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19 lines
365 B
Python
19 lines
365 B
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# author: bt3gl
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def preorder(root: 'Node'):
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if root is None:
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return []
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stack, result = [root, ], []
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while stack:
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node = stack.pop()
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result.append(node.val)
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stack.extend(node.children[::-1])
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return result
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