I recommend seeing this: https://en.wikipedia.org/wiki/Oscillator_(cellular_automaton)
In this problem, all he wants is how many steps are necessary for the automaton to repeat itself.
Which doors are open?
Find a Pythagorean triple
Perfect Square or not
Rubik's Cube: Solve Randomized Cube - Score : Moves
GJam 2014 China Rd B: Party
Play Tic Tac Toe : No Losses Allowed
Rubik's Cube: 30 Moves or Less: Minimum Avg Time
Binpack Contest: Retro - - Best Packing
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