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Update bt_construct_inorder_preorder.py

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bt3gl 2023-08-08 14:47:15 -07:00 • committed by GitHub
parent e5efd5424a
commit dd98393aa4
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1 changed files with 2 additions and 3 deletions
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5
trees/bt_construct_inorder_preorder.py
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@ -10,11 +10,10 @@ def build_tree(preorder, inorder) -> Optional[Node]:
if left > right:
return None
root = Node(preorder.pop(0))
root = Node(preorder.pop(0)) # # this order change from postorder
index_here = index_map[root.val]
# this order change from postorder
root.left = helper(left, index_here - 1, index_map)
root.left = helper(left, index_here - 1, index_map) # this order change from postorder
root.right = helper(index_here + 1, right, index_map)
return root