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leetcode
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/*
1367. 二叉树中的列表
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。
示例 1:
输入:head = [4,2,8], root = [1,4,4,null,2,2,null,1,null,6,8,null,null,null,null,1,3]
输出:true
解释:树中蓝色的节点构成了与链表对应的子路径。
示例 2:
输入:head = [1,4,2,6], root = [1,4,4,null,2,2,null,1,null,6,8,null,null,null,null,1,3]
输出:true
示例 3:
输入:head = [1,4,2,6,8], root = [1,4,4,null,2,2,null,1,null,6,8,null,null,null,null,1,3]
输出:false
解释:二叉树中不存在一一对应链表的路径。
提示:
二叉树和链表中的每个节点的值都满足 1 <= node.val <= 100 。
链表包含的节点数目在 1 到 100 之间。
二叉树包含的节点数目在 1 到 2500 之间。
*/
public class Solution_1367 {
public static void main(String[] args) {
}
public boolean isSub(ListNode head, TreeNode root) {
if (head == null)
return true;
if (root == null)
return false;
if (head.val != root.val)
return false;
return isSub(head.next, root.left) || isSub(head.next, root.right);
}
public boolean isSubPath(ListNode head, TreeNode root) {
if (head == null)
return true;
if (root == null)
return false;
return isSub(head, root) || isSubPath(head, root.left) || isSubPath(head, root.right);
}
}
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