Leetcode590. N-ary Tree Postorder Traversal
590. N-ary Tree Postorder Traversal
"""
# Definition for a Node.
class Node(object):
def __init__(self, val, children):
self.val = val
self.children = children
"""
class Solution(object):
def postorder(self, root):
"""
:type root: Node
:rtype: List[int]
"""
res=[]
if root==None:
return res
stack=[root]
while stack:
curr=stack.pop()
res.append(curr.val)
stack.extend(curr.children)
return res[::-1]
反思:1.列表的常见操作不熟悉
2.怎么用list来处理树结构,不知道
strategy:
1.用anki记忆一些list的常见操作
2.知道迭代和递归的区别
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