14 lines
365 B
Ruby
14 lines
365 B
Ruby
# frozen_string_literal: true
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inputs = []
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File.foreach('./2023/day9/data') do |line|
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inputs << line.split(' ').map(&:to_i)
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end
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def add_derivative(inputs)
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return 0 if inputs.all?(&:zero?)
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inputs[-1] + add_derivative(inputs.map.with_index { |x, i| i.zero? ? x : x - inputs[i - 1] }[1..inputs.length])
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end
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puts inputs.map { |input| add_derivative input }.sum
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