diff options
| author | Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com> | 2020-12-25 15:48:06 +0100 |
|---|---|---|
| committer | Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com> | 2020-12-25 15:48:06 +0100 |
| commit | ca0df3d74d675743b92d62207b0fe107af767d30 (patch) | |
| tree | ca6ade7312f09dd24574593794c448cc73b54f83 /20 | |
| parent | e2e8223c6bd35483a17fd803fc1622a1f09ef80c (diff) | |
Add day 20
Diffstat (limited to '20')
| -rw-r--r-- | 20/a.lua | 95 | ||||
| -rw-r--r-- | 20/b-combine.lua | 233 | ||||
| -rw-r--r-- | 20/b-find.lua | 108 | ||||
| -rw-r--r-- | 20/b.sh | 2 | ||||
| -rw-r--r-- | 20/input.txt | 1728 |
5 files changed, 2166 insertions, 0 deletions
diff --git a/20/a.lua b/20/a.lua new file mode 100644 index 0000000..ee469d1 --- /dev/null +++ b/20/a.lua @@ -0,0 +1,95 @@ +tiles = {} + +current_tile_number = nil +current_tile = {} + +function border(tile, horizontal, index) + first_column = 0 + first_row = 0 + last_column = 0 + last_row = 0 + if horizontal then + first_column = 1 + last_column = #tile[1] + first_row = index + last_row = index + else + first_column = index + last_column = index + first_row = 1 + last_row = #tile + end + + b = '' + for row = first_row, last_row do + for column = first_column, last_column do + b = b .. tile[row][column] + end + end + + if (horizontal and index > 1) or (not horizontal and index == 1) then + b = b:reverse() + end + + return b +end + +function borders(tile) + return { + border(tile, true, 1), + border(tile, true, 10), + border(tile, false, 1), + border(tile, false, 10) + } +end + +for line in io.lines('input.txt') do + if line == "" and current_tile_number then + tiles[current_tile_number] = current_tile + current_tile = {} + end + + space_index = line:find(' ') + + if space_index then + current_tile_number = line:sub(space_index+1, -2) + elseif #line > 0 then + row = {} + for i = 1, line:len() do + table.insert(row, line:sub(i, i)) + end + table.insert(current_tile, row) + end +end + +border_counts = {} +for _, tile in pairs(tiles) do + for _, border in pairs(borders(tile)) do + if not border_counts[border] then + border_counts[border] = 0 + end + border_counts[border] = border_counts[border] + 1 + end +end + +corners = {} +for number,tile in pairs(tiles) do + count_neighboorless = 0 + for _, border in pairs(borders(tile)) do + has_flipped_neighbor = border_counts[border] > 1 + has_non_flipped_neighbor = border_counts[border:reverse()] + if not (has_flipped_neighbor or has_non_flipped_neighbor) then + count_neighboorless = count_neighboorless + 1 + end + end + if count_neighboorless == 2 then + table.insert(corners, number) + end +end + +product = 1 +for i,c in pairs(corners) do + product = product * c +end + +print(product) diff --git a/20/b-combine.lua b/20/b-combine.lua new file mode 100644 index 0000000..f5d176c --- /dev/null +++ b/20/b-combine.lua @@ -0,0 +1,233 @@ +Tile = {} +Tile.__index = Tile + +Tile.__tostring = function(self) + string = '' + for i = 1, 10 do + for j = 1, 10 do + string = string .. self:get(i, j) .. ' ' + end + string = string .. "\n" + end + + return string +end + +function id(x, y) + return x, y +end + +function Tile:new(tile) + local object = {} + object.tile = tile + object.transform = id + return setmetatable(object, self) +end + +function Tile:rotate() + local old_transform = self.transform + self.transform = function(x, y) + return old_transform(y, 10 - x + 1) + end +end + +function