day 13

13/13.py

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+import numpy as np
+
+with open("input") as file:
+	lines = file.read().splitlines()
+	splitIndex = lines.index("")
+	dotList = np.array([lines[i].split(",") for i in range(splitIndex)], dtype=int)
+	col, row = dotList.T
+	maxX = np.max(col)
+	maxY = np.max(row)
+	dotGrid = np.zeros((maxY + 1, maxX + 1), bool)
+	dotGrid[row, col] = True
+	foldInstructions = [lines[i].split(" ")[2].split("=") for i in range(splitIndex + 1, len(lines))]
+
+
+def fold(grid, instructions: list):
+	for axis, amount in instructions:
+		amount = int(amount)
+		if axis == "x":
+			part1 = grid[:, :amount]
+			part2 = grid[:, amount + 1:]
+			part2Flipped = np.fliplr(part2)
+		else:
+			part1 = grid[:amount]
+			part2 = grid[amount + 1:]
+			part2Flipped = np.flipud(part2)
+		grid = part1 + part2Flipped
+		print(np.count_nonzero(grid))
+
+
+fold(dotGrid, foldInstructions)
+# Found part 2 by accident with PyCharms Array View

13/input

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+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6

13/testInput

@@ -0,0 +1,21 @@
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+
+fold along y=7
+fold along x=5