【這有幾部車?】
Height or Depth of Binary Tree - C++ Forum【這有幾部車?】 ok, height (or depth) of empty (or null) binary tree is ZERO and considered there is only one node in tree, then height of root node is zero but height of tree is one that means, the height of following tree is 4 and not 3 (its something not right on wiki...
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