Created
December 11, 2018 16:33
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#!/usr/bin/env python3 | |
import sys | |
import re | |
class Node: | |
def __init__ (self, value): | |
self.value = value | |
self.next = None | |
self.prev = None | |
def __repr__ (self): | |
return repr(self.value) | |
class Ring: | |
def __init__ (self): | |
self.current = Node(0) | |
self.current.next = self.current | |
self.current.prev = self.current | |
def insert (self, node): | |
node.prev = self.current | |
node.next = self.current.next | |
self.current.next.prev = node | |
self.current.next = node | |
self.current = node | |
def seek (self, n): | |
if n < 0: | |
while n < 0: | |
self.current = self.current.prev | |
n += 1 | |
else: | |
while 0 < n: | |
self.current = self.current.next | |
n -= 1 | |
def pop (self): | |
value = self.current.value | |
self.current.prev.next = self.current.next | |
self.current.next.prev = self.current.prev | |
self.current = self.current.next | |
return value | |
def __repr__ (self): | |
outp = [] | |
curr = self.current | |
while True: | |
outp.append(repr(curr)) | |
curr = curr.next | |
if curr == self.current: | |
break | |
return repr(outp) | |
def play (nplayers, highest): | |
ring = Ring() | |
scores = {} | |
player = 0 | |
for i in range(1, highest + 1): | |
if i % 23 == 0: | |
if player not in scores: | |
scores[player] = 0 | |
ring.seek(-7) | |
scores[player] += i + ring.pop() | |
else: | |
ring.seek(1) | |
ring.insert(Node(i)) | |
player = (player + 1) % nplayers | |
#print(ring, scores, scores[max(scores)]) | |
return scores[max(scores)] | |
def parse (s): | |
specre = re.compile('(\d+) players; last marble is worth (\d+) points') | |
return map(int, specre.match(s).group(1, 2)) | |
def main (): | |
nplayers, highest = parse(sys.stdin.read()) | |
print(play(nplayers, highest)) | |
if __name__ == '__main__': | |
assert(play(9, 25) == 32) | |
assert(play(10, 1618) == 8317) | |
assert(play(13, 7999) == 146373) | |
assert(play(17, 1104) == 2764) | |
assert(play(21, 6111) == 54718) | |
assert(play(30, 5807) == 37305) | |
main() |
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