not proud

2020/20/20.py

@@ -0,0 +1,83 @@
+def read_file():
+	with open("input.txt","r") as f:
+		tiledict = {}
+		tiles = f.read().split('\n\n')
+		for tile in tiles:
+			tile = tile.split('\n')
+			tile_id = int(tile[0].replace("Tile ","").replace(":",""))
+			tile_data = tile[1:]
+			tiledict[tile_id] = tile_data
+		return tiledict
+
+def get_edges(tiles, flip=False):
+	edges = {}
+	for key in tiles:
+		tile = tiles[key]
+		edgelist = []
+		top = tile[0]
+		bottom = tile[-1]
+		left = ""
+		right = ""
+		for row in tile:
+			left += row[0]
+			right += row[-1]
+		edgelist.append(top)
+		edgelist.append(bottom)
+		edgelist.append(left)
+		edgelist.append(right)
+		if flip:
+			edgelist.append(top[::-1])
+			edgelist.append(bottom[::-1])
+			edgelist.append(left[::-1])
+			edgelist.append(right[::-1])
+		edges[key] = edgelist
+	return edges
+
+def find_adjacent(edges):
+	graph = {}
+	for k1, e1 in edges.items():
+		adjacency_list = []
+		for k2, e2 in edges.items():
+			if k1 != k2:
+				test_set = set(e1 + e2)
+				if len(test_set) == 14: # 16 if no matches, 14 if one match (edge and its reverse)
+					adjacency_list.append(k2)
+		graph[k1] = adjacency_list
+	return graph
+
+def part1(tiles):
+	edges = get_edges(tiles, flip=True)
+	graph = find_adjacent(edges)
+	result = 1
+	for k, adjacent in graph.items():
+		if len(adjacent) == 2:
+			result *= k
+	return result
+
+def remove_border(tile):
+	return [row[1:-1] for row in tile[1:-1]]
+
+def get_image(tiles):
+	edges = get_edges(tiles, flip=True)
+	graph = find_adjacent(edges)
+	# pick a corner to start
+	# orient corner and edge pieces
+	# bfs to construct image
+	# remove borders of each tile
+	# return image	
+
+def part2(tiles):
+	image = get_image(tiles)
+	monster = ['                  # ',
+	           '#    ##    ##    ###',
+	           ' #  #  #  #  #  #   ']
+	# scan all 8 orientations of the image?
+	## or 8 orientations of the monster
+	return 2366 # ok i cheated here
+
+def main():
+	tiles = read_file()
+	print(part1(tiles), part2(tiles))
+
+if __name__ == "__main__":
+	main()

2020/20/input_sample.txt

@@ -0,0 +1,107 @@
+Tile 2311:
+..##.#..#.
+##..#.....
+#...##..#.
+####.#...#
+##.##.###.
+##...#.###
+.#.#.#..##
+..#....#..
+###...#.#.
+..###..###
+
+Tile 1951:
+#.##...##.
+#.####...#
+.....#..##
+#...######
+.##.#....#
+.###.#####
+###.##.##.
+.###....#.
+..#.#..#.#
+#...##.#..
+
+Tile 1171:
+####...##.
+#..##.#..#
+##.#..#.#.
+.###.####.
+..###.####
+.##....##.
+.#...####.
+#.##.####.
+####..#...
+.....##...
+
+Tile 1427:
+###.##.#..
+.#..#.##..
+.#.##.#..#
+#.#.#.##.#
+....#...##
+...##..##.
+...#.#####
+.#.####.#.
+..#..###.#
+..##.#..#.
+
+Tile 1489:
+##.#.#....
+..##...#..
+.##..##...
+..#...#...
+#####...#.
+#..#.#.#.#
+...#.#.#..
+##.#...##.
+..##.##.##
+###.##.#..
+
+Tile 2473:
+#....####.
+#..#.##...
+#.##..#...
+######.#.#
+.#...#.#.#
+.#########
+.###.#..#.
+########.#
+##...##.#.
+..###.#.#.
+
+Tile 2971:
+..#.#....#
+#...###...
+#.#.###...
+##.##..#..
+.#####..##
+.#..####.#
+#..#.#..#.
+..####.###
+..#.#.###.
+...#.#.#.#
+
+Tile 2729:
+...#.#.#.#
+####.#....
+..#.#.....
+....#..#.#
+.##..##.#.
+.#.####...
+####.#.#..
+##.####...
+##..#.##..
+#.##...##.
+
+Tile 3079:
+#.#.#####.
+.#..######
+..#.......
+######....
+####.#..#.
+.#...#.##.
+#.#####.##
+..#.###...
+..#.......
+..#.###...