Created
December 8, 2020 05:52
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Advent of Code 2020: Day 8 - Handheld Halting
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require 'benchmark' | |
class Instruction | |
attr_reader :operation, :argument | |
def self.fix(instruction) | |
new(instruction.operation == 'nop' ? 'jmp' : 'nop', instruction.argument) | |
end | |
def initialize(operation, argument) | |
self.operation = operation | |
self.argument = argument | |
end | |
private | |
attr_writer :operation, :argument | |
end | |
class Program | |
def self.from_lines(lines) | |
Program.new(lines.map { |line| Instruction.new(*line.split(' ')) }) | |
end | |
def initialize(instructions) | |
self.instructions = instructions | |
self.pointer = 0 | |
self.accumulator = 0 | |
self.ran = {} | |
end | |
def current | |
self[pointer] | |
end | |
def ran_to_completion? | |
pointer >= instructions.length || pointer < 0 | |
end | |
def ran_current_instruction? | |
self.ran[self.pointer] | |
end | |
def fork | |
ForkedProgram.new(instructions, pointer, accumulator, ran) | |
end | |
def run! | |
return accumulator if ran_to_completion? | |
return false if ran_current_instruction? | |
if forkable? | |
forked_result = fork.run! | |
return forked_result if forked_result != false | |
end | |
mark_as_ran! | |
case current.operation | |
when 'nop' | |
self.pointer += 1 | |
when 'acc' | |
self.accumulator += current.argument.tr('+', '').to_i | |
self.pointer += 1 | |
when 'jmp' | |
self.pointer += current.argument.tr('+', '').to_i | |
else | |
raise "Unknown operation #{current.operation}(#{current.argument})" | |
end | |
run! | |
end | |
protected | |
attr_accessor :instructions, :pointer, :accumulator, :ran | |
def forked? | |
false | |
end | |
private | |
def [](instruction) | |
instructions[instruction] | |
end | |
def []=(instruction, replacement) | |
instructions[instruction] = replacement | |
end | |
def mark_as_ran! | |
ran[pointer] = true | |
end | |
def forkable? | |
return false if forked? | |
current.operation == 'nop' || current.operation == 'jmp' | |
end | |
end | |
class ForkedProgram < Program | |
def initialize(instructions, pointer, accumulator, ran) | |
self.instructions = instructions.dup | |
self.ran = ran.dup | |
self.pointer = pointer | |
self.accumulator = accumulator | |
fix! | |
end | |
def fork | |
raise "Can't fork a forked program" | |
end | |
protected | |
def forked? | |
true | |
end | |
private | |
def fix! | |
self[pointer] = Instruction.fix(current) | |
end | |
end | |
instructions = File | |
.read('input.txt') | |
.split(/\n/) | |
Benchmark.bmbm do |b| | |
b.report do | |
program = Program.from_lines(instructions) | |
puts program.run! | |
end | |
