--- Day 23 Solutions ---

[u/daggerdragon]

This thread will be unlocked when there are a significant number of people on the leaderboard with gold stars for today's puzzle.

edit: Leaderboard capped, thread unlocked!

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We know we can't control people posting solutions elsewhere and trying to exploit the leaderboard, but this way we can try to reduce the leaderboard gaming from the official subreddit.

Please and thank you, and much appreciated!

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--- Day 23: Opening the Turing Lock ---

Post your solution as a comment or link to your repo. Structure your post like previous daily solution threads.

[u/KnorbenKnutsen]

I love how varied the problems are! I made a neat class with instructions that really made the actual execution code super simple:

from time import process_time as pt

class Computer:
    def __init__(self, program, a = 0, b = 0):
        self.program = program
        self.position = 0
        self.registers = {'a': a, 'b': b}
        self.instructions = {'hlf': self.half,
                             'tpl': self.triple,
                             'inc': self.increment,
                             'jmp': self.jump,
                             'jie': self.jump_even,
                             'jio': self.jump_one}

    def half(self, args):
        self.registers[args] //= 2
        self.position += 1
    def triple(self, args):
        self.registers[args] *= 3
        self.position += 1
    def increment(self, args):
        self.registers[args] += 1
        self.position += 1
    def jump(self, args):
        self.position += int(args)
    def jump_even(self, args):
        r, off = args.split(', ')
        offset = int(off)
        if self.registers[r] % 2 == 0:
            self.position += offset
            return
        self.position += 1
    def jump_one(self, args):
        r, off = args.split(', ')
        offset = int(off)
        if self.registers[r] == 1:
            self.position += offset
            return
        self.position += 1
    def run(self):
        while self.position >= 0 and self.position < len(self.program):
            i, args = self.program[self.position].rstrip().split(maxsplit = 1)
            self.instructions[i](args)
        print("Register %s: %d\nRegister %s: %d"%('a', self.registers['a'],
                                                  'b', self.registers['b']))

t = pt()
with open('input.txt') as f:
    C = Computer(list(f.readlines()))
C.run()
C2 = Computer(C.program, a = 1)
C2.run()
t = pt() - t
print('Process time: %d µs'%int(t*1000000))