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20.rb
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TILES = DATA.read.split("\n\n").map do |tile_metadata|
tile_id, *tile = tile_metadata.lines.map &:strip
[tile_id[5..].to_i, tile.map(&:chars)]
end.to_h
W = H = 12
def change_orientation tile, mode
case mode
when 0
return tile
when 1
return tile.transpose.map(&:reverse)
when 2
return tile.reverse.map(&:reverse)
when 3
return tile.map(&:reverse).transpose
when 4
return tile.transpose
when 5
return tile.transpose.transpose.map(&:reverse)
when 6
return tile.transpose.reverse.map(&:reverse)
when 7
return tile.transpose.map(&:reverse).transpose
end
end
def edge tile, side
case side
when :top
tile.first.join
when :bottom
tile.last.join
when :left
tile.map(&:first).join
when :right
tile.map(&:last).join
end
end
root_id = TILES.keys.first
root = [root_id, 0, [:top, :right, :bottom, :left].map { |side| edge(TILES[root_id], side) }]
sides = TILES.keys.reject { |id| id == root_id }.flat_map do |id|
(0..7).map do |mode|
o = change_orientation(TILES[id], mode)
[id, mode, [:top, :right, :bottom, :left].map {|side| edge(o, side)}]
end
end
sides << root
queue = [root]
processed = []
graph = Hash.new do |hash, key|
hash[key] = {
top: [],
bottom: [],
left: [],
right: [],
}
end
reversed = {
top: :bottom,
bottom: :top,
left: :right,
right: :left,
}
def side sides, dir
sides[[:top, :right, :bottom, :left].index(dir)]
end
while queue.size > 0
tile_id, tile_mode, tile_sides = queue.shift
for dir in [:top, :bottom, :left, :right]
graph[tile_id][dir] = sides.reject do |id, _, _|
id == tile_id
end.select do |i, m, s|
side(tile_sides, dir) == side(s, reversed[dir])
end
for i, m, s in graph[tile_id][dir]
unless processed.include? i
queue << [i, m, s]
end
processed << i
end
end
processed << tile_id
end
m = graph.select { |k, v| [v[:top], v[:bottom], v[:left], v[:right]].map(&:size).count(0) == 2 }.keys.inject(:*)
puts m # 59187348943703
top_left_id, _ = graph.find do |k,v|
v[:left].empty? && v[:top].empty?
end
mapa_1 = Array.new(H) { |r| Array.new(W) { |c| 0 } }
queue = [
[top_left_id, 0, 0, 0]
]
while queue.size > 0 do
id, mode, r, c = queue.shift
mapa_1[r][c] = change_orientation(TILES[id], mode)
right = graph[id][:right].first
bottom = graph[id][:bottom].first
if bottom
queue << [graph[id][:bottom].first[0], graph[id][:bottom].first[1], r + 1, c]
end
if right
queue << [graph[id][:right].first[0], graph[id][:right].first[1], r, c + 1]
end
end
mapa_2 = Array.new(H * 8) { |r| Array.new(W * 8) { |c| 0 } }
H.times do |rr|
W.times do |cc|
8.times do |r|
8.times do |c|
mapa_2[rr * 8 + r][cc * 8 + c] = mapa_1[rr][cc][r + 1][c + 1]
end
end
end
end
sea_monster = [
" # ",
"# ## ## ###",
" # # # # # # ",
].map &:chars
monster_points = []
sea_monster.size.times do |r|
sea_monster.first.size.times do |c|
if sea_monster[r][c] == ?#
monster_points << [r, c]
end
end
end
for mode in 0..7
transformed_map = change_orientation(mapa_2, mode)
points_to_remove = []
for r in (0..(mapa_2.size - sea_monster.size + 1))
for c in (0..(mapa_2.first.size - sea_monster.first.size + 1))
points = monster_points.map { |rr, cc| [r + rr, c + cc] }
if points.all? { |y,x| transformed_map[y][x] == ?# }
points_to_remove.push *points
end
end
end
points_to_remove.each do |r, c|
transformed_map[r][c] = " "
end
if points_to_remove.size > 0
puts transformed_map.flatten.count ?# # 1565
end
end
__END__
Tile 3371:
##...###.#
........#.
..#.#...#.
##..#.....
##.......#
##........
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.........#
#.#......#
.#..###...
Tile 2663:
.#.##..#..
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.......###
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##.#.##.##
.##..##..#
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Tile 1063:
####...###
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.#..#....#
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#........#
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..........
.#.#....#.
.###....#.
Tile 2731:
.####.#.##
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.#.#.##.#.
##..#..#.#
#.#.#....#
####...#.#
#.....#.##
##.##.....
