{"blog_title":"inamori\u2019s diary","image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Finamori.hateblo.jp%2Fentry%2F20110817%2Fp1\" title=\"Scala\u3067Project Euler\uff0870\uff09 - inamori\u2019s diary\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","width":"100%","provider_name":"Hatena Blog","description":"Problem 40\u3053\u306e\u554f\u984c\u306fIterator\u3092\u4f7f\u3046\u3068\u7c21\u5358\u3067\u3059\u306d\u3002Stream\u3060\u3068\u30e1\u30e2\u30ea\u3092\u4f7f\u3063\u3066\u3057\u307e\u3046\u306f\u305a\u3067\u3059\u3002 def digits(n :Int) :List[Int] = if(n == 0) Nil else n % 10 :: digits(n / 10) def f(k :Int) = { val it = Iterator.from(1).flatMap(n => digits(n).reverse.toIterator) it.slice(k - 1, k).next } val N = 7 val ds = Iterator.iterate(1)(_ * 10).take(N\u2026","categories":["Scala"],"published":"2011-08-17 00:00:00","blog_url":"https://inamori.hateblo.jp/","title":"Scala\u3067Project Euler\uff0870\uff09","height":"190","type":"rich","author_url":"https://blog.hatena.ne.jp/inamori/","version":"1.0","author_name":"inamori","url":"https://inamori.hateblo.jp/entry/20110817/p1","provider_url":"https://hatena.blog"}