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def op(cmd, regs)
regs2 = regs.dup
case cmd[0]
when :addr; regs2[cmd[3]] = regs[cmd[1]] + regs[cmd[2]]
when :addi; regs2[cmd[3]] = regs[cmd[1]] + cmd[2]
when :mulr; regs2[cmd[3]] = regs[cmd[1]] * regs[cmd[2]]
when :muli; regs2[cmd[3]] = regs[cmd[1]] * cmd[2]
when :banr; regs2[cmd[3]] = regs[cmd[1]] & regs[cmd[2]]
when :bani; regs2[cmd[3]] = regs[cmd[1]] & cmd[2]
when :borr; regs2[cmd[3]] = regs[cmd[1]] | regs[cmd[2]]
when :bori; regs2[cmd[3]] = regs[cmd[1]] | cmd[2]
when :setr; regs2[cmd[3]] = regs[cmd[1]]
when :seti; regs2[cmd[3]] = cmd[1]
when :gtir; regs2[cmd[3]] = cmd[1] > regs[cmd[2]] ? 1 : 0
when :gtri; regs2[cmd[3]] = regs[cmd[1]] > cmd[2] ? 1 : 0
when :gtrr; regs2[cmd[3]] = regs[cmd[1]] > regs[cmd[2]] ? 1 : 0
when :eqri; regs2[cmd[3]] = regs[cmd[1]] == cmd[2] ? 1 : 0
when :eqir; regs2[cmd[3]] = cmd[1] == regs[cmd[2]] ? 1 : 0
when :eqrr; regs2[cmd[3]] = regs[cmd[1]] == regs[cmd[2]] ? 1 : 0
end
regs2
end
OPS = [:addr, :addi, :mulr, :muli, :banr, :bani, :borr, :bori, :setr, :seti,
:gtri, :gtir, :gtrr, :eqri, :eqir, :eqrr]
OPS.each { |o|
if op([o, 2, 1, 2], [3, 2, 1, 1]) == [3, 2, 2, 1]
p o
end
}
p1 = 0
poss = Array.new(16) { OPS }
code = nil
File.read("day16").split("\n\n").each { |samp|
if samp =~ /^Before:/
x = samp.lines.map { |l| l.scan(/\[.*?\]/) }
before = eval(x[0].first)
unop, *args = samp.lines[1].split(' ').map(&:to_i)
after = eval(x[2].first)
n = OPS.find_all { |o|
op([o, *args], before) == after
}
poss[unop] &= n
if n.size >= 3
p1 += 1
end
else
code = samp
end
}
p p1
require 'pp'
pp poss
loop {
det = poss.find_all { |p| p.size == 1 }.flatten
break if det.size == 16
poss.each_index { |i|
poss[i] -= det unless poss[i].size == 1
}
}
poss.map!(&:first)
p poss
regs = [0,0,0,0]
code.each_line { |l|
numop, *args = l.split(' ').map(&:to_i)
regs = op([poss[numop], *args], regs)
}
p regs[0]
__END__
Before: [3, 2, 1, 1]
9 2 1 2
After: [3, 2, 2, 1]
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