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insn = [:eqri, :seti, :eqir, :eqrr, :addi, :setr, :gtrr, :gtir, :muli, :bori, :bani, :borr, :gtri, :banr, :addr, :mulr]
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
rip, *program = File.readlines("day21")
rip = rip.scan(/\d/)[0].to_i
program.map! { |line|
o,a,b,c = line.split
[o.to_sym, a.to_i, b.to_i, c.to_i]
}
regs = [0]*6
regs[0] = 0
ip = 0
or5 = 0
seen = []
# 3_000_000.times {
loop {
break if ip < 0 || ip >= program.size
regs[rip] = ip
regs = op(program[ip], regs)
if program[ip][0] == :eqrr
p regs[5]
if seen.include? regs[5]
break
end
seen << regs[5]
end
ip = regs[rip] + 1
}
p regs
p seen
# 7224964
# 13813247 first before duplicate
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