0993. Cousins in Binary Tree

https://leetcode.com/problems/cousins-in-binary-tree

Description

Given the root of a binary tree with unique values and the values of two different nodes of the tree x and y, return true if the nodes corresponding to the values x and y in the tree are cousins, or false otherwise.

Two nodes of a binary tree are cousins if they have the same depth with different parents.

Note that in a binary tree, the root node is at the depth 0, and children of each depth k node are at the depth k + 1.

Example 1:

**Input:** root = [1,2,3,4], x = 4, y = 3
**Output:** false

Example 2:

**Input:** root = [1,2,3,null,4,null,5], x = 5, y = 4
**Output:** true

Example 3:

**Input:** root = [1,2,3,null,4], x = 2, y = 3
**Output:** false

Constraints:

• The number of nodes in the tree is in the range [2, 100].

• 1 <= Node.val <= 100

• Each node has a unique value.

• x != y

• x and y are exist in the tree.

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