Daily Coding Problem: Problem #912 [Medium]

Good morning! Here's your coding interview problem for today.

This problem was asked by Yext.

Two nodes in a binary tree can be called cousins if they are on the same level of the tree but have different parents. For example, in the following diagram 4 and 6 are cousins.

    1
   / \
  2   3
 / \   \
4   5   6

Given a binary tree and a particular node, find all cousins of that node.

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