965. Univalued Binary Tree

965. Univalued Binary Tree

难度: Easy

刷题内容

原题连接

内容描述

```
A binary tree is univalued if every node in the tree has the same value.

Return true if and only if the given tree is univalued.

Example 1:

Input: [1,1,1,1,1,null,1]
Output: true
Example 2:

Input: [2,2,2,5,2]
Output: false

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