Day 13

day13.py

@@ -0,0 +1,91 @@
+from tools.aoc import AOCDay
+from tools.coordinate import Coordinate
+from tools.grid import Grid
+from typing import Any
+
+
+def get_reflection_value(grid: Grid, ignore: int = 0) -> int:
+    # search horizontal
+    for x in grid.rangeX():
+        col = grid.get_column(x)
+        if col == grid.get_column(x + 1):
+            match = True
+            for dx in range(1, grid.maxX - x):
+                if x - dx < 0:
+                    break
+                if grid.get_column(x - dx) != grid.get_column(x + dx + 1):
+                    match = False
+                    break
+            if match and x + 1 != ignore:
+                return x + 1
+
+    # search vertical
+    for y in grid.rangeY():
+        row = grid.get_row(y)
+        if row == grid.get_row(y + 1):
+            match = True
+            for dy in range(1, grid.maxY - y):
+                if y - dy < 0:
+                    break
+                if grid.get_row(y - dy) != grid.get_row(y + dy + 1):
+                    match = False
+                    break
+            if match and 100 * (y + 1) != ignore:
+                return 100 * (y + 1)
+
+    return -1
+
+
+class Day(AOCDay):
+    inputs = [
+        [
+            (405, "input13_test"),
+            (32035, "input13"),
+        ],
+        [
+            (400, "input13_test"),
+            (24847, "input13"),
+        ],
+    ]
+
+    def parse_input(self) -> list[Grid]:
+        return [Grid.from_data(pattern) for pattern in self.getMultiLineInputAsArray()]
+
+    def part1(self) -> Any:
+        grids = self.parse_input()
+        return sum([get_reflection_value(grid) for grid in grids])
+
+    def part2(self) -> Any:
+        grids = self.parse_input()
+        ref_value = 0
+        for i, grid in enumerate(grids):
+            orig_ref = get_reflection_value(grid)
+            found = False
+            for x in grid.rangeX():
+                for y in grid.rangeY():
+                    c = Coordinate(x, y)
+                    if grid.get(c) == "#":
+                        grid.set(c, ".")
+                    else:
+                        grid.set(c, "#")
+
+                    v = get_reflection_value(grid, orig_ref)
+                    if v > 0:
+                        ref_value += v
+                        found = True
+                        break
+
+                    if grid.get(c) == "#":
+                        grid.set(c, ".")
+                    else:
+                        grid.set(c, "#")
+
+                if found:
+                    break
+
+        return ref_value
+
+
+if __name__ == "__main__":
+    day = Day(2023, 13)
+    day.run(verbose=True)

inputs/input13_test

@@ -0,0 +1,15 @@
+#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
+
+#...##..#
+#....#..#
+..##..###
+#####.##.
+#####.##.
+..##..###
+#....#..#