LeetCode #589: N-ary Tree Preorder Traversal
β’ 56 words β’ 1 min
LeetCode #589: N-ary Tree Preorder Traversal:
python
"""
# Definition for a Node.
class Node:
def __init__(self, val: Optional[int] = None, children: Optional[List['Node']] = None):
self.val = val
self.children = children
"""
class Solution:
def preorder(self, root: 'Node') -> List[int]:
ans = []
def dfs(node):
if node:
ans.append(node.val)
for child in node.children:
dfs(child)
dfs(root)
return ans