2018
AlgoRythmics
    https://www.youtube.com/channel/UCIqiLefbVHsOAXDAxQJH7Xw
2017
https://proglib.io/p/sort-algorithms/
    https://www.youtube.com/playlist?list=PLpEJybV8lp41a4DKtllcnqX6VYP7qVaDm
    https://www.youtube.com/playlist?list=PLpEJybV8lp42-yM5l9wnxa2-Qs7mTZKlP
    https://www.youtube.com/watch?v=4s-aG6yGGLU