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24.input

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+nwswswwswswseseneswswwnewsweswswswsw
+wswwwwwewwwe
+nenenenesewnenenenenwnenenenwwswnwsene
+eeseseenweeeesweeeeewee
+wswnwneswnwwsewwswswswwweswseswswew
+wsesesewenwswseswseweeswswesesw
+senwswseswswseswswnwswnwnesweweenesewse
+weneneneeneneswneeeenenwneswswnee
+nwnwnwnenwnwenwnenenwwnwsewsewenenwnw
+nenenenenewneneneneneneneneneene
+eswseswwwwwwwnwswsewweswnewe
+wseweenweeneewseeseswesese
+wnewenwsweeneenesenesweneeneee
+nwnwwnwnwwwnwnwsenwwnewwenwsenww
+swneseswswswsenwwenwswwwswswneswwwnew
+esenwenwswwswenwswsewnwswswswenw
+swnwewneeswswswswswswswnwseseseseesesw
+nenewnwnenesenenenesweneneeneneneneenene
+neswsewnewswswswwseswswneswwswseswswsw
+nwswwnwnwenwnwnwnwnwnwnwnwwnwwnwnw
+seseneswnwneswsesenwswnewnwnwsenwewnenene
+neneeesesenwneneeeneneeswneeenww
+eeesweeswseeseweeeneseeeeenw
+seseseeeswwswwneswswwnwnwseeswese
+swnwnwenwnenenwnwneenenwnenwnwnenenwswsene
+wwsenewnwwnwwwwwwwsenwswnwwww
+enenewnwswseeneseewneseseswesesee
+nwwwswsewwnwwnwwwwswswswseswswe
+wseswwseswnwseeseseeseseseseeswne
+enwsesweeeeeneeeeeeeeeenw
+seseeseseseeseswsesenwweeseenesenwsesw
+senwneseseseswseswseswseswnwsesesewsesesese

24.py

@@ -0,0 +1,69 @@
+input = []
+
+with open("24.input") as f:
+    for line in f.readlines():
+        seq = []
+        i = iter(list(line.strip()))
+        c1 = next(i, None)
+        while c1 != None:
+            if c1 in ['s', 'n']:
+                seq.append(c1 + next(i))
+            else:
+                seq.append(c1)
+            c1 = next(i, None)
+        input.append(seq)
+
+def get_pos(seq):
+    pos = [0, 0]
+    for move in seq:
+        if move == 'w':
+            pos[0] -= 2
+        elif move == 'e':
+            pos[0] += 2
+        else:
+            if move[0] == 's':
+                pos[1] += 1
+            else:
+                pos[1] -= 1
+            if move[1] == 'w':
+                pos[0] -= 1
+            else:
+                pos[0] += 1
+    return tuple(pos)
+
+counts = {}
+
+for seq in input:
+    pos = get_pos(seq)
+    if pos not in counts:
+        counts[pos] = 0
+    counts[pos] += 1
+
+print("Answer 1:", len([v for v in counts.values() if v % 2 == 1]))
+
+def count_adjacent(map, pos):
+    x, y = pos
+    adjacent = [(-2, 0), (2, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
+    return len([1 for (off_x, off_y) in adjacent if map.get((x + off_x, y + off_y), False)])
+
+map = {k: v % 2 == 1 for (k, v) in counts.items()}
+max_x = max([abs(x) for (x, y) in map.keys()]) + 1
+max_y = max([abs(y) for (x, y) in map.keys()]) + 1
+
+for i in range(0, 100):
+    next_map = {}
+    for x in range(-max_x, max_x + 1):
+        for y in range(-max_y, max_y + 1):
+            if (x + y) % 2 == 1:
+                continue
+            count = count_adjacent(map, (x, y))
+            if map.get((x, y), False) == True:
+                next_map[(x, y)] = count in [1, 2]
+            else:
+                next_map[(x, y)] = count == 2
+    map = next_map
+    max_y += 1
+    max_x += 2
+    #print("Day {}: {}".format(i + 1, sum([1 for v in map.values() if v])))
+
+print("Answer 2:", sum([1 for v in map.values() if v]))

24.small.input

@@ -0,0 +1,20 @@
+sesenwnenenewseeswwswswwnenewsewsw
+neeenesenwnwwswnenewnwwsewnenwseswesw
+seswneswswsenwwnwse
+nwnwneseeswswnenewneswwnewseswneseene
+swweswneswnenwsewnwneneseenw
+eesenwseswswnenwswnwnwsewwnwsene
+sewnenenenesenwsewnenwwwse
+wenwwweseeeweswwwnwwe
+wsweesenenewnwwnwsenewsenwwsesesenwne
+neeswseenwwswnwswswnw
+nenwswwsewswnenenewsenwsenwnesesenew
+enewnwewneswsewnwswenweswnenwsenwsw
+sweneswneswneneenwnewenewwneswswnese
+swwesenesewenwneswnwwneseswwne
+enesenwswwswneneswsenwnewswseenwsese
+wnwnesenesenenwwnenwsewesewsesesew
+nenewswnwewswnenesenwnesewesw
+eneswnwswnwsenenwnwnwwseeswneewsenese
+neswnwewnwnwseenwseesewsenwsweewe
+wseweeenwnesenwwwswnew