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This repository was archived by the owner on Sep 20, 2025. It is now read-only.

Commit a3b9c88

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Day 21 Ruby solutions
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‎21-1.rb‎

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#!/usr/bin/env ruby
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$monkeys = {}
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class Monkey
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def initialize(name, operation)
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number_format = /^(?<num>[[:digit:]]+)$/
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calc_format = /^(?<m1>[[:alpha:]]+) (?<op>[-+*\/]) (?<m2>[[:alpha:]]+)$/
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@operation = operation
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@name = name
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@value = nil
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if m = number_format.match(@operation)
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@value = m['num'].to_i
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else
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m = calc_format.match(@operation)
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@m1 = m['m1']
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@op = m['op']
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@m2 = m['m2']
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end
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end
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def value
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return @value if @value
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@value = $monkeys[@m1].value.send(@op, $monkeys[@m2].value)
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end
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def to_s
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"<#{self.class}: #{@name} = #{@operation} (#{@value})>"
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end
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alias inspect to_s
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end
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input = File.read('21.input').lines
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monkey_format = /^(?<name>[[:alpha:]]+): (?<op>.*)$/
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input.each do |line|
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m = monkey_format.match line
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$monkeys[m['name']] = Monkey.new(m['name'], m['op'])
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end
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print $monkeys['root'].value, "\n"

‎21-2.rb‎

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#!/usr/bin/env ruby
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$monkeys = {}
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class IsHuman < ::StandardError
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end
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class Monkey
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def initialize(name, operation)
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number_format = /^(?<num>[[:digit:]]+)$/
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calc_format = /^(?<m1>[[:alpha:]]+) (?<op>[-+*\/=]) (?<m2>[[:alpha:]]+)$/
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@operation = operation
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@name = name
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@value = nil
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if m = number_format.match(@operation)
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@value = m['num'].to_i
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else
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m = calc_format.match(@operation)
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@m1 = m['m1']
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@op = m['op']
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@op = '==' if @name == 'root'
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@m2 = m['m2']
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end
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end
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def value
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raise IsHuman if setting? and @name == 'humn'
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return @value if @value
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@value = $monkeys[@m1].value.send(@op, $monkeys[@m2].value)
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end
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def set_equal!(value)
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if @name == 'humn'
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@value = value
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return
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end
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begin
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left = $monkeys[@m1].value
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rescue IsHuman
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left = nil
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end
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begin
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right = $monkeys[@m2].value
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rescue IsHuman
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right = nil
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end
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case @op
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when '=='
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$monkeys[@m1].set_equal!(right) if right
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$monkeys[@m2].set_equal!(left) if left
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when '+'
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$monkeys[@m1].set_equal!(value - right) if right
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$monkeys[@m2].set_equal!(value - left) if left
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when '-'
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$monkeys[@m1].set_equal!(value + right) if right
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$monkeys[@m2].set_equal!(left - value) if left
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when '*'
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$monkeys[@m1].set_equal!(value / right) if right
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$monkeys[@m2].set_equal!(value / left) if left
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when '/'
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$monkeys[@m1].set_equal!(value * right) if right
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$monkeys[@m2].set_equal!(left / value) if left
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end
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end
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def to_s
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"<#{self.class}: #{@name} = #{@operation} (#{@value})>"
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end
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alias inspect to_s
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def self.setting=(maybe)
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@@setting = maybe
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end
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def self.setting
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@@setting ||= false
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end
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private
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def setting?
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self.class.setting
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end
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end
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input = File.read('21.input').lines
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monkey_format = /^(?<name>[[:alpha:]]+): (?<op>.*)$/
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input.each do |line|
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m = monkey_format.match line
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$monkeys[m['name']] = Monkey.new(m['name'], m['op'])
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end
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Monkey.setting = true
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$monkeys['root'].set_equal! nil
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Monkey.setting = false
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print $monkeys['humn'].value, "\n"

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