atomaka/advent-of-code-2024
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Day twenty-four Part two

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This commit is contained in:
Andrew Tomaka 2024-12-27 22:54:11 -05:00
parent 3da106ed46
commit 0726c374f2
Signed by: atomaka
GPG key ID: 61209BF70A5B18BE
1 changed files with 42 additions and 1 deletions
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43
24/main.rb Normal file → Executable file
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@ -10,6 +10,46 @@ input[...split]
.map { _1.split(": ") }
.each { wires[_1] = _2.to_i }
flipped = Set.new
gates.select { _1.match?(/XOR/) }.each do |gate|
in1, op, in2, out = gate.scan(/([a-z0-9]{3}) ([A-Z]+) ([a-z0-9]{3}) -> ([a-z0-9]{3})/).first
if op == "XOR" && [in1, in2].map { _1[0] }.sort != %w[x y]
if !out.start_with?("z")
flipped << out
end
end
end
# 45 is a half adder
(0..44).each do |num|
z = "z#{'%02d' % num}"
gate = gates.find { _1.match?(/#{z}$/) }
in1, op, in2, out = gate.scan(/([a-z0-9]{3}) ([A-Z]+) ([a-z0-9]{3}) -> ([a-z0-9]{3})/).first
if op != "XOR"
flipped << z
end
end
gates.select { _1.match?(/AND/) }.each do |gate|
in1, op, in2, out = gate.scan(/([a-z0-9]{3}) ([A-Z]+) ([a-z0-9]{3}) -> ([a-z0-9]{3})/).first
if [in1, in2].map { _1[0] }.sort == %w[x y] && in1 != "x00"
if gates.find { _1.match?(/#{out}/) && _1.match?(/ OR /) }.nil?
flipped << out
end
end
end
gates.select { _1.match?(/XOR/) }.each do |gate|
in1, op, in2, out = gate.scan(/([a-z0-9]{3}) ([A-Z]+) ([a-z0-9]{3}) -> ([a-z0-9]{3})/).first
if [in1, in2].map { _1[0] }.sort == %w[x y] && in1 != "x00" && in1 != "y00"
if gates.count { _1.match?(/#{out}/) && _1.match?(/ XOR /) } != 2
flipped << out
end
end
end
i = 0
until gates.empty?
@ -44,6 +84,8 @@ z = wires.select { _1.match?(/^z/) }.sort_by(&:first).map { _1.last.to_s }.rever
zi = z.to_i(2)
p zi
p flipped.sort.join(",")
__END__
x00: 0
x01: 1
@ -64,4 +106,3 @@ x02 AND y02 -> z01
x03 AND y03 -> z03
x04 AND y04 -> z04
x05 AND y05 -> z00