Day 23

day23/part2.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+from tqdm import tqdm
+
+
+class Node:
+    value = None
+    next = None
+
+    def __init__(self, value, next):
+        self.value = value
+        self.next = next
+
+
+num = [list(map(int, (char for char in x.strip()))) for x in open("input.txt")][0]
+num = num + list(range(len(num)+1, 1000000+1))
+MAX = len(num)
+
+nodes = dict()
+nodes[num[-1]] = curr = last = Node(num[-1], None)
+for n in num[-2::-1]:
+    nodes[n] = curr = Node(n, curr)
+last.next = curr
+
+for _ in tqdm(range(10000000)):
+    pickups = []
+    lp = curr
+    for j in range(3):
+        lp = lp.next
+        pickups.append(lp.value)
+    ap = lp.next
+
+    destination = curr.value
+    while True:
+        destination -= 1
+        if destination == 0:
+            destination = MAX
+        if destination not in pickups:
+            break
+    dst = nodes[destination]
+    lp.next = dst.next
+    dst.next = curr.next
+    curr.next = ap
+    curr = curr.next
+
+while curr.value != 1:
+    curr = curr.next
+curr = curr.next
+res = curr.value
+curr = curr.next
+res *= curr.value
+
+print(res)