{"id":2378,"date":"2010-05-24T00:56:26","date_gmt":"2010-05-23T15:56:26","guid":{"rendered":"http:\/\/blog.tksk.net\/?p=2378"},"modified":"2010-05-24T01:32:08","modified_gmt":"2010-05-23T16:32:08","slug":"project-euler-scala-8","status":"publish","type":"post","link":"https:\/\/blog.tksk.net\/?p=2378","title":{"rendered":"Project Euler + Scala #8"},"content":{"rendered":"<p>\u4eca\u66f4\u3060\u308d\u3046\u304c Project Euler \u3063\u3066\u3044\u3046\u6570\u5b66\u306e\u554f\u984c\u304c\u5927\u91cf\u306b\u96c6\u3081\u3089\u308c\u305f\u30b5\u30a4\u30c8\u304c\u3042\u308b\u3002<\/p>\n<p>\u305d\u308c\u3092 Scala \u3067\u89e3\u304f\u306e\u304c\u3059\u3054\u304f\u697d\u3057\u3044\u3002\u4f8b\u3048\u3070\u3053\u3093\u306a\u554f\u984c\u3002<\/p>\n<p>#8 \u300cFind the greatest product of five consecutive digits in the 1000-digit  number. (1000\u6841\u306e\u6570\u5b57\u306e\u4e2d\u304b\u3089\u9023\u7d9a\u3059\u308b 5 \u6841\u306e\u6570\u5b57\u3092\u9078\u3073\u51fa\u3057\u3001\u305d\u306e\u5404\u6841(5)\u306e\u7a4d\u3092\u8003\u3048\u308b\u3002\u3053\u306e\u3068\u304d\u6700\u5927\u306e\u3082\u306e\u3092\u6c42\u3081\u3088\u3002)\u300d<\/p>\n<pre>\/\/ Scala 2.8 or higher required\r\nval str1000digits = \"731671765313306249192251196744265747...\" \/\/ \u7701\u7565\r\nstr1000digits.sliding(5).map(v =&gt; v.map(_.asDigit).product).max<\/pre>\n<p>\u3053\u3093\u3060\u3051\u3002\u666e\u6bb5 Java \u3068\u304b\u4f7f\u3063\u3066\u308b\u4eba\u306f\u3001\u30b3\u30fc\u30c9\u3067\u66f8\u3044\u305f\u3089\u3069\u3046\u306a\u308b\u304b\u8003\u3048\u3066\u307f\u3066\u307b\u3057\u3044\u3002(Ruby \u3068\u304b\u306a\u3089\u3082\u3063\u3068\u77ed\u3044\u304b\u3082\u3057\u308c\u306a\u3044)<\/p>\n<p>\u4ffa\u304c\u308f\u3056\u308f\u3056\u3053\u306e\u554f\u984c\u3092\u53d6\u308a\u4e0a\u3052\u305f\u306e\u306f\u3001Scala \u3067\u30a8\u30ec\u30ac\u30f3\u30c8\u306b\u66f8\u3051\u308b\u3063\u3066\u3053\u3068\u304c\u307e\u305a\u3042\u308b\u3002\u305d\u3057\u3066\u4f55\u3088\u308a\u554f\u984c\u6587(\u82f1\u6587)\u3092\u9006\u304b\u3089\u8aad\u3093\u3067\u3044\u304f\u3068\u3001\u307b\u3068\u3093\u3069\u30b3\u30fc\u30c9\u305d\u306e\u307e\u307e\u306b\u306a\u308b\u3068\u3053\u308d\u304c\u6c17\u306b\u5165\u3063\u305f\u304b\u3089\u3002\u3063\u3066\u304b\u3001\u65e5\u672c\u8a9e\u306e\u5834\u5408\u306f\u305d\u306e\u307e\u307e\u3060\u3002\u3053\u3046\u3044\u3046\u306e\u306f\u3068\u3066\u3082\u7d20\u6575\u3060\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u66f4\u3060\u308d\u3046\u304c Project Euler \u3063\u3066\u3044\u3046\u6570\u5b66\u306e\u554f\u984c\u304c\u5927\u91cf\u306b\u96c6\u3081\u3089\u308c\u305f\u30b5\u30a4\u30c8\u304c\u3042\u308b\u3002 \u305d\u308c\u3092 Scala \u3067\u89e3\u304f\u306e\u304c\u3059\u3054\u304f\u697d\u3057\u3044\u3002\u4f8b\u3048\u3070\u3053\u3093\u306a\u554f\u984c\u3002 #8 \u300cFind the greatest product o [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,23],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.tksk.net\/index.php?rest_route=\/wp\/v2\/posts\/2378"}],"collection":[{"href":"https:\/\/blog.tksk.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.tksk.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.tksk.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.tksk.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2378"}],"version-history":[{"count":6,"href":"https:\/\/blog.tksk.net\/index.php?rest_route=\/wp\/v2\/posts\/2378\/revisions"}],"predecessor-version":[{"id":2380,"href":"https:\/\/blog.tksk.net\/index.php?rest_route=\/wp\/v2\/posts\/2378\/revisions\/2380"}],"wp:attachment":[{"href":"https:\/\/blog.tksk.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.tksk.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.tksk.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}