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remove the implementation

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Ruidy 2024-12-04 13:36:42 +01:00
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lib/advent_code2024/solutions/day04/day4.ex
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@ -86,77 +86,5 @@ defmodule AdventCode2024.Solutions.Day04 do
end
def count_x_mas(grid) do
directions = [
# Down
{1, 0},
# Right
{0, 1},
# Down-right diagonal
{1, 1},
# Down-left diagonal
{1, -1}
]
grid_chars = Enum.map(grid, &String.graphemes/1)
grid_chars
|> Enum.with_index()
|> Enum.reduce(0, fn {row, row_idx}, acc ->
row
|> Enum.with_index()
|> Enum.reduce(acc, fn {_, col_idx}, acc_inner ->
acc_inner + count_xmas_from(grid_chars, {row_idx, col_idx}, directions)
end)
end)
end
defp count_xmas_from(grid, {row, col}, directions) do
directions
|> Enum.reduce(0, fn direction, acc ->
if find_xmas?(grid, {row, col}, direction) do
acc + 1
else
acc
end
end)
end
defp find_xmas?(grid, {row, col}, {d_row, d_col}) do
# Define the positions for the X pattern
positions_right = [
# M
{row, col},
# A
{row + d_row, col + d_col},
# S
{row + 2 * d_row, col + 2 * d_col}
]
positions_left = [
# M
{row, col + 2 * d_col},
# A (center shared)
{row + d_row, col + d_col},
# S
{row + 2 * d_row, col}
]
# Check both diagonals for "MAS" (can be forwards or backwards)
(check_mas?(grid, positions_right) or check_sam?(grid, positions_right)) and
(check_mas?(grid, positions_left) or check_sam?(grid, positions_left))
end
defp check_mas?(grid, [{r1, c1}, {r2, c2}, {r3, c3}]) do
within_bounds?(grid, r1, c1) and within_bounds?(grid, r2, c2) and within_bounds?(grid, r3, c3) and
Enum.at(Enum.at(grid, r1), c1) == "M" and
Enum.at(Enum.at(grid, r2), c2) == "A" and
Enum.at(Enum.at(grid, r3), c3) == "S"
end
defp check_sam?(grid, [{r1, c1}, {r2, c2}, {r3, c3}]) do
within_bounds?(grid, r1, c1) and within_bounds?(grid, r2, c2) and within_bounds?(grid, r3, c3) and
Enum.at(Enum.at(grid, r1), c1) == "S" and
Enum.at(Enum.at(grid, r2), c2) == "A" and
Enum.at(Enum.at(grid, r3), c3) == "M"
end
end