Day 1: Historian Hysteria

Megathread guidelines

  • Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever)
  • You can send code in code blocks by using three backticks, the code, and then three backticks or use something such as https://blocks.programming.dev if you prefer sending it through a URL

FAQ

  • @morrowind@lemmy.ml
    1•2 days ago

    Crystal

    f = ARGV[0]? ? File.read_lines("input.txt") : test.lines
list1 = Array(Int32).new(f.size)
list2 = Array(Int32).new(f.size)

f.each do |l|
	nums = l.split.map(&.to_i)
	list1.push(nums[0])
	list2.push(nums[1])
end

list1.sort!
list2.sort!

puts list1.zip(list2).sum{ |l1, l2| (l1 - l2).abs }

puts list1.sum {|x| x * list2.count x}