end |
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nop +0 | |
acc +1 | |
jmp +4 | |
acc +3 | |
jmp -3 | |
acc -99 | |
acc +1 | |
jmp -4 | |
acc +6 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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jmp +1 | |
acc -18 | |
acc +19 | |
acc +19 | |
jmp +202 | |
acc +15 | |
acc +42 | |
acc +30 | |
acc -7 | |
jmp +535 | |
acc +31 | |
acc +9 | |
jmp +581 | |
nop +501 | |
acc +44 | |
acc +18 | |
acc -4 | |
jmp +545 | |
acc +9 | |
acc +5 | |
nop -2 | |
acc +3 | |
jmp +475 | |
acc -10 | |
acc +14 | |
acc +29 | |
nop +471 | |
jmp +470 | |
acc +2 | |
nop +375 | |
acc +31 | |
acc +6 | |
jmp +420 | |
acc -1 | |
acc +2 | |
nop +185 | |
jmp +490 | |
acc +2 | |
jmp +317 | |
nop +282 | |
jmp +457 | |
acc +37 | |
jmp +254 | |
acc +19 | |
jmp +436 | |
jmp +458 | |
acc -7 | |
acc -2 | |
acc -17 | |
jmp +454 | |
acc +37 | |
jmp +212 | |
acc +6 | |
acc +5 | |
acc -7 | |
jmp +104 | |
acc +5 | |
nop +134 | |
acc +46 | |
jmp +541 | |
acc +4 | |
acc +46 | |
acc +18 | |
jmp -53 | |
acc +10 | |
jmp +285 | |
acc +39 | |
acc +34 | |
nop +109 | |
acc +47 | |
jmp +32 | |
jmp +1 | |
jmp +143 | |
acc +36 | |
jmp +429 | |
acc +45 | |
acc +22 | |
jmp -59 | |
acc +0 | |
acc +23 | |
acc +30 | |
acc -7 | |
jmp -45 | |
acc +46 | |
acc +31 | |
jmp +164 | |
acc +37 | |
acc +34 | |
acc +40 | |
acc -1 | |
jmp +246 | |
nop -46 | |
acc +2 | |
acc +31 | |
jmp +221 | |
nop +413 | |
jmp -51 | |
acc -14 | |
jmp +145 | |
acc +1 | |
nop +77 | |
jmp +131 | |
jmp +370 | |
nop +513 | |
acc +7 | |
jmp +476 | |
acc +22 | |
acc +37 | |
acc +44 | |
jmp +334 | |
acc +9 | |
acc -1 | |
acc +5 | |
acc +27 | |
jmp +351 | |
acc +31 | |
jmp +220 | |
nop -61 | |
acc +34 | |
jmp +504 | |
nop +471 | |
acc +6 | |
acc +48 | |
jmp -17 | |
jmp +217 | |
acc +13 | |
acc +0 | |
acc +25 | |
jmp +144 | |
acc -5 | |
acc +17 | |
nop +341 | |
jmp -26 | |
acc -10 | |
acc +34 | |
jmp +168 | |
nop -16 | |
acc -6 | |
acc -10 | |
acc +38 | |
jmp +30 | |
acc -2 | |
acc -14 | |
jmp +419 | |
acc +40 | |
acc -17 | |
acc +27 | |
acc +8 | |
jmp +101 | |
nop +370 | |
acc +2 | |
acc -10 | |
acc -7 | |
jmp +224 | |
nop +437 | |
acc +42 | |
acc +50 | |
acc +39 | |
jmp +81 | |
jmp +11 | |
jmp +143 | |
acc +6 | |
acc +46 | |
jmp -107 | |
acc +13 | |
jmp -109 | |
acc +5 | |
jmp +1 | |
jmp +467 | |
jmp -159 | |
nop +421 | |
jmp +243 | |
acc +44 | |
nop +412 | |
acc -6 | |
acc +13 | |
jmp +56 | |
acc -12 | |
acc +18 | |
jmp +313 | |
nop +151 | |
acc +5 | |
acc +49 | |
jmp +120 | |
acc +46 | |
acc +23 | |
nop -122 | |
acc +21 | |
jmp -55 | |
acc -15 | |
jmp -115 | |
acc +19 | |
nop +116 | |
acc +32 | |
acc +21 | |
jmp +16 | |
acc +27 | |
acc +32 | |
jmp +359 | |
acc +16 | |
acc +18 | |
acc +15 | |
jmp +54 | |
