From: Phrogz <gavin@...>
Date: 2006-09-02T04:35:40+09:00
Subject: Re: Happy Numbers (#93)

Although others are sure to have better results, I thought I'd post
mine (no spoilers). I did it a simple way first, and then another more
sophisticated way second. Nice speed improvement.

The below tests 1000 numbers for happiness in 33 different bases.

range = 1..1000
require 'Benchmark'
Benchmark.bm(20){ |r|
  r.report( "Technique 1" ){
    3.upto(36){ |base|
      range.select{ |i|
        # find out if 'i' is a happy number in the supplied base
      }
    }
  }

  r.report( "Technique 2" ){
    3.upto(36){ |base|
      range.select{ |i|
        # find out if 'i' is a happy number in the supplied base
      }
    }
  }
}

                     user     system      total        real
Technique 1     19.282000   0.031000  19.313000 ( 19.359000)
Technique 2      2.140000   0.000000   2.140000 (  2.156000)