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tiny simplification

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Adam Millerchip 2024-12-10 23:34:24 +09:00
parent b9ca148096
commit df718ad579
1 changed files with 2 additions and 4 deletions
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2024/day10.exs
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@ -9,16 +9,14 @@ defmodule Day10 do
def find_trails(point, _grid, 9), do: [point] def find_trails(point, _grid, 9), do: [point]
def find_trails({x, y}, grid, height) do def find_trails({x, y}, grid, height) do
find_neighbours(x, y, height, grid) find_neighbours(x, y, height + 1, grid)
|> Enum.flat_map(fn {point, _} -> find_trails(point, grid, height + 1) end) |> Enum.flat_map(fn {point, _} -> find_trails(point, grid, height + 1) end)
end end
def find_neighbours(x, y, height, grid) do def find_neighbours(x, y, height, grid) do
next_height = height + 1
grid grid
|> Map.take([{x - 1, y}, {x + 1, y}, {x, y - 1}, {x, y + 1}]) |> Map.take([{x - 1, y}, {x + 1, y}, {x, y - 1}, {x, y + 1}])
|> Enum.filter(&match?({_, ^next_height}, &1)) |> Enum.filter(&match?({_, ^height}, &1))
end end
def part2({grid, zeros}) do def part2({grid, zeros}) do