Programming Problem from Cardinal Blue

gistfile1.rb

#############################
# Problem 1: Ruby
#

"i love to code"­.split(" ").ma­p{|x| x.rev­erse}.join­(" ")



#############################
# Problem 2: Same Digits
#
#   Ans: 142857

# start the search from 1
$num = 1;
# indicates if this is the number we want
$flag = false;

# the search will stop when a number pass all tests
until $flag == true do
  for i in (2..6)
    # test if both numbers contain exactly the same digits
    $flag = (($num.to_s.split('').sort <=> (i*$num).to_s.split('').sort) == 0);

    if $flag == false
      # this is not the number we are seaching for, move on to the next one
      $num += 1;
      break;
    end
  end
end

# output the magic number we found => 142857
puts $num;



#############################
# Problem 3: Pinterest Screen Scraping
#
#   Note: This script depends on Nokogiri(http://nokogiri.org/) to perform screen scraping

require "open-uri"
require "nokogiri"

target_url = "http://pinterest.com/piccollage/star-struck/";
result_arr = [];

# get a nokogiri HTML document for the target_url
doc = Nokogiri::HTML(open(target_url));

# get the urls of all target images
result_arr = doc.xpath('//img[@class=\'PinImageImg\']/@src')

# output the results
puts result_arr;