;
  int nlblks;
  int grain;
  int uordbytes;
  int allocated;
  int treeoverhead;
}
;
struct node {
  int value;
  struct node *left;
  struct node *right;
}
;