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# Codility - Height of a binary search tree

from extratypes import Tree # library with types used in the task

def solution(T):

#print(T.x,T.l,T.r)

if T is None:

# Important when you do recursion is to properly handle the values according to the scenario. Returning 0 here would give improper results while returning -1 would be the correct solution

return -1

else:

return 1+max(solution(T.l),solution(T.r))