g0601_0700.s0652_find_duplicate_subtrees

Class Solution

java.lang.Object

g0601_0700.s0652_find_duplicate_subtrees.Solution

public class Solution
extends Object

652 - Find Duplicate Subtrees.

Medium

Given the root of a binary tree, return all duplicate subtrees.

For each kind of duplicate subtrees, you only need to return the root node of any one of them.

Two trees are duplicate if they have the same structure with the same node values.

Example 1:

Input: root = [1,2,3,4,null,2,4,null,null,4]

Output: 2,4],[4

Example 2:

Input: root = [2,1,1]

Output: 1

Example 3:

Input: root = [2,2,2,3,null,3,null]

Output: 2,3],[3

Constraints:

• The number of the nodes in the tree will be in the range [1, 10^4]
• -200 <= Node.val <= 200

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
List<TreeNode>	findDuplicateSubtrees(TreeNode root)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

findDuplicateSubtrees

public List<TreeNode> findDuplicateSubtrees(TreeNode root)