11 lines
289 B
Python
11 lines
289 B
Python
class Solution(object):
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def __init__(self):
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self.prev = None
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def flatten(self, root):
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if not root: return None
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self.flatten(root.right)
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self.flatten(root.left)
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root.right = self.prev
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root.left = None
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self.prev = root |