|
|
@@ -0,0 +1,78 @@
|
|
|
+#!/usr/bin/env python3
|
|
|
+import sys
|
|
|
+import re
|
|
|
+from itertools import islice
|
|
|
+
|
|
|
+W = 101
|
|
|
+H = 103
|
|
|
+
|
|
|
+def walk(robots):
|
|
|
+ positions, velocities = zip(*((r[:2], r[2:]) for r in robots))
|
|
|
+ while True:
|
|
|
+ positions = [((x + dx) % W, (y + dy) % H)
|
|
|
+ for (x, y), (dx, dy) in zip(positions, velocities)]
|
|
|
+ yield positions
|
|
|
+
|
|
|
+def safety(positions):
|
|
|
+ quadrants = [0, 0, 0, 0]
|
|
|
+ midx = W // 2
|
|
|
+ midy = H // 2
|
|
|
+ for x, y in positions:
|
|
|
+ if x != midx and y != midy:
|
|
|
+ quadrants[(x > midx) + 2 * (y > midy)] += 1
|
|
|
+ a, b, c, d = quadrants
|
|
|
+ return a * b * c * d
|
|
|
+
|
|
|
+def show(positions, start, stride):
|
|
|
+ step = start
|
|
|
+ for pos in map(set, islice(positions, start - 1, None, stride)):
|
|
|
+ for y in range(H):
|
|
|
+ print(''.join('.X'[(x, y) in pos] for x in range(W)))
|
|
|
+ print('step', step)
|
|
|
+ input('click ENTER for next step')
|
|
|
+ step += stride
|
|
|
+
|
|
|
+positions = walk(tuple(map(int, re.findall(r'-?\d+', line)))
|
|
|
+ for line in sys.stdin)
|
|
|
+print(safety(next(islice(positions, 99, None, 1))))
|
|
|
+
|
|
|
+#with open('input/14', 'r') as f:
|
|
|
+# robots = [tuple(map(int, re.findall(r'-?\d+', line))) for line in f]
|
|
|
+#positions = walk(robots)
|
|
|
+#show(positions, 129, 101)
|
|
|
+
|
|
|
+# Easter egg looks like this in step 7502:
|
|
|
+#
|
|
|
+# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
|
|
|
+# X.............................X
|
|
|
+# X.............................X
|
|
|
+# X.............................X
|
|
|
+# X.............................X
|
|
|
+# X..............X..............X
|
|
|
+# X.............XXX.............X
|
|
|
+# X............XXXXX............X
|
|
|
+# X...........XXXXXXX...........X
|
|
|
+# X..........XXXXXXXXX..........X
|
|
|
+# X............XXXXX............X
|
|
|
+# X...........XXXXXXX...........X
|
|
|
+# X..........XXXXXXXXX..........X
|
|
|
+# X.........XXXXXXXXXXX.........X
|
|
|
+# X........XXXXXXXXXXXXX........X
|
|
|
+# X..........XXXXXXXXX..........X
|
|
|
+# X.........XXXXXXXXXXX.........X
|
|
|
+# X........XXXXXXXXXXXXX........X
|
|
|
+# X.......XXXXXXXXXXXXXXX.......X
|
|
|
+# X......XXXXXXXXXXXXXXXXX......X
|
|
|
+# X........XXXXXXXXXXXXX........X
|
|
|
+# X.......XXXXXXXXXXXXXXX.......X
|
|
|
+# X......XXXXXXXXXXXXXXXXX......X
|
|
|
+# X.....XXXXXXXXXXXXXXXXXXX.....X
|
|
|
+# X....XXXXXXXXXXXXXXXXXXXXX....X
|
|
|
+# X.............XXX.............X
|
|
|
+# X.............XXX.............X
|
|
|
+# X.............XXX.............X
|
|
|
+# X.............................X
|
|
|
+# X.............................X
|
|
|
+# X.............................X
|
|
|
+# X.............................X
|
|
|
+# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
|
Taddeus Kroes