diff options
Diffstat (limited to '24')
| -rw-r--r-- | 24/a.lua | 72 | ||||
| -rw-r--r-- | 24/b.lua | 121 | ||||
| -rw-r--r-- | 24/input.txt | 535 |
3 files changed, 728 insertions, 0 deletions
diff --git a/24/a.lua b/24/a.lua new file mode 100644 index 0000000..dbf6868 --- /dev/null +++ b/24/a.lua @@ -0,0 +1,72 @@ +tiles = {} + +directions = {'se', 'sw', 'ne', 'nw', 'e', 'w'} + +function navigate(v, h, direction) + if direction == 'e' then + return v, h+1 + elseif direction == 'w' then + return v, h-1 + end + + local even = v % 2 == 0 + local new_v = v + local new_h = h + + if direction:sub(1, 1) == 'n' then + new_v = new_v - 1 + else + new_v = new_v + 1 + end + + + if even and direction:sub(2, 2) == 'e' then + new_h = new_h + 1 + elseif not even and direction:sub(2, 2) == 'w' then + new_h = new_h - 1 + end + + return new_v, new_h +end + +function parse_tile(line) + local vertical = '' + local tile = {} + for i = 1, #line do + local current = line:sub(i, i) + if current == 'n' or current == 's' then + vertical = current + else + table.insert(tile, vertical .. current) + vertical = '' + end + end + + return tile +end + +for line in io.lines('input.txt') do + local tile = parse_tile(line) + local v = 0 + local h = 0 + + for _, direction in pairs(tile) do + v, h = navigate(v, h, direction) + end + + if not tiles[v] then tiles[v] = {} end + if not tiles[v][h] then tiles[v][h] = 0 end + + tiles[v][h] = tiles[v][h] + 1 +end + +count = 0 +for _, row in pairs(tiles) do + for _, flips in pairs(row) do + if flips % 2 == 1 then + count = count + 1 + end + end +end + +print(count) diff --git a/24/b.lua b/24/b.lua new file mode 100644 index 0000000..16b15b8 --- /dev/null +++ b/24/b.lua @@ -0,0 +1,121 @@ +tiles = {} + +directions = {'se', 'sw', 'ne', 'nw', 'e', 'w'} + +function navigate(v, h, direction) + if direction == 'e' then + return v, h+1 + elseif direction == 'w' then + return v, h-1 + end + + local even = v % 2 == 0 + local new_v = v + local new_h = h + + if direction:sub(1, 1) == 'n' then + new_v = new_v - 1 + else + new_v = new_v + 1 + end + + + if even and direction:sub(2, 2) == 'e' then + new_h = new_h + 1 + elseif not even and direction:sub(2, 2) == 'w' then + new_h = new_h - 1 + end + + return new_v, new_h +end + +function parse_tile(line) + local vertical = '' + local tile = {} + for i = 1, #line do + local current = line:sub(i, i) + if current == 'n' or current == 's' then + vertical = current + else + table.insert(tile, vertical .. current) + vertical = '' + end + end + + return tile +end + +max_v = 0 +max_h = 0 + +for line in io.lines('input.txt') do + local tile = parse_tile(line) + local v = 0 + local h = 0 + + for _, direction in pairs(tile) do + v, h = navigate(v, h, direction) + end + + if math.abs(v) > max_v then max_v = math.abs(v) end + if math.abs(h) > max_h then max_h = math.abs(h) end + + if not tiles[v] then tiles[v] = {} end + if not tiles[v][h] then tiles[v][h] = 0 end + + tiles[v][h] = (tiles[v][h] + 1) % 2 +end + +function black(tiles, v, h) + if not tiles[v] then return false end + return tiles[v][h] == 1 +end + +for i = 1, 100 do + max_v = max_v + 1 + max_h = max_h + 1 + + local count = 0 + local new_tiles = {} + for v = -max_v, max_v do + for h = -max_h, max_h do + if not new_tiles[v] then new_tiles[v] = {} end + local count_black = 0 + for _, direction in pairs(directions) do + local v1, h1 = navigate(v, h, direction) + if black(tiles, v1, h1) then + count_black = count_black + 1 + end + end + + if black(tiles, v, h) then + if count_black == 0 or count_black > 2 then + new_tiles[v][h] = 0 + else + count = count + 1 + new_tiles[v][h] = 1 + end + else + if count_black == 2 then + count = count + 1 + new_tiles[v][h] = 1 + else + new_tiles[v][h] = 0 + end + end + end + end + + tiles = new_tiles +end + +count = 0 +for _, row in pairs(tiles) do + for _, flips in pairs(row) do + if flips % 2 == 1 then + count = count + 1 + end + end +end + +print(count) diff --git a/24/input.txt b/24/input.txt new file mode 100644 index 0000000..a65f7ae --- /dev/null +++ b/24/input.txt @@ -0,0 +1,535 @@ +swsenenwneswnewseswwseswnwsweeswnw +esweeeeneeeneeeweeeenenenee +ewewsewswnewnwnewwwwsew 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