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gfe
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| defp gfe([]), do: nil | |
| defp gfe(queue) do | |
| {_, front_elem} = queue | |
| |> Enum.group_by(fn {_, prio} -> prio end) | |
| |> Map.to_list | |
| |> List.last | |
| {List.last(front_elem), queue -- [List.last(front_elem)]} | |
| end |
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