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# get the nodes at (d - 1) layer:

def addOneRow(self, root, v, d):

dummy, dummy.left = TreeNode(v), root

row = [dummy]

for _ in range(d - 1):

row = [kid for node in row for kid in (node.left, node.right) if kid]

for node in row:

node.left, node.left.left = TreeNode(v), node.left

node.right, node.right.right = TreeNode(v), node.right

return dummy.left