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-#.#...#.....#.#.....#...#.#.......#.....#.............#...#.....#.#.#.#.#.#.....................#.#...#...#...#...#...#.#...#...#...#.....#.#
-#.#.#.#####.#.#.###.###.#.#.###.#.#.###.#.#############.#######.#.#.#.#.#.#.#.###.#######.#.#.#.#.#######.#.#####.#.#.#.###.#####.#.#####.#.#
-#...#...#...#.#...................#...#.#...#...........#.......#.#...#.#.#.#...#.#.......#.....#...#...#...#.....#.#.#.....#.....#.....#.#.#
-###.###.#.###.#.#.#######.#.###.#####.#.###.#.###########.#######.#.###.#.#.###.#.###.###.#.###.#####.#.#####.#####.#.#######.#.#########.#.#
-#S......#.......#.........#...........#.....#.....................#.....#.......#.....#.....#.........#.......#.....#.........#.............#
-#############################################################################################################################################

16/main.rb

@@ -1,109 +0,0 @@
-#!/usr/bin/env ruby
-
-require "debug"
-require "matrix"
-
-@input = (ARGV.first.nil? ? DATA : ARGF)
-  .readlines(chomp: true)
-  .map(&:chars)
-start = [@input.flatten.index { _1 == "S" }]
-  .map { Vector[_1 / @input.size, _1 % @input.first.size] }
-  .first
-finish = [@input.flatten.index { _1 == "E" }]
-  .map { Vector[_1 / @input.size, _1 % @input.first.size] }
-  .first
-
-NORTH = Vector[-1, 0]
-EAST  = Vector[0, +1]
-SOUTH = Vector[+1, 0]
-WEST  = Vector[0, -1]
-DIRECTIONS = [NORTH, EAST, SOUTH, WEST]
-
-class PriorityQueue < Array
-  alias extract_min shift
-  alias peek first
-
-  def <<(v)
-    unless v.is_a?(Array)
-      raise ArgumentError, "PriorityQueue requires array with priority as last"
-    end
-
-    super
-    sort_by!(&:last)
-  end
-end
-
-def dijkstra(graph, start, start_direction, target)
-  dist = Hash.new # scores
-  prev = Hash.new
-  queue = PriorityQueue.new
-
-  queue << [start, start_direction, 0]
-  dist[[start, start_direction]] = 0
-  # alternate only inserting source and add nodes inside score check later
-
-  until queue.empty?
-    position, direction, score = queue.extract_min
-
-    neighbors = DIRECTIONS.each do |new_direction|
-      neighbor = position + new_direction
-
-      next if neighbor == position || graph.dig(*neighbor) == "#"
-
-      new_score = score + 1 + (direction == new_direction ? 0 : 1) * 1_000
-
-      if dist[[neighbor, new_direction]].nil? || new_score < dist[[neighbor, new_direction]]
-        dist[[neighbor, new_direction]] = new_score
-        prev[[neighbor, new_direction]] = [[position, direction]]
-
-        queue << [neighbor, new_direction, new_score]
-      elsif new_score == dist[[neighbor, new_direction]]
-        prev[[neighbor, new_direction]] << [position, direction]
-      end
-    end
-  end
-
-  return dist, prev
-end
-
-def seats(dist, prev, target)
-  visited, queue = Array.new, Array.new
-
-  lowest_score = dist.keys.select { |(pos, dir)| pos == target }.map { dist[_1] }.min
-  dist
-    .select { |(position, _), score| position == target && lowest_score == score }
-    .each { queue << _1.first }
-
-  until queue.empty?
-    directional_location = queue.pop
-    visited << directional_location.first
-    unless prev[directional_location].nil?
-      queue.concat(prev[directional_location])
-    end
-  end
-
-  return visited.uniq
-end
-
-dist, prev = dijkstra(@input, start, EAST, finish)
-part_1 = dist.keys.select { |(pos, dir)| pos == finish }.map { dist[_1] }.min
-p part_1
-part_2 = seats(dist, prev, finish)
-p part_2.size
-
-__END__
-###############
-#.......#....E#
-#.#.###.#.###.#
-#.....#.#...#.#
-#.###.#####.#.#
-#.#.#.......#.#
-#.#.#####.###.#
-#...........#.#
-###.#.#####.#.#
-#...#.....#.#.#
-#.#.#.###.#.#.#
-#.....#...#.#.#
-#.###.#.#.#.#.#
-#S..#.....#...#
-###############

17/input

@@ -1,5 +0,0 @@
-Register A: 17323786
-Register B: 0
-Register C: 0
-
-Program: 2,4,1,1,7,5,1,5,4,1,5,5,0,3,3,0

17/main.rb

@@ -1,80 +0,0 @@
-#!/usr/bin/env ruby
-
-input = (ARGV.first.nil? ? DATA : ARGF)
-  .readlines(chomp: true)
-split = input.index("")
-
-registers = input[...split]
-  .map { _1.split(": ").last.to_i }
-  .zip(%i[A B C]).map(&:reverse)
-  .to_h
-program = input[split+1].split(" ").last.split(",").map(&:to_i)
-
-def execute(registers, program)
-  stdout, ic = Array.new, 0
-
-  combo = ->(operand) { operand < 4 ? operand : registers.values[operand - 4] }
-
-  while ic < program.size
-    opcode, operand = program[ic], program[ic + 1]
-    ic += 2
-
-    case opcode
-    when 0 then registers[:A] = registers[:A] / 2 ** combo.(operand)
-    when 1 then registers[:B] = registers[:B] ^ operand
-    when 2 then registers[:B] = combo.(operand) % 8
-    when 3 then registers[:A] == 0 || ic = operand
-    when 4 then registers[:B] = registers[:B] ^ registers[:C]
-    when 5 then stdout << combo.(operand) % 8
-    when 6 then registers[:B] = registers[:A] / 2 ** combo.(operand)
-    when 7 then registers[:C] = registers[:A] / 2 ** combo.(operand)
-    end
-  end
-
-  stdout
-end
-
-part_1 = execute(registers.dup, program).join(",")
-p part_1
-
-def reverse_engineer(program, slot, candidate)
-  return candidate if slot < 0
-
-  candidate <<= 3 unless slot == program.size - 1
-
-  (0..7)
-    .map { [candidate + _1, execute({A: candidate + _1, B: 0, C: 0}, program)] }
-    .select { _1.last == program[slot..] }
-    .flat_map { reverse_engineer(program, slot - 1, _1.first) }
-end
-
-p reverse_engineer(program, program.size - 1, 0).sort.first
-
-# part_2 = 0
-# (program.size - 1).downto(0) do |slot|
-#   candidates = []
-#   (0..8).each do |i|
-#     candidate = part_2 + i
-#     _, _, output = execute({A: candidate, B: 0, C: 0}, program)
-#     new_program = output.split(",").map(&:to_i)
-#
-#     if new_program == program[slot..]
-#       candidates << candidate
-#       unless [301,2566855701950, 20534845615581, 20534845615573, 20534845615583].include?(candidate)
-#         part_2 = candidate
-#       end
-#     end
-#   end
-#   p candidates
-#   if slot == 0
-#     p candidates.first
-#   end
-#   part_2 <<= 3
-# end
-
-__END__
-Register A: 117440
-Register B: 0
-Register C: 0
-
-Program: 0,3,5,4,3,0