I recommend seeing this: https://en.wikipedia.org/wiki/Oscillator_(cellular_automaton)
It's similar to the previous one, but there are multiple automatons and the problem asks for the previous step to the current state.
Distance walked 3D
Project Euler: Problem 8, Find largest product in a large string of numbers
Twist 'n' Match
Create an n-by-n null matrix and fill with ones certain positions
Packing Santa's Sleigh: First Layer
Factorial: Unlimited Size : java.math
Loading/Expanding a ZIP file from File Exchange
USC Spring 2012 ACM: Armageddon
GJam 2015 Rd1B: Noisy Neighbors
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