Daily Coding Problem: Problem #842 [Medium]

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

This problem was asked by Google.

Invert a binary tree.

For example, given the following tree:

    a
   / \
  b   c
 / \  /
d   e f

should become:

  a
 / \
 c  b
 \  / \
  f e  d

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