prolog/problems/trees/depthbt_2/common.py


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# coding=utf-8

id = 140
number = 45
visible = False
facts = None

solution = '''\
depthBT(nil, 0).
depthBT(b(L, _, R), D) :-
  depthBT(L, DL),
  depthBT(R, DR),
  (DL >= DR,
   D is DL + 1
   ;
   DL < DR,
   D is DR + 1).
'''