<commit_before># Red-black tree

[Link to article](http://www.growingwiththeweb.com/2012/12/data-structure-red-black-tree.html)

![Red-black tree image](http://www.growingwiththeweb.com/images/2012/12/09/rbt.png)<commit_msg>Fix links<commit_after># Red-black tree

[Link to article](http://www.growingwiththeweb.com/data-structures/red-black-tree/overview/)

![Red-black tree image](http://www.growingwiththeweb.com/images/data-structures/red-black-tree/rbt.svg)
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