Max overlapping ranges

PVR.rb

#!/usr/bin/env ruby

require 'csv'
require 'time'

class PeakVehicleReq
  def initialize(filename)
    @filename = 'Trips.csv'
  end

  def process
    table = parse_file
    run_scenarios(table)
    output_results(table)
  end

  private

  def parse_file
    CSV.parse(File.read(@filename), headers: true)
  end

  def run_scenarios(table)

    table.each do |row|
      row["count"] = 1
      counter = 0
      current_begin = row["Begin"].to_f
      current_end = row["End"].to_f
      division = row["Division"]

      table.each do |row|
        if current_begin >= row["Begin"].to_f && current_begin <= row["End"].to_f && division == row["Division"]
          counter += 1
        end
      end

      row["count"] = counter

    end
  end

  def output_results(table)
    CSV.open(output_filename, 'w', headers: table.headers, write_headers: true) do |csv|
      table.each { |row| csv << row }
    end
  end

  def output_filename
    File.join(
      File.dirname(@filename),
      "#{File.basename(@filename, '.csv')}_PVR.csv"
    )
  end

end

PeakVehicleReq.new(ARGV[0]).process if __FILE__ == $PROGRAM_NAME