day 9

2018/09.py

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+from collections import deque
+import re
+
+
+def simulate(num_players, last_marble):
+    circle = deque([0])
+    players = [0 for i in range(num_players)]
+    current_turn = 1
+    while current_turn <= last_marble:
+        current_player = (current_turn % len(players)) - 1
+        
+        if current_turn % 23 == 0:
+            players[current_player] += current_turn
+            circle.rotate(7)
+            players[current_player] += circle.popleft()
+        else:
+            circle.rotate(-2)
+            circle.appendleft(current_turn)
+        current_turn += 1
+    return max(players)
+
+
+with open('data/09.txt') as f:
+    m = re.match(r'(\d+) players; last marble is worth (\d+) points', f.read())
+    num_players = int(m.groups()[0])
+    last_marble = int(m.groups()[1])
+
+print(f'Part 1: {simulate(num_players, last_marble)}\n')
+print(f'Part 2: {simulate(num_players, last_marble * 100)}\n')

2018/data/09.txt

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+470 players; last marble is worth 72170 points