- https://en.m.wikipedia.org/wiki/K-nearest_neighbors_algorithm
- http://www.dgp.toronto.edu/~flaps/progprobs.html
- https://en.wikipedia.org/wiki/Nim#Mathematical_theory
- https://www.youtube.com/watch?v=nBoQnTRCU18
- http://rosettacode.org/wiki/Category:Programming_Tasks
- I don't actually know what this game is called, but the one where you have to implement a sorting rule?