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11 lines
249 B
Python
11 lines
249 B
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# author: bt3gl
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def max_depth(root: Optional[TreeNode]) -> int:
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if root is None:
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return 0
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return max(max_depth(root.left) + 1, max_depth(root.right) + 1)
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