[sdevonoes]

As a professional developer, if I am faced with the task of dealing with binary trees at work, I would never:

- implement my own binary tree

- implement my own "invert a binary tree" algorithm

Reasons:

- my own implementation would be way worse than any other open source implementation (which has been reviewed extensively) in terms of: performance, number of bugs, correctness

- it would be a hell to maintain for future developers that have to maintain my code

- it just makes sense. Well understood algorithms do not require re-implementation