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.
Reverse the Words (not letters) of a String
Given a window, how many subsets of a vector sum positive
return row and column indices given 2 values which define a range
Magic - Faro Shuffle
Knots Contest: Minimum Knots (TestSuite)
Primes Faster for Large N
Usage of java.math : N Choose K with unlimited precision
Path Optimization thru N words : Time Optimization
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