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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Sorting-Algorithms-Circle-Sort/Elixir/sorting-algorithms-circle-sort.elixir Normal file
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defmodule Sort do
def circle_sort(data) do
List.to_tuple(data)
|> circle_sort(0, length(data)-1)
|> Tuple.to_list
end
defp circle_sort(data, lo, hi) do
case circle_sort(data, lo, hi, 0) do
{result, 0} -> result
{result, _} -> circle_sort(result, lo, hi)
end
end
defp circle_sort(data, lo, lo, swaps), do: {data, swaps}
defp circle_sort(data, lo, hi, swaps) do
mid = div(lo + hi, 2)
{data, swaps} = do_circle_sort(data, lo, hi, swaps)
{data, swaps} = circle_sort(data, lo, mid, swaps)
circle_sort(data, mid+1, hi, swaps)
end
def do_circle_sort(data, lo, hi, swaps) when lo>=hi do
if lo==hi and elem(data, lo) > elem(data, hi+1),
do: {swap(data, lo, hi+1), swaps+1},
else: {data, swaps}
end
def do_circle_sort(data, lo, hi, swaps) do
if elem(data, lo) > elem(data, hi),
do: do_circle_sort(swap(data, lo, hi), lo+1, hi-1, swaps+1),
else: do_circle_sort(data, lo+1, hi-1, swaps)
end
defp swap(data, i, j) do
vi = elem(data, i)
vj = elem(data, j)
data |> put_elem(i, vj) |> put_elem(j, vi)
end
end
data = [6, 7, 8, 9, 2, 5, 3, 4, 1]
IO.puts "before sort: #{inspect data}"
IO.puts " after sort: #{inspect Sort.circle_sort(data)}"