Tile:flip() + local old_transform = self.transform + self.transform = function(x, y) + return old_transform(x, 10 - y + 1) + end +end + +function Tile:get(x, y) + x, y = self.transform(x, y) + return self.tile[x][y] +end + +function Tile:border(horizontal, index) + first_column = 0 + first_row = 0 + last_column = 0 + last_row = 0 + if horizontal then + first_column = 1 + last_column = 10 + first_row = index + last_row = index + else + first_column = index + last_column = index + first_row = 1 + last_row = 10 + end + + b = '' + for row = first_row, last_row do + for column = first_column, last_column do + b = b .. self:get(row, column) + end + end + + if (horizontal and index > 1) or (not horizontal and index == 1) then + b = b:reverse() + end + + return b +end + +function Tile:borders() + return { + self:border(true, 1), + self:border(true, 10), + self:border(false, 1), + self:border(false, 10) + } +end + +Board = {} +Board.__index = Board + +function Board:new(corner) + object = {} + object.board = {} + object.board[1] = {} + object.board[1][1] = corner + return setmetatable(object, self) +end + +function Board:try_add(x, y, tile) + if not self.board[x] then self.board[x] = {} end + local reference_tile = self.board[x][y - 1] + below = false + if not reference_tile then + below = true + reference_tile = self.board[x - 1][y] + end + + assert(reference_tile, "tried to insert tile at non-connected location") + + orientation_matches = function() return false end + if below then + orientation_matches = function() + return reference_tile:border(true, 10) == tile:border(true, 1):reverse() + end + else + orientation_matches = function() + return reference_tile:border(false, 10) == tile:border(false, 1):reverse() + end + end + + correctly_rotated = false + for i = 1, 4 do + if orientation_matches() then + correctly_rotated = true + break + end + tile:rotate() + end + + if not correctly_rotated then + tile:flip() + for i = 1, 4 do + if orientation_matches() then + correctly_rotated = true + break + end + tile:rotate() + end + end + + if correctly_rotated then + if not self.board[x] then + self.board[x] = {} + end + self.board[x][y] = tile + end + + return correctly_rotated +end + +tiles = {} +current_tile_number = nil +current_tile = {} + +for line in io.lines('input.txt') do + if line == "" and current_tile_number then + tiles[current_tile_number] = Tile:new(current_tile) + current_tile = {} + end + + space_index = line:find(' ') + + if space_index then + current_tile_number = line:sub(space_index+1, -2) + elseif #line > 0 then + row = {} + for i = 1, line:len() do + table.insert(row, line:sub(i, i)) + end + table.insert(current_tile, row) + end +end + +corner = '1327' +corner_tile = tiles[corner] +corner_tile:flip() + +board = Board:new(tiles[corner]) + +handled = {} +handled[corner] = true + +visited = {} +visited[1] = {} +visited[1][1] = true +visited[2] = {} +visited[2][1] = true +visited[1][2] = true + +queue = {} +table.insert(queue, {1, 2}) +table.insert(queue, {2, 1}) +while #queue ~= 0 do + current = table.remove(queue, 1) + x = current[1] + y = current[2] + inserted = false + for tile_id, tile in pairs(tiles) do + if not handled[tile_id] then + if board:try_add(x, y, tile) then + assert(board.board[x][y]) + inserted = true + handled[tile_id] = true + + if not visited[x] then visited[x] = {} end + if not visited[x + 1] then visited[x + 1] = {} end + if x < 12 and not visited[x + 1][y] then + table.insert(queue, {x + 1, y}) + visited[x + 1][y] = true + end + if y < 12 and not visited[x][y + 1] then + table.insert(queue, {x, y + 1}) + visited[x][y + 1] = true + end + break + end + end + end + if not inserted then + print('failed') + break + end +end + +for i = 1, 12 do + for x = 2, 9 do + for j = 1, 12 do + local tile = board.board[i][j] + for y = 2, 9 do + io.write(tile:get(x, y)) + end + end + print() + end +end diff --git a/20/b-find.lua b/20/b-find.lua new file mode 100644 index 0000000..800fc6e --- /dev/null +++ b/20/b-find.lua @@ -0,0 +1,108 @@ +function parse_row(line) + row = {} + for i = 1, #line do + table.insert(row, line:sub(i, i)) + end + return row +end +Map = {} +Map.__index = Map + +Map.__tostring = function(self) + string = '' + for i = 1, 96 do + for j = 1, 96 do + string = string .. self:get(i, j) .. ' ' + end + string = string .. "\n" + end + + return string +end + +function Map:get(x, y) + x, y = self.transform(x, y) + return self.map[x][y] +end + +function id(x, y) + return x, y +end + +function Map:new(map) + local object = {} + object.map = map + object.transform = id + return setmetatable(object, self) +end + +function Map:rotate() + local old_transform = self.transform + self.transform = function(x, y) + return old_transform(y, 96 - x + 1) + end +end + +function Map:flip() + local old_transform = self.transform + self.transform = function(x, y) + return old_transform(x, 96 - y + 1) + end +end + +function Map:has_monster(x, y) + if x + #monster > 96 then + print('x too large') + return false + end + if y + #monster[1] > 96 then + print('y too large') + return false + end + for i = 1, #monster do + for j = 1, #monster[1] do + if monster[i][j] == '#' and self:get(x+i, y+j) ~= '#' then + return false + end + end + end + + return true +end + +monster = {} +monster[1] = parse_row(' # ') +monster[2] = parse_row('# ## ## ###') +monster[3] = parse_row(' # # # # # # ') + +map = {} +for line in io.lines('combined') do + table.insert(map, parse_row(line)) +end + +map = Map:new(map) +map:flip() +map:rotate() +map:rotate() +map:rotate() + +count = 0 +for x = 1, 96 - #monster do + for y = 1, 96 - #monster[1] do + if map:has_monster(x, y) then + count = count + 1 + end + end +end + +hashes = 0 +for i = 1, 96 do + for j = 1, 96 do + if map.map[i][j] == '#' then + hashes = hashes + 1 + end + end +end + +result = hashes - count * 15 +print(result) @@ -0,0 +1,2 @@ +lua b-combine.lua > combined +lua b-find.lua diff --git a/20/input.txt b/20/input.txt new file mode 100644 index 0000000..e2f04ac --- /dev/null +++ b/20/input.txt @@ -0,0 +1,1728 @@ +Tile 1487: +.##..#...# +##.##..... +...#....## +##..#..#.# +.####....# +.#.#..#..# +..##.....# +..##....## +#.....#..# +...#..#### + +Tile 3637: +##...#.... +#.#..#...# +....##...# +#......... +#......#.# +##...#.#.. +#......... +##.....### +##.#...... +##.#.##..# + +Tile 3433: +.....#..#. +##..##...# +....#..... +.........# +#........# +#..##..### +#..#..##.. +#...##.#.. +.#...#..#. +#.##....#. + +Tile 3931: +#....##..# +...#..###. +#...#..#.# +.......#.. +#.......#. +###......# +###.#.#..# +.##..#..#. +...##..#.# +..##..#.#. + +Tile 2213: +.###...##. +..##...... +.......... +.##...#... +...##...#. +..#.#..#.# +..##...... +#..#.#.### +...#...... +#.#..##... + +Tile 1901: +.#.##.#.#. +#......... +#.##..#.## +...###...# +.....#.#.# +.#.....#.. +....#.#... +..#...#..# +#........# +####.###.. + +Tile 3917: +.##.#..#.# +#.##....#. +#.....