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reduce state machine for fun
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number = 7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450 | |
digits = number.to_s.chars | |
first_thirteen = digits.shift(13).map(&:to_i) | |
initial_result = first_thirteen.reduce(1, :*) | |
digits.reduce({ | |
stack: first_thirteen, acc: initial_result, max: initial_result | |
}) { |state, n| | |
x, y = n.to_i, state[:stack].shift | |
state[:stack] << x | |
if y.zero? | |
state[:acc] = state[:stack].reduce(1, :*) | |
else | |
state[:acc] = state[:acc] / y * x | |
end | |
state[:max] = state[:acc] if state[:acc] > state[:max] | |
state | |
} |
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