49 lines
1.1 KiB
Python
49 lines
1.1 KiB
Python
|
#!/usr/bin/env python
|
||
|
|
# 2024 - Advent Of Code 5
|
||
|
|
|
||
|
|
from math import floor
|
||
|
|
|
||
|
|
# file = 'input_example.txt'
|
||
|
|
file = 'input.txt'
|
||
|
|
|
||
|
|
updates = []
|
||
|
|
rules = {}
|
||
|
|
update = 0
|
||
|
|
with open(file, encoding="utf-8") as f:
|
||
|
|
for line in f.read().splitlines():
|
||
|
|
if line == '':
|
||
|
|
update = 1
|
||
|
|
continue
|
||
|
|
if update == 0:
|
||
|
|
before, after = line.split('|')
|
||
|
|
if int(before) in rules:
|
||
|
|
l = rules[int(before)]
|
||
|
|
l.append(int(after))
|
||
|
|
rules[int(before)] = l
|
||
|
|
else:
|
||
|
|
rules[int(before)] = [int(after)]
|
||
|
|
else:
|
||
|
|
updates.append([int(x) for x in line.split(',')])
|
||
|
|
|
||
|
|
#print(f'{rules=}')
|
||
|
|
#print(f'{updates=}')
|
||
|
|
|
||
|
|
good_updates = []
|
||
|
|
for update in updates:
|
||
|
|
broken_rule = False
|
||
|
|
for num, page in enumerate(update):
|
||
|
|
if page in rules:
|
||
|
|
for p in rules[page]:
|
||
|
|
if p in update[0:num]:
|
||
|
|
broken_rule = True
|
||
|
|
break
|
||
|
|
if not broken_rule:
|
||
|
|
good_updates.append(update)
|
||
|
|
|
||
|
|
accum = 0
|
||
|
|
print(f'# good_updates {len(good_updates)}')
|
||
|
|
for u in good_updates:
|
||
|
|
accum += u[floor(len(u)/2)]
|
||
|
|
|
||
|
|
print(f'{accum=}')
|