Created
December 1, 2011 13:36
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うわっ…私の二分探索ショボすぎ…？
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| require "rubygems" | |
| require "rest-client" | |
| OFFSET = 700 | |
| STEP = 100 | |
| def exist?(url) | |
| res = RestClient.head url | |
| res.code == 200 | |
| rescue | |
| false | |
| end | |
| def p_exist?(url) | |
| exist?(url).tap{|e|puts "#{url} => #{e ? 'exist' : 'not exist'}"} | |
| end | |
| def url(i) | |
| "http://nakamurahiroki.com/neet/img/%07d.jpg" % i | |
| end | |
| max = OFFSET | |
| max += STEP while p_exist?(url(max)) | |
| min = [0, max - STEP].max | |
| puts "min = #{min}, max = #{max}" | |
| while max-min>1 | |
| i = ((min + max) / 2.0).ceil | |
| if p_exist?(url(i)) | |
| min = i | |
| else | |
| max = i | |
| end | |
| puts "min = #{min}, max = #{max}" | |
| end | |
| puts "max url: #{url(max)}" | |
| open("nenshu.html", "w+") do |f| | |
| f.puts <<-END | |
| <html> | |
| <head></head> | |
| <body> | |
| END | |
| (max..1).each do |i| | |
| f.puts %Q!<img src="#{url(i)}" width="425" height="425" />! | |
| end | |
| f.puts <<-END | |
| </body> | |
| </html> | |
| END | |
| end |
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