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https://github.com/TheAlgorithms/Ruby
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26 lines
720 B
Ruby
26 lines
720 B
Ruby
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# This is a pure ruby implementation of the radix sort algorithm
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# the function returns collection ordered by ascending
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# Example:
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# pry(main)> radix_sort([6, 22, 43, 16, 0, 15, 9])
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# => [0, 6, 9, 15, 16, 22, 43]
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def radix_sort(array, base = 10)
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# passes count equals to the number of digits in the longest number
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passes = (Math.log(array.minmax.map(&:abs).max) / Math.log(base)).floor + 1
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passes.times do |i|
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buckets = Array.new(2 * base) { [] }
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base_i = base**i
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# elements are added to buckets
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# according to the current place-value digit
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array.each do |j|
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n = (j / base_i) % base
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n += base if j >= 0
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buckets[n] << j
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end
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array = buckets.flatten
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end
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array
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end
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