..#..#..##
......#..#
Tile 2711:
#.##..#..#
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.#.###...#
......#..#
#.....#..#
....#.#...
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....#.#..#
..........
###..####.
Tile 1087:
...#.#####
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#.#..#...#
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..#.#..#.#
.#..##...#
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........#.
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Tile 2767:
###...#.#.
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.#........
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.#.#......
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#.#.###...
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Tile 1951:
#...#...##
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#.##...###
#.##.#..##
...##....#
...#......
##.#######
Tile 2347:
#..##.###.
.........#
#.#......#
.#....#...
..........
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...###.#.#
#...#.....
......##.#
#.......##
Tile 2243:
.#.#...#..
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#.....#..#
........#.
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.#.#.#..#.
Tile 3019:
.##...#.##
......###.
......##.#
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...#......
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Tile 2851:
...#.##..#
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#...#.....
..#..##...
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...#..##..
..#..#..#.
#####.....
Tile 2267:
#####.##..
.....##..#
#.#.......
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...###....
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Tile 2351:
#.#....#..
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##...#.#.#
#.#..#.##.
.#..#.##.#
......#.#.
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Tile 1373:
..###..##.
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.#...#....
..#..#...#
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Tile 2917:
###.#.#.#.
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.#..##.#..
Tile 2423:
#.......##
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.#.#..##.#
..#....###
#........#
.....#....
#.....#.##
..###.#...
Tile 3331:
.....##.##
#........#
#.........
#....#...#
.#.#....#.
#.#...#...
#..#......
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Tile 1297:
.##.##....
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....#.#.#.
.#........
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..#..#..#.
#.......##
#...#.....
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.#.###.#..
Tile 3923:
...###.##.
#...#.....
.#........
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.....#...#
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Tile 1571:
..##..##.#
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##........
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Tile 3461:
.#....#..#
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Tile 1291:
#.#.#...#.
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Tile 2179:
#.###.#...
#....###..
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#.........
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Tile 2153:
#...#....#
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#...#..#..
#....#...#
#.........
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#..#.#..#.
....#.#..#
##..###.##
Tile 2621:
###..#..##
.......#.#
#........#
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##..##...#
#.........
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.....##..#
###.#....#
..##.##.##
Tile 3347:
#.#..#..##
.#.......#
###..###.#
#...#.#..#
#....###..
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#...#.##..
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Tile 3001:
#...###...
#......#.#
#.....####
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#.....##..
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Tile 2707:
.###..#..#
..##...#.#
##.##.#..#
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#......#..
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Tile 3041:
#....##.#.
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.........#
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Tile 1709:
.##.#....#
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#.#.##....
###.....##
#.....#...
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Tile 2837:
.#...#.##.
###..#...#
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Tile 1741:
.####.##..
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#.###.....
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..........
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Tile 2383:
...##.....
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......#...
#####....#
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Tile 1823:
######..##
....#.....
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##........
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##.#.#..##
#...###.##
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Tile 2003:
##..##.###
#.##.#.#.#
.#.#......
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Tile 1367:
..#.###...
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##.####..#
#......###
##......#.
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#..#.##...
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Tile 3733:
..#.###..#
.#....##..
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.........#
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#....#...#
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Tile 3607:
..##..####
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Tile 1559:
####.#..#.
##.#......
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##.##...#.
...#....#.
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Tile 2617:
.#..#.....
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#.#...#...
#......#..
#....#...#
.##.##.##.
...####..#
Tile 1249:
..##.###..
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#.....#..#
.#..#.....
#..#.....#
#........#
......#...
......##..
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Tile 1019:
##.##.###.
##....##..
##........
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#.......#.
#........#
....##....
..#.#..#..
#.........
.#..#.##.#
Tile 1451:
#.#.#..#.#
#.......##
#...#...##
#..#......
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....#....#
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....##....
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Tile 1433:
##..###..#
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#.##.....#
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#.........
.....#...#
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Tile 3803:
.#..##....
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#.........
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Tile 3181:
###.#...#.
#.#......#
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###....#..
.###.#.##.
Tile 1831:
#..#..#.##
##...#.#.#
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#..#....#.
##..#...#.
..#.......
#.##.....#
##.#....#.
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##.###.##.
Tile 2843:
.###...#.#
......##.#
#.#......#
##.#...#.#
.##.#.....
.#......#.
#.#.#....#
##........
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###.##..#.
Tile 3691:
..#####...
.........#
#....#...#
.#...#..##
..........
##....#.#.
#........#
#.#.#.....
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Tile 1327:
.#...#...#
#.....#.##
#..#.#..#.
##.......#
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