{"id":1121,"date":"2022-06-20T00:08:27","date_gmt":"2022-06-19T15:08:27","guid":{"rendered":"https:\/\/roundwide.com\/?p=1121"},"modified":"2023-12-11T20:59:47","modified_gmt":"2023-12-11T11:59:47","slug":"split-a-list-into-sublists-of-size-n","status":"publish","type":"post","link":"https:\/\/roundwide.com\/ja\/split-a-list-into-sublists-of-size-n\/","title":{"rendered":"\u30ea\u30b9\u30c8\u3092n\u500b\u305a\u3064\u306e\u30ea\u30b9\u30c8\u306b\u5206\u5272\u3059\u308b"},"content":{"rendered":"\n<p><code>[a, b, c, d, e, f, g, h]<\/code>\u3068\u3044\u3046\u30ea\u30b9\u30c8\u30923\u500b\u305a\u3064\u306b\u5206\u5272\u3057\u3066\u3001\u6700\u5f8c\u306e\u8981\u7d20\u306f3\u500b\u4ee5\u4e0b\u306e<code>[a, b, c], [d, e, f], [g, h]<\/code>\u3068\u3044\u3046\u30ea\u30b9\u30c8\u3092\u5f97\u305f\u3044\u3068\u3059\u308b\u3002\u305d\u306e\u3068\u304dC#\u3067\u3069\u3046\u66f8\u304f\u304b\u3068\u3044\u3046\u8cea\u554f\u306e\u7b54\u3048\u3068\u3057\u3066\u4eba\u6c17\u304c\u3042\u308b\u306e\u304c\u3001\u4ee5\u4e0b\u306eLINQ\u3067\u3042\u308b\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<script type=\"text\/plain\" class=\"lang-csharp\">List<List<T>> Split<T>(this IList<T> source, int length)\n{\n    return source\n        .Select((x, i) => new { Index = i, Value = x })\n        .GroupBy(x => x.Index \/ length)\n        .Select(x => x.Select(v => v.Value).ToList())\n        .ToList();\n}<\/script>\n\n\n\n<p>stackoverflow\u3067\u306f\u4e8c\u3064\u306e\u8cea\u554f(<a rel=\"noreferrer noopener\" href=\"https:\/\/stackoverflow.com\/questions\/11463734\/split-a-list-into-smaller-lists-of-n-size\" data-type=\"URL\" data-id=\"https:\/\/stackoverflow.com\/questions\/11463734\/split-a-list-into-smaller-lists-of-n-size\" target=\"_blank\">Split a List into smaller lists of N size [duplicate]<\/a>\u3001<a href=\"https:\/\/stackoverflow.com\/questions\/419019\/split-list-into-sublists-with-linq\" data-type=\"URL\" data-id=\"https:\/\/stackoverflow.com\/questions\/419019\/split-list-into-sublists-with-linq\">Split List into Sublists with LINQ<\/a>)\u306e\u5408\u8a08\u3067900\u4ee5\u4e0a\u306eup vote\u3092\u5f97\u3066\u3044\u308b\u3002<\/p>\n\n\n\n<p>\u3057\u304b\u3057\u3001\u3053\u306e\u65b9\u6cd5\u306f\u6027\u80fd\u306e\u70b9\u3067\u306f\u6700\u60aa\u3067\u3042\u308b\u3002\u307e\u305a\u30ea\u30b9\u30c8\u306e\u8981\u7d20\u6570\u3060\u3051Index\u3068Value\u3092\u6301\u3064\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3057\u3066\u3044\u308b\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u6210\u306f\u30e1\u30e2\u30ea\u3068\u901f\u5ea6\u4e21\u9762\u3067\u3001\u3068\u3066\u3082\u30b3\u30b9\u30c8\u306e\u9ad8\u3044\u64cd\u4f5c\u3067\u3042\u308b\u3002\u305d\u308c\u3068\u6bd4\u3079\u308b\u3068\u5c0f\u3055\u306a\u30b3\u30b9\u30c8\u3067\u306f\u3042\u308b\u304c\u3001\u8981\u7d20\u306e\u6570\u3060\u3051\u9664\u7b97\u3068\u6bd4\u8f03\u3092\u884c\u3046\u306e\u3082\u6027\u80fd\u4e0a\u3088\u304f\u306a\u3044\u3002<\/p>\n\n\n\n<p>\u901f\u5ea6\u306b\u3053\u3060\u308f\u308b\u306e\u306a\u3089\u305d\u3082\u305d\u3082LINQ\u3092\u4f7f\u308f\u306a\u3051\u308c\u3070\u3044\u3044\u306e\u3060\u304c\u3001\u3082\u3057LINQ\u3067\u7c21\u6f54\u306b\u66f8\u304d\u305f\u3044\u306e\u306a\u3089\u3001\u4ee5\u4e0b\u306e\u89e3\u306f\u3069\u3046\u3060\u308d\u3046\u304b\u3002<\/p>\n\n\n\n<script type=\"text\/plain\" class=\"lang-csharp\">List<List<T>> Split<T>(this IList<T> source, int length)\n{\n    return Enumerable\n        .Range(0, (source.Count + length - 1) \/ length)\n        .Select(n => source.Skip(n * length).Take(length).ToList())\n        .ToList();\n}<\/script>\n\n\n\n<p>\u4ee5\u4e0b\u306fBenchmarkDotNet\u3067\u53d6\u3063\u305f\u30011000\u8981\u7d20\u306eint\u306e\u914d\u5217\u30923\u500b\u305a\u3064\u306b\u5206\u5272\u3059\u308b\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u306e\u7d50\u679c\u3067\u3042\u308b\u3002\u6700\u521d\u306b\u6319\u3052\u305f\u3082\u306e\u304cSplitter1\u3001\u3053\u308c\u304cSplitter2\u3067\u3042\u308b\u3002Mean\u304c\u5e73\u5747\u5024\u3067\u3001\u305d\u308c\u4ee5\u5916\u306f\u6e2c\u5b9a\u8aa4\u5dee\u3092\u8868\u3057\u3066\u3044\u308b\u3002Mean\u3092\u898b\u308b\u3068Splitter2\u304c3.5\u500d\u4ee5\u4e0a\u901f\u3044\u306e\u304c\u308f\u304b\u308b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>BenchmarkDotNet=v0.13.1, OS=Windows 10.0.19044.1766 (21H2)\nAMD Ryzen 7 3800X, 1 CPU, 16 logical and 8 physical cores\n.NET SDK=6.0.106\n  &#91;Host]  : .NET 6.0.6 (6.0.622.26707), X64 RyuJIT\n  LongRun : .NET 6.0.6 (6.0.622.26707), X64 RyuJIT\n\nJob=LongRun  IterationCount=100  LaunchCount=3  \nWarmupCount=15  <\/code><\/pre>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Method<\/th><th class=\"has-text-align-right\" data-align=\"right\">Mean<\/th><th class=\"has-text-align-right\" data-align=\"right\">Error<\/th><th class=\"has-text-align-right\" data-align=\"right\">StdDev<\/th><\/tr><\/thead><tbody><tr><td>Splitter1<\/td><td class=\"has-text-align-right\" data-align=\"right\">89.94 \u03bcs<\/td><td class=\"has-text-align-right\" data-align=\"right\">0.351 \u03bcs<\/td><td class=\"has-text-align-right\" data-align=\"right\">1.779 \u03bcs<\/td><\/tr><tr><td>Splitter2<\/td><td class=\"has-text-align-right\" data-align=\"right\">24.04 \u03bcs<\/td><td class=\"has-text-align-right\" data-align=\"right\">0.100 \u03bcs<\/td><td class=\"has-text-align-right\" data-align=\"right\">0.517 \u03bcs<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u305f\u3060\u3057\u3001.NET 6\u306b\u306fChunk\u3068\u3044\u3046\u6a19\u6e96\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001.NET 6\u4ee5\u964d\u304c\u5bfe\u8c61\u306a\u3089Chunk\u3092\u4f7f\u3046\u3079\u304d\u3060\u3002Chunk\u3092\u52a0\u3048\u3066\u4e0a\u3068\u540c\u3058\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u3092\u5b9f\u884c\u3059\u308b\u3068\u7d50\u679c\u306f\u3053\u3046\u306a\u308b\u3002Splitter2\u3068\u6bd4\u8f03\u3057\u3066\u30824,000\u500d\u4ee5\u4e0a\u901f\u3044\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Method<\/th><th class=\"has-text-align-right\" data-align=\"right\">Mean<\/th><th class=\"has-text-align-right\" data-align=\"right\">Error<\/th><th class=\"has-text-align-right\" data-align=\"right\">StdDev<\/th><\/tr><\/thead><tbody><tr><td>Splitter1<\/td><td class=\"has-text-align-right\" data-align=\"right\">88,650.102 ns<\/td><td class=\"has-text-align-right\" data-align=\"right\">245.2557 ns<\/td><td class=\"has-text-align-right\" data-align=\"right\">1,251.8625 ns<\/td><\/tr><tr><td>Splitter2<\/td><td class=\"has-text-align-right\" data-align=\"right\">23,481.503 ns<\/td><td class=\"has-text-align-right\" data-align=\"right\">117.8934 ns<\/td><td class=\"has-text-align-right\" data-align=\"right\">600.6975 ns<\/td><\/tr><tr><td>Chunk<\/td><td class=\"has-text-align-right\" data-align=\"right\">5.609 ns<\/td><td class=\"has-text-align-right\" data-align=\"right\">0.0198 ns<\/td><td class=\"has-text-align-right\" data-align=\"right\">0.0984 ns<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>[a, b, c, d, e, f, g, h]\u3068\u3044\u3046\u30ea\u30b9\u30c8\u30923\u500b\u305a\u3064\u306b\u5206\u5272\u3057\u3066\u3001\u6700\u5f8c\u306e\u8981\u7d20\u306f3\u500b\u4ee5\u4e0b\u306e[a, b, c], [d, e, f], [g, h]\u3068\u3044\u3046\u30ea\u30b9\u30c8\u3092\u5f97\u305f\u3044\u3068\u3059\u308b\u3002\u305d\u306e\u3068\u304dC#\u3067\u3069\u3046\u66f8\u304f\u304b\u3068\u3044\u3046\u8cea &hellip; <a href=\"https:\/\/roundwide.com\/ja\/split-a-list-into-sublists-of-size-n\/\" class=\"more-link\"><span class=\"screen-reader-text\">\"\u30ea\u30b9\u30c8\u3092n\u500b\u305a\u3064\u306e\u30ea\u30b9\u30c8\u306b\u5206\u5272\u3059\u308b\" \u306e<\/span>\u7d9a\u304d\u3092\u8aad\u3080<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_locale":"ja","_original_post":"https:\/\/roundwide.com\/?p=1121","footnotes":""},"categories":[10],"tags":[],"class_list":["post-1121","post","type-post","status-publish","format-standard","hentry","category-csharp","ja"],"_links":{"self":[{"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/posts\/1121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/comments?post=1121"}],"version-history":[{"count":16,"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/posts\/1121\/revisions"}],"predecessor-version":[{"id":1247,"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/posts\/1121\/revisions\/1247"}],"wp:attachment":[{"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/media?parent=1121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/categories?post=1121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/tags?post=1121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}