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reduce -> map_reduce

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Adam Millerchip 2020-12-17 12:07:00 +09:00
parent cd95b1713c
commit ab7c6d5d33
1 changed files with 2 additions and 2 deletions
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4
day16/day16part2.exs
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@ -44,9 +44,9 @@ defmodule Day16Part2 do
def reduce_to_column_by_field_name(valid_fields_by_column) do def reduce_to_column_by_field_name(valid_fields_by_column) do
valid_fields_by_column valid_fields_by_column
|> Enum.sort_by(fn {_k, v} -> length(v) end) |> Enum.sort_by(fn {_k, v} -> length(v) end)
|> Enum.reduce({[], []}, fn {col, fields}, {identified, seen} -> |> Enum.map_reduce([], fn {col, fields}, seen ->
[field] = fields -- seen [field] = fields -- seen
{[{field, col} | identified], [field | seen]} {{field, col}, [field | seen]}
end) end)
|> elem(0) |> elem(0)
end end