给你一棵以
root
为根的二叉树和一个 head
为第一个节点的链表。如果在二叉树中,存在一条一直向下的路径,且每个点的数值恰好一一对应以 head
为首的链表中每个节点的值,那么请你返回 True
,否则返回 False
。
一直向下的路径的意思是:从树中某个节点开始,一直连续向下的路径。
# Definition for singly-linked list. # class ListNode: # def __init__(self, val=0, next=None): # self.val = val # self.next = next # Definition for a binary tree node. # class TreeNode: # def __init__(self, val=0, left=None, right=None): # self.val = val # self.left = left # self.right = right class Solution:def dfs(self, head: ListNode, rt: TreeNode) -> bool:if not head:return Trueif not rt:return Falseif rt.val != head.val:return Falsereturn self.dfs(head.next, rt.left) or self.dfs(head.next, rt.right)def isSubPath(self, head: Optional[ListNode], root: Optional[TreeNode]) -> bool:if not root:return Falsereturn self.dfs(head, root) or self.isSubPath(head, root.left) or self.isSubPath(head, root.right)