prolog/problems/trees/numberbt_2/common.py


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# coding=utf-8

id = 139
number = 44
visible = True
facts = None

solution = '''\
numberBT(nil, 0).
numberBT(b(L, _, R), N) :-
  numberBT(L, LN),
  numberBT(R, RN),
  N is LN + RN + 1.
'''