Zeckendorf in Ruby

Zeckendorf

in Ruby

Welcome to the Zeckendorf in Ruby page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

# frozen_string_literal: true

USAGE = "Usage: please input a non-negative integer"

def usage!
  warn USAGE
  exit 1
end

def parse_input(str)
  usage! if str.nil? || str.strip.empty?

  n = Integer(str)
  usage! if n < 0

  n
rescue ArgumentError, NoMethodError
  usage!
end

def fibs_upto(n)
  fibs = [1, 2]
  fibs << fibs[-1] + fibs[-2] while fibs[-1] <= n
  fibs.pop if fibs[-1] > n
  fibs
end

def zeckendorf(n)
  return [] if n == 0

  fibs = fibs_upto(n)
  result = []

  i = fibs.length - 1

  while n > 0
    if fibs[i] <= n
      result << fibs[i]
      n -= fibs[i]
      i -= 2
    else
      i -= 1
    end
  end

  result
end

input = ARGV.first
n = parse_input(input)

puts zeckendorf(n).join(", ")

Zeckendorf in Ruby was written by:

• Ștefan-Iulian Alecu

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.