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44 lines
1006 B
44 lines
1006 B
8 years ago
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class Assembunny
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attr_reader :data
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def initialize(data)
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@data = data
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end
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def run(input)
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return enum_for(__method__, input) unless block_given?
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registers = { ?a => input, ?b => 0, ?c => 0, ?d => 0 }
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pc = 0
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while pc < data.size
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line = data[pc]
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case line
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when /cpy ([a-d]|\d+) ([a-d])/
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value = registers.fetch($1) { $1.to_i }
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registers[$2] = value
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pc += 1
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when /inc ([a-d])/
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registers[$1] += 1
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pc += 1
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when /dec ([a-d])/
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registers[$1] -= 1
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pc += 1
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when /jnz ([a-d]|\d+) (-?\d+)/
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value = registers.fetch($1) { $1.to_i }
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pc += value.zero? ? 1 : $2.to_i
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when /out ([a-d])/
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yield registers.fetch($1)
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pc += 1
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else
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raise "invalid line: #{line}"
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end
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end
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end
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end
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assembunny = Assembunny.new(ARGF.read.split("\n"))
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needle = ('01' * 6).chars.map(&:to_i)
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puts (1..Float::INFINITY).find {|i| assembunny.run(i).take(12) == needle }
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