1 files changed, 61 insertions, 0 deletions

diff --git a/src/24/part1 b/src/24/part1
new file mode 100644
index 0000000..8ad7455
--- /dev/null
+++ b/src/24/part1
@@ -0,0 +1,61 @@
+--- Day 24: Lobby Layout ---
+
+Your raft makes it to the tropical island; it turns out that the small crab was an excellent
+navigator. You make your way to the resort.
+
+As you enter the lobby, you discover a small problem: the floor is being renovated. You can't even
+reach the check-in desk until they've finished installing the new tile floor.
+
+The tiles are all hexagonal; they need to be arranged in a hex grid with a very
+specific color pattern. Not in the mood to wait, you offer to help figure out the pattern.
+
+The tiles are all white on one side and black on the other. They start
+with the white side facing up. The lobby is large enough to fit whatever pattern might need to
+appear there.
+
+A member of the renovation crew gives you a list of the tiles that need to be flipped
+over (your puzzle input). Each line in the list identifies a single tile that needs to be
+flipped by giving a series of steps starting from a reference tile in the very center
+of the room. (Every line starts from the same reference tile.)
+
+Because the tiles are hexagonal, every tile has six neighbors: east, southeast,
+southwest, west, northwest, and northeast. These directions are given in your list, respectively, as
+e, se, sw, w, nw, and ne. A tile is identified by a series of these directions with no
+delimiters; for example, esenee identifies the tile you land on if you start at the reference
+tile and then move one tile east, one tile southeast, one tile northeast, and one tile east.
+
+Each time a tile is identified, it flips from white to black or from black to white. Tiles might be
+flipped more than once. For example, a line like esew flips a tile immediately adjacent to the
+reference tile, and a line like nwwswee flips the reference tile itself.
+
+Here is a larger example:
+
+sesenwnenenewseeswwswswwnenewsewsw
+neeenesenwnwwswnenewnwwsewnenwseswesw
+seswneswswsenwwnwse
+nwnwneseeswswnenewneswwnewseswneseene
+swweswneswnenwsewnwneneseenw
+eesenwseswswnenwswnwnwsewwnwsene
+sewnenenenesenwsewnenwwwse
+wenwwweseeeweswwwnwwe
+wsweesenenewnwwnwsenewsenwwsesesenwne
+neeswseenwwswnwswswnw
+nenwswwsewswnenenewsenwsenwnesesenew
+enewnwewneswsewnwswenweswnenwsenwsw
+sweneswneswneneenwnewenewwneswswnese
+swwesenesewenwneswnwwneseswwne
+enesenwswwswneneswsenwnewswseenwsese
+wnwnesenesenenwwnenwsewesewsesesew
+nenewswnwewswnenesenwnesewesw
+eneswnwswnwsenenwnwnwwseeswneewsenese
+neswnwewnwnwseenwseesewsenwsweewe
+wseweeenwnesenwwwswnew
+
+In the above example, 10 tiles are flipped once (to black), and 5 more are flipped twice (to black,
+then back to white). After all of these instructions have been followed, a total of 10
+tiles are black.
+
+Go through the renovation crew's list and determine which tiles they need to flip. After all of the
+instructions have been followed, how many tiles are left with the black side up?
+
+