nop +182 | |
acc +4 | |
jmp +361 | |
acc +4 | |
acc +38 | |
acc +49 | |
jmp -94 | |
jmp +428 | |
acc +0 | |
acc +9 | |
jmp +224 | |
jmp +82 | |
nop +57 | |
acc +6 | |
jmp +1 | |
jmp +144 | |
jmp +20 | |
jmp +265 | |
jmp +402 | |
nop +114 | |
acc -12 | |
acc -11 | |
acc +1 | |
jmp +412 | |
nop -163 | |
acc +50 | |
acc +1 | |
acc -9 | |
jmp -20 | |
acc +10 | |
acc +6 | |
jmp +323 | |
acc +10 | |
jmp +1 | |
acc +42 | |
jmp +46 | |
acc +35 | |
acc +31 | |
jmp -139 | |
jmp +129 | |
jmp -193 | |
acc -4 | |
nop +247 | |
nop -163 | |
acc +25 | |
jmp -26 | |
acc +34 | |
acc +26 | |
acc +40 | |
jmp +220 | |
acc -6 | |
acc +6 | |
jmp +311 | |
acc +0 | |
acc +14 | |
acc +41 | |
acc +6 | |
jmp +284 | |
acc +32 | |
jmp -13 | |
nop +157 | |
acc -4 | |
acc +47 | |
jmp -146 | |
acc +34 | |
acc +6 | |
nop +196 | |
acc +5 | |
jmp +268 | |
acc -8 | |
jmp -176 | |
acc +34 | |
acc +17 | |
jmp +1 | |
jmp +114 | |
acc +32 | |
acc +39 | |
nop +313 | |
acc +38 | |
jmp -237 | |
jmp -273 | |
acc +21 | |
acc +26 | |
acc +31 | |
jmp -231 | |
acc +17 | |
jmp -105 | |
nop +333 | |
nop +17 | |
jmp +11 | |
acc -9 | |
acc +2 | |
jmp -162 | |
acc +3 | |
acc +0 | |
nop +318 | |
jmp +215 | |
acc +14 | |
acc +32 | |
jmp -196 | |
jmp +33 | |
acc -6 | |
acc +45 | |
acc +27 | |
jmp -166 | |
acc -1 | |
jmp -25 | |
acc +0 | |
acc +4 | |
acc -14 | |
acc +0 | |
jmp -115 | |
nop +118 | |
acc +28 | |
nop +175 | |
acc +45 | |
jmp -97 | |
jmp +78 | |
jmp -284 | |
acc +35 | |
nop -248 | |
acc -18 | |
acc -6 | |
jmp -308 | |
jmp -95 | |
acc -2 | |
acc +0 | |
jmp +255 | |
acc +7 | |
jmp -24 | |
acc +17 | |
acc +20 | |
jmp -220 | |
jmp +172 | |
acc +40 | |
acc +39 | |
acc +19 | |
jmp -238 | |
nop +44 | |
nop -99 | |
nop +238 | |
jmp +195 | |
acc -14 | |
acc +36 | |
acc +40 | |
acc -11 | |
jmp -65 | |
nop -54 | |
nop +47 | |
acc -11 | |
jmp +18 | |
jmp +98 | |
jmp +252 | |
nop -1 | |
acc +1 | |
acc +10 | |
jmp -4 | |
jmp -319 | |
jmp -46 | |
acc -8 | |
acc +50 | |
acc +43 | |
jmp -174 | |
acc +22 | |
acc +4 | |
acc +32 | |
acc -6 | |
jmp +73 | |
acc +8 | |
jmp -31 | |
acc +16 | |
nop +11 | |
acc +26 | |
jmp -98 | |
acc -11 | |
acc +40 | |
jmp +101 | |
acc +28 | |
acc +30 | |
acc -16 | |
acc +7 | |
jmp +239 | |
jmp -179 | |
acc +47 | |
acc +15 | |
acc +42 | |
acc +26 | |
jmp +30 | |
acc +17 | |
acc +3 | |
acc -5 | |
nop -98 | |
jmp -236 | |
acc +2 | |
jmp +196 | |
acc +39 | |
acc -14 | |
acc +36 | |
acc +49 | |
jmp +189 | |
jmp +235 | |
acc +27 | |
acc -2 | |
acc +16 | |
acc +40 | |
jmp -81 | |
acc -5 | |
acc +17 | |
acc -1 | |
jmp +1 | |
jmp -129 | |
nop -171 | |
acc +47 | |
jmp +169 | |
acc -16 | |
acc -5 | |
jmp +172 | |
nop -84 | |
acc +8 | |
acc +40 | |
acc +43 | |
jmp -33 | |
acc +39 | |
nop -12 | |
jmp +53 | |
acc +36 | |
