day13.py

@@ -7,33 +7,31 @@ from typing import Any
 def get_reflection_value(grid: Grid, ignore: int = 0) -> int:
     # search horizontal
     for x in grid.rangeX():
-        nx = x + 1
         col = grid.get_column(x)
-        if col == grid.get_column(nx):
+        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(nx + dx):
+                if grid.get_column(x - dx) != grid.get_column(x + dx + 1):
                     match = False
                     break
-            if match and nx != ignore:
-                return nx
+            if match and x + 1 != ignore:
+                return x + 1
 
     # search vertical
     for y in grid.rangeY():
-        ny = y + 1
         row = grid.get_row(y)
-        if row == grid.get_row(ny):
+        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(ny + dy):
+                if grid.get_row(y - dy) != grid.get_row(y + dy + 1):
                     match = False
                     break
-            if match and 100 * ny != ignore:
-                return 100 * ny
+            if match and 100 * (y + 1) != ignore:
+                return 100 * (y + 1)
 
     return -1
 
@@ -42,12 +40,10 @@ class Day(AOCDay):
     inputs = [
         [
             (405, "input13_test"),
-            (30158, "input13_dennis"),
             (32035, "input13"),
         ],
         [
             (400, "input13_test"),
-            (36474, "input13_dennis"),
             (24847, "input13"),
         ],
     ]
@@ -62,13 +58,16 @@ class Day(AOCDay):
     def part2(self) -> Any:
         grids = self.parse_input()
         ref_value = 0
-        for grid in grids:
+        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)
-                    grid.set(c, "." if grid.get(c) == "#" else "#")
+                    if grid.get(c) == "#":
+                        grid.set(c, ".")
+                    else:
+                        grid.set(c, "#")
 
                     v = get_reflection_value(grid, orig_ref)
                     if v > 0:
@@ -76,7 +75,10 @@ class Day(AOCDay):
                         found = True
                         break
 
-                    grid.set(c, "." if grid.get(c) == "#" else "#")
+                    if grid.get(c) == "#":
+                        grid.set(c, ".")
+                    else:
+                        grid.set(c, "#")
 
                 if found:
                     break