day06.rb

def part1
  times, distances = input_lines.map { |line| line.scan(/\d+/).map(&:to_i) }
  calculate_wins(times.zip(distances))
end

def part2
  calculate_wins([input_lines.map { |line| line.delete("^0-9").to_i }])
end

def calculate_wins(races)
  races.map { |time, distance| (1...time).count { |hold| (time - hold) * hold > distance } }.reduce(:*)
end