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admin 11月 14, 2020 0

简述

前序遍历 N 叉树
n-ary-tree-preorder-traversal 英文中文

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代码

"""
# Definition for a Node.
class Node(object):
    def __init__(self, val, children):
        self.val = val
        self.children = children
"""
class (object):
    def preorder(self, root):
        """
        :type root: Node
        :rtype: List[int]
        """
        if root is None:
            return []
        
        stack, output = [root, ], []            
        while stack:
            root = stack.pop()
            output.append(root.val)
            stack.extend(root.children[::-1])
                
        return output