2020 day 24 as exercise

2020_24/24.py

@@ -0,0 +1,74 @@
+
+
+cmdToDir = {
+	"se": (0, -1),
+	"nw": (0, 1),
+	"sw": (-1, -1),
+	"ne": (1, 1),
+	"e": (1, 0),
+	"w": (-1, 0)
+}
+
+
+def getPos(c: str):
+	commands = []
+	i = 0
+	while i < len(c):
+		if c[i] in ("s", "n"):
+			commands.append(c[i:i + 2])
+			i += 2
+		elif c[i] in ("w", "e"):
+			commands.append(c[i])
+			i += 1
+	x, y = 0, 0
+	for command in commands:
+		dx, dy = cmdToDir[command]
+		x += dx
+		y += dy
+	return x, y
+
+
+def solveTask1(codes):
+	blacks = set()
+	for code in codes:
+		pos = getPos(code)
+		if pos in blacks:
+			blacks.remove(pos)
+		else:
+			blacks.add(pos)
+	return blacks
+
+
+def getAdjacent(pos):
+	x, y = pos
+	adjacent = [(x + dx, y + dy) for dx, dy in cmdToDir.values()]
+	return set(adjacent)
+
+
+def solveTask2(codes):
+	blacks = solveTask1(codes)
+
+	for _ in range(100):
+
+		flipsToBlack, flipsToWhite = set(), set()
+
+		for blackTile in blacks:
+			adjacent = getAdjacent(blackTile)
+			adjacentAndBlack = adjacent.intersection(blacks)
+			if len(adjacentAndBlack) == 0 or len(adjacentAndBlack) > 2:
+				flipsToWhite.add(blackTile)
+			for whiteTile in adjacent.difference(blacks):
+				adjacentAndBlack = getAdjacent(whiteTile).intersection(blacks)
+				if len(adjacentAndBlack) == 2:
+					flipsToBlack.add(whiteTile)
+
+		blacks = blacks.difference(flipsToWhite).union(flipsToBlack)
+
+	return blacks
+
+
+with open("input") as file:
+	rawCodes = file.read().splitlines()
+
+print(len(solveTask1(rawCodes)))
+print(len(solveTask2(rawCodes)))

2020_24/input

@@ -0,0 +1,496 @@
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2020_24/testInput

@@ -0,0 +1,20 @@
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