Daily Coding Problem: Problem #1596 [Easy]

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

This problem was asked by Amazon.

A tree is symmetric if its data and shape remain unchanged when it is reflected about the root node. The following tree is an example:

        4
      / | \
    3   5   3
  /           \
9              9

Given a k-ary tree, determine whether it is symmetric.

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