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yokohama.rb#70 に出した問題の実装例(ruby)

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yokohama.rb#70( https://yokohamarb.doorkeeper.jp/events/45057 )で、いわゆる「どう書く」をやりました。

問題の方は http://nabetani.sakura.ne.jp/yokohamarb/2016.07.ront/

です。
実際のところ、以前出した http://nabetani.sakura.ne.jp/hena/ord5railsontiles/ のリメイクです。

で。

会場で紹介した実装例を。

def solve( src )
  map = [nil]*5+[*?a..?p].each_slice(4).map{ |x| [x, nil ] }.flatten+[nil]*5
  cur=[5+1,5]
  seq=map[cur[0]]
  m={ 1=>5, 5=>1, -1=>-5, -5=>-1 }
  loop do
    case src[cur[0]-5 ]
    when "0"; cur[1] = -m[cur[1]]
    when "1"; cur[1] = m[cur[1]]
    when "2"; cur[1] = cur[1]
    when "3"; return seq
    end
    cur[0]+=cur[1]
    return seq unless map[cur[0]]
    seq += map[cur[0]]
  end
end

def test( src, expected )
  actual = solve( src )
  okay = actual == expected
  p [ okay ? "ok" : "**NG**", src,actual, expected ]
end

test( "0113/1201/2201/2100", "bcgfeabfjnoklpo" ) # 0    
test( "0211/1200/2220/2103", "bfjnokghdc" ) # 30

テストデータの大半は省略。

実装方針としては、

  • 地図は 1次元で持つ。
  • 盤面の外に出たかどうかを、番兵で判断する

というもの。

when "2" の代入文は不要なんだけど、なんとなく書いてみた。

他の方の実装や感想は

などをご覧いただければと思う。

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