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ghosterator200 VAX/MAXXED  1yr ago (text post) Edited 1yr ago 385 thread views #131849

day 16 aoc thread: the np is complete

this is travelling salesmen, eh? i'm pretty sure at least.

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Goddamn this one was a fucking nightmare. I thought I was hot shit realizing that you can turn the problem into travelling salesman based on the shortest paths between all nonzero valves since you can reasonably assume you'll be beelining between them at all times, but figuring out how to adapt to multiple salesmen took me ages despite it being fairly simple in the end. Just glad I squeezed through the filter tbh.

import re

class Valve:
    def __init__(self, id, name, flow):
        self.name = name
        self.id = id
        self.flow = flow
        self.out_dir = []

foo, valves, valves_of_interest = [], [], []
start_valve = None
with open('day16_input.txt', 'r') as inp:
    foo = inp.read().split('\n')

for f in range(len(foo)):
    foo[f] = re.split(' |=', foo[f].replace(',','').replace(';',''))
    valves.append(Valve(f, foo[f][1], int(foo[f][5])))
    if foo[f][1] == 'AA':
        start_valve = valves[-1]
    elif int(foo[f][5]) > 0:
        valves_of_interest.append(valves[-1])
for f in range(len(foo)):
    for v in range(len(foo)):
        if f != v and valves[v].name in foo[f][10:]:
            valves[v].out_dir.append(valves[f])

dist = [[1000 for x in range(len(valves))] for y in range(len(valves))]
for v in valves:
    dist[v.id][v.id] = 0
    check = [v]
    n = 1
    while len(check) > 0:
        for c in range(len(check)):
            for o in check[0].out_dir:
                if dist[v.id][o.id] > n:
                    dist[v.id][o.id] = n
                    check.append(o)
            check = check[1:]
        n += 1

solutions = []
def max_pressure(current_valve, score, elapsed, visited, turn_count, record_sols):
    if record_sols:
        global solutions
        solutions.append([score, visited])
    vals = []
    for v in valves_of_interest:
        time_after = dist[current_valve.id][v.id]+elapsed+1
        if v is not current_valve and time_after <= turn_count and v.id not in visited:
            vals.append(max_pressure(v, score+(v.flow*(turn_count-time_after)), time_after, visited + [v.id], turn_count, record_sols))
    if len(vals) == 0:
        return score
    return max(vals)

print(max_pressure(start_valve, 0, 0, [], 30, False)) 

m = 0
count = 0
max_pressure(start_valve, 0, 0, [], 26, True)
for s in solutions:
    second_go = max_pressure(start_valve, s[0], 0, s[1], 26, False)
    if second_go > m:
        m = second_go
print(m)
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You sat down and wrote all this shit. You could have done so many other things with your life. What happened to your life that made you decide writing novels of bullshit here was the best option?

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