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  <author_name>itto100pen</author_name>
  <author_url>https://blog.hatena.ne.jp/itto100pen/</author_url>
  <blog_title>らむだ畑でつかまえて (catcher in the λ)</blog_title>
  <blog_url>https://itto100pen.hatenadiary.org/</blog_url>
  <categories>
    <anon>Haskell</anon>
  </categories>
  <description>Haskell で数独ソルバを書いてみた。 特徴は ・明示的な再帰は使わず (iterate ...) !! 81 を使った。（８１手目に解が求まる） ・探索中のマス目状態を、未確定部分と仮確定部分に分けて持つ。 import List (partition,delete) mark (pos@(i,j),d) cand = (cand1++) $ filter (not.null.snd) $ map del cand2 where (cand1,cand2) = partition p cand p ((k,l),_) = k /= i &amp;&amp; l /= j &amp;&amp; map (`div`3) …</description>
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  <image_url></image_url>
  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2009-06-04 22:20:32</published>
  <title> 数独ソルバ</title>
  <type>rich</type>
  <url>https://itto100pen.hatenadiary.org/entry/20090604/1244121632</url>
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