#... +#.#...#.## +.......... +.......... +.#....#.#. +.........# +.....#.... +#.#.##.... + +Tile 1831: +.#..#..##. +#.....##.. +###....### +.#.#.##..# +#....#...# +......#.#. +.....#..## +#..##..... +####.#.##. +...##.#..# + +Tile 3557: +..#.#.#.#. +##........ +.......#.. +.##....... +.......... +....#..#.. +#...#....# +#..#####.# +#..#...##. +#.....###. + +Tile 2659: +####.##.#. +.##.##...# +####..#... +##........ +####...... +.......#.# +###....#.. +.....#..## +#....#...# +.#..###.#. + +Tile 3061: +.#..#.#..# +........#. +##.#....#. +###....#.. +.........# +..#..#.... +....#..#.# +.#.##...## +##.#....## +.#.#.##.## + +Tile 3593: +###.#.#### +.#........ +#..#....#. +.......### +.#....##.# +....#..##. +#.#.....## +#..#...#.. +.#......#. +#....##..# + +Tile 2719: +..###.#..# +..##...##. +..##.....# +#.......#. +...#....## +#.#....#.. +#.......#. +#..#.....# +........## +.#.#..##.# + +Tile 3089: +##.#.#.#.# +.#..#....# +.#.#.....# +##...#.#.# +.......#.. +###..####. +....#..... +........#. +.#.....##. +..####..#. + +Tile 1723: +..#.##.### +#..###.#.# +..#..#...# +....#.#... +....#....# +#....#.... +#.....#... +#.#..#.#.. +#...###..# +###.####.. + +Tile 2297: +.##....#.# +####..#.## +#.##...##. +#.##...#.# +###.##..## +....#...## +##....##.# +..##...##. +##.#.#..#. +#...#.##.. + +Tile 3659: +.#####.... +....#.#.## +.#..#....# +....#....# +.....#...# +.....#..## +##..#..... +##...#.... +####....## +##......#. + +Tile 1847: +###.#.#### +..##.....# +#.......#. +##......#. +..#.#..... +#.......#. +.#..#...#. +.#......#. +#.....###. +##.###.##. + +Tile 1601: +#.#.##.### +.#..#...#. +##...#..#. +#.#####..# +.......#.# +##..##.##. +..#.#..#.. +..###....# +.....#...# +....#####. + +Tile 3323: +..#..##.## +##......## +###.#...#. +.#..#..#.. +#...#..### +#....##... +##.....#.# +...####... +....#..... +..##....## + +Tile 1321: +###.###### +#...#.#..# +##........ +#..#..#.#. +..##.#..#. +.........# +.#.......# +#..#...... +##.#.....# +.###...#.# + +Tile 2551: +....##...# +...#.##... +.##....... +...#..#... +#.#...##.# +#..##.#... +.##..#.##. +##....#..# +...#.....# +..#.#.#.#. + +Tile 2503: +...#..##.# +.........# +#.#....##. +#......... +##..#.#... +#...#..#.. +...#...... +.##.##.... +#......... +###.....## + +Tile 1163: +#.####..#. +.##.#.#... +#.#..##### +......#... +##....#..# +#.......## +#.#.##..#. +##...###.# +#......... +.##.#...## + +Tile 1039: +#.###.#.#. +.##......# +.#...#..#. +.#...#...# +#.#...#..# +##.#...#.. +#.##...... +#.#.#..#.. +##...#..## +#.####..## + +Tile 2953: +...#.#.#.# +..#.#..... +.........# +#..#...#.# +......#... +.........# +....#..#.. +.###....#. +##.##..### +..####.#.. + +Tile 1609: +...#...#.. +#....##..# +...###.#.. +#.##.##..# +#.#.##.#.. +##.......# +.##...#..# +#....#.... +........#. +.....#..#. + +Tile 1187: +####.##... +.......... +.....#...# +#.#......# +#....#.### +.#..###.#. +##...#.... +......#..# +....#.#..# +#####...## + +Tile 3313: +#######..# +#.#...#### +.......... +#.#..##... +###......# +##........ +##......## +##..#.#... +..#..#..#. +#..#...##. + +Tile 3221: +....#.#.#. +##..#..... +.#.##..#.. +#..##..#.# +....#....# +##.......# +#.......#. +#.###...## +#..#...... +#....##... + +Tile 2647: +.##.#.#### +..#....... +#...##.... +#..#....## +......#... +..##...... +.#.....#.# +###.##.... +###...###. +##.#.#..#. + +Tile 2879: +#.#.#..### +......#### +##....#.#. +.#.......# +....##..#. +#..#.###.# +#......... 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