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May 25, 2022 03:02 PM
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单值二叉树
如果二叉树每个节点都具有相同的值，那么该二叉树就是单值二叉树。只有给定的树是单值二叉树时，才返回
true；否则返回 false。给定树的节点数范围是 [1, 100]。每个节点的值都是整数，范围为 [0, 99] 。相关标签：树, 深度优先搜索, 广度优先搜索, 二叉树。Univalued Binary Tree
A binary tree is uni-valued if every node in the tree has the same value. Given the
root of a binary tree, return true if the given tree is uni-valued, or false otherwise. The number of nodes in the tree is in the range [1, 100]. 0 <= Node.val < 100. Related Topics: Tree, Depth-First Search, Breadth-First Search, Binary Tree.这题是单值二叉树，让我们判断一下二叉树里面是不是只有一种值，写个深度优先搜索非常容易判断！判断所有值是不是都等于根节点的值就可以了。