Advent of code, day 1

day1.rb

#!/usr/bin/env ruby

# Advent of code, day 1
# http://adventofcode.com/day/2

input = File.read("input")
floors = Enumerator.new do |yielder|
  floor = 0
  input.chars.each do |c|
    floor += case c
             when "(" then 1
             when ")" then -1
             else raise
             end
    yielder.yield floor
  end
end
puts floors.to_a.last
index_where_basement_entered = floors.with_index.find do |floor, i|
  floor < 0
end.last
puts index_where_basement_entered + 1

Overengineered. Just wanted to try it with an enumeration.

@wconrad Don't you mean /day/1 on line 4?