jmp -270 | |
acc +17 | |
acc -1 | |
jmp -255 | |
acc +0 | |
acc -12 | |
jmp -371 | |
jmp -216 | |
acc +45 | |
acc -18 | |
acc +23 | |
acc -17 | |
jmp -37 | |
jmp -386 | |
nop -302 | |
acc -19 | |
acc -16 | |
jmp -297 | |
acc -18 | |
acc -7 | |
acc +17 | |
acc +17 | |
jmp -173 | |
jmp +114 | |
acc +4 | |
acc +19 | |
nop -296 | |
jmp -36 | |
acc -18 | |
acc -14 | |
acc +6 | |
nop -27 | |
jmp -101 | |
acc +15 | |
nop -407 | |
jmp +44 | |
acc -18 | |
acc -6 | |
acc +33 | |
acc +36 | |
jmp +80 | |
acc +43 | |
jmp +73 | |
acc -2 | |
acc +7 | |
acc +4 | |
jmp -10 | |
acc +46 | |
nop -49 | |
acc +7 | |
jmp +65 | |
acc +24 | |
jmp +144 | |
acc +13 | |
acc +26 | |
jmp -351 | |
jmp +1 | |
acc +34 | |
nop +62 | |
jmp -363 | |
acc -4 | |
acc -5 | |
jmp +23 | |
jmp +82 | |
acc -7 | |
acc -7 | |
acc +15 | |
jmp -468 | |
acc +7 | |
nop -423 | |
jmp -178 | |
nop -425 | |
acc +23 | |
jmp -181 | |
acc +6 | |
acc -11 | |
jmp -321 | |
acc +3 | |
jmp -122 | |
acc +12 | |
jmp +44 | |
acc -5 | |
acc -16 | |
acc +16 | |
jmp -281 | |
acc +33 | |
acc -4 | |
acc +15 | |
jmp +9 | |
jmp +63 | |
acc +35 | |
nop -12 | |
acc +25 | |
acc -10 | |
jmp -452 | |
acc +1 | |
jmp -148 | |
acc +8 | |
acc +40 | |
acc +48 | |
jmp +2 | |
jmp -315 | |
nop -325 | |
acc -4 | |
acc +16 | |
acc -4 | |
jmp -369 | |
acc +21 | |
acc +3 | |
jmp -153 | |
nop -25 | |
acc +0 | |
jmp -84 | |
acc +32 | |
jmp +19 | |
acc -18 | |
acc -1 | |
jmp -385 | |
jmp +1 | |
jmp -357 | |
acc -13 | |
acc -13 | |
jmp -360 | |
jmp -393 | |
acc +4 | |
nop -102 | |
jmp -316 | |
jmp -248 | |
acc +4 | |
nop -487 | |
jmp -339 | |
acc +3 | |
jmp -190 | |
acc +24 | |
acc +31 | |
jmp -166 | |
jmp -482 | |
acc +22 | |
acc +32 | |
jmp -290 | |
acc +22 | |
acc +48 | |
acc +5 | |
acc -6 | |
jmp -330 | |
nop -203 | |
acc +7 | |
acc +1 | |
jmp -287 | |
acc +15 | |
acc +3 | |
jmp -230 | |
acc +37 | |
nop -162 | |
jmp +33 | |
jmp -147 | |
acc +16 | |
acc +39 | |
acc +49 | |
jmp -560 | |
acc +26 | |
jmp +26 | |
jmp -283 | |
jmp -486 | |
acc -9 | |
jmp +1 | |
acc +25 | |
acc +1 | |
jmp -514 | |
acc +46 | |
jmp -166 | |
acc -5 | |
acc +35 | |
nop -204 | |
jmp -175 | |
nop -30 | |
nop +11 | |
jmp -400 | |
acc +15 | |
acc -7 | |
acc -1 | |
jmp +18 | |
acc +31 | |
acc +16 | |
acc +43 | |
acc +33 | |
jmp -260 | |
acc +1 | |
acc +23 | |
acc +25 | |
acc -1 | |
jmp -200 | |
acc -15 | |
jmp -314 | |
jmp -238 | |
jmp -75 | |
jmp -192 | |
acc +30 | |
jmp -525 | |
acc -14 | |
jmp +17 | |
acc +7 | |
acc +9 | |
acc -6 | |
nop -312 | |
jmp -559 | |
acc +28 | |
jmp -305 | |
jmp -239 | |
acc +0 | |
acc -5 | |
acc +9 | |
jmp -471 | |
nop -327 | |
acc -5 | |
acc -19 | |
jmp -496 | |
acc +17 | |
jmp +1 | |
jmp +1 | |
acc +29 | |
jmp +1 |
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