Added solution for 2023/Day 21

.github/src/postprocess.py

@@ -21,7 +21,7 @@ def main():
             for changed_path in json.load(file):
                 changed_path = mkpath('../../', changed_path)
                 while changed_path:
-                    changed.add(changed_path)
+                    changed.add(os.path.abspath(changed_path))
                     changed_path = os.path.dirname(changed_path)
 
     print('Changed files:', changed)
@@ -41,7 +41,7 @@ def main():
             if not day.solved:
                 continue
 
-            if changed and day.path not in changed:
+            if changed and os.path.abspath(day.path) not in changed:
                 print(f"Skipping day {day.year}/{day.folder_name} as it wasn't changed")
                 continue
 

2023/Day 21/input.txt

@@ -0,0 +1,131 @@
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+...............#....#........###.......#....................................#.................#...........#.........#..#...........
+.......#......#..#.....#.........#.........#............#.......................#..#........#...#..#.....#.......#.............#...
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+....#.....#....#......#...#...#...................#..##.................#..........##.##...............#..........##...............
+...................................................................................................................................

2023/Day 21/part1.py

@@ -0,0 +1,35 @@
+DIRECTIONS = [(-1, 0), (0, 1), (1, 0), (0, -1)]
+STEPS = 64
+
+
+with open('input.txt') as file:
+    garden = list(filter(None, map(str.strip, file)))
+
+width, height = len(garden[0]), len(garden)
+
+plots = set([next(
+    (y, x)
+    for y, row in enumerate(garden)
+    for x, plot in enumerate(row)
+    if plot == 'S'
+)])
+
+ans = [[False] * width for _ in range(height)]
+
+for step in range(STEPS - 1, -1, -1):
+    new_plots = set()
+
+    for y, x in plots:
+        for dy, dx in DIRECTIONS:
+            new_y = y + dy
+            new_x = x + dx
+            if 0 <= new_y < height and 0 <= new_x < width and garden[new_y][new_x] != '#' and not ans[new_y][new_x]:
+                new_plots.add((new_y, new_x))
+
+    if step % 2 == 0:
+        for y, x in new_plots:
+            ans[y][x] = True
+
+    plots = new_plots
+
+print(sum(sum(row) for row in ans))