{"id":72,"date":"2025-09-10T21:19:18","date_gmt":"2025-09-10T13:19:18","guid":{"rendered":"https:\/\/www.xunfen.cloud\/?p=72"},"modified":"2025-09-10T21:19:18","modified_gmt":"2025-09-10T13:19:18","slug":"fish-yates%e7%ae%97%e6%b3%95","status":"publish","type":"post","link":"https:\/\/blog.xunfen.cloud\/?p=72","title":{"rendered":"fish-yates\u7b97\u6cd5"},"content":{"rendered":"\n<p>\u7531\u4e8e\u6700\u8fd1\u8001\u662f\u9694\u4e09\u5c94\u4e94\u5730\u8981\u5199\u4e00\u4e9b\u968f\u673a\u6253\u4e71\u5b57\u7b26\u7684\u4efb\u52a1\uff0c\u6bcf\u6b21\u9996\u9009\u90fd\u662ffisher-yates\u7b97\u6cd5\uff0c\u4f46\u662f\u50bb\u5b50\u98ce\u8111\u5b50\u4e0d\u592a\u7075\u5149\uff0c\u8001\u662f\u5fd8\u8bb0\u6d41\u7a0b\uff0c\u9042\u8bb0\u6b64\u535a\u5ba2\u4f5c\u4e3a\u8bb0\u5fc6\u5b58\u6863<\/p>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><strong>\u7b97\u6cd5\u7b80\u8ff0<\/strong><\/p>\n\n\n\n<p><strong>Fisher-Yates \u6d17\u724c\u7b97\u6cd5<\/strong>&nbsp;\u662f\u4e00\u79cd\u7528\u4e8e\u751f\u6210\u6709\u9650\u5e8f\u5217\u7684<strong>\u65e0\u504f\u968f\u673a\u6392\u5217<\/strong>\u7684\u7b97\u6cd5\u3002\u7b80\u5355\u8bf4\uff0c\u5b83\u80fd\u771f\u6b63\u505a\u5230\u7b49\u6982\u7387\u5730\u968f\u673a\u6253\u4e71\u4e00\u4e2a\u6570\u7ec4\u3002<\/p>\n\n\n\n<p><strong>\u6838\u5fc3\u601d\u60f3\uff08\u73b0\u4ee3\u7248\u672c\uff0c\u7531 Knuth \u63d0\u51fa\uff09\uff1a<\/strong><br>\u4ece\u6570\u7ec4\u672b\u5c3e\u5f00\u59cb\uff0c\u5411\u524d\u904d\u5386\u3002\u5bf9\u4e8e\u5f53\u524d\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff08\u7d22\u5f15&nbsp;<code>i<\/code>\uff09\uff0c\u968f\u673a\u5730\u4ece\u524d\u9762\u672a\u56fa\u5b9a\u7684\u90e8\u5206\uff08\u5305\u62ec\u5b83\u81ea\u5df1\uff09\u9009\u62e9\u4e00\u4e2a\u5143\u7d20\uff08\u7d22\u5f15&nbsp;<code>j<\/code>\uff09\uff0c\u5e76\u4ea4\u6362\u5b83\u4eec\u7684\u4f4d\u7f6e\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u6bcf\u4e2a\u5143\u7d20\u5728\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\u90fd\u6709\u4e00\u6b21\u673a\u4f1a\u88ab\u653e\u7f6e\u5230\u5f53\u524d\u5e8f\u5217\u7684\u201c\u672b\u5c3e\u201d\uff0c\u8fd9\u4e2a\u201c\u672b\u5c3e\u201d\u5728\u540e\u7eed\u7684\u904d\u5386\u4e2d\u5c06\u88ab\u56fa\u5b9a\u4e0b\u6765\uff0c\u4e0d\u518d\u6539\u52a8\u3002<\/p>\n\n\n\n<p><strong>\u7b97\u6cd5\u6b65\u9aa4\uff1a<\/strong><\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>\u8bbe\u5f53\u524d\u7d22\u5f15\u00a0<code>i<\/code>\u00a0\u4e3a\u6570\u7ec4\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\uff08<code>arr.length - 1<\/code>\uff09\u3002<\/li>\n\n\n\n<li>\u5f53\u00a0<code>i > 0<\/code>\u00a0\u65f6\uff0c\u5faa\u73af\uff1a<br>a.\u00a0<strong>\u751f\u6210\u968f\u673a\u7d22\u5f15<\/strong>\u00a0<code>j<\/code>\uff1a\u8303\u56f4\u5728\u00a0<code>[0, i]<\/code>\uff08\u5305\u62ec 0 \u548c i\uff09\u4e4b\u95f4\u7684\u4e00\u4e2a\u968f\u673a\u6574\u6570\u3002<br>b.\u00a0<strong>\u4ea4\u6362\u5143\u7d20<\/strong>\uff1a\u4ea4\u6362\u6570\u7ec4\u4e2d\u7d22\u5f15\u4e3a\u00a0<code>i<\/code>\u00a0\u548c\u7d22\u5f15\u4e3a\u00a0<code>j<\/code>\u00a0\u7684\u4e24\u4e2a\u5143\u7d20\u3002<br>c.\u00a0<strong>\u7f29\u5c0f\u8303\u56f4<\/strong>\uff1a\u5c06\u00a0<code>i<\/code>\u00a0\u51cf 1\uff0c\u7f29\u5c0f\u968f\u673a\u9009\u62e9\u7684\u8303\u56f4\u3002<\/li>\n\n\n\n<li>\u5f53\u5faa\u73af\u7ed3\u675f\uff08<code>i == 0<\/code>\uff09\uff0c\u6570\u7ec4\u5df2\u88ab\u5b8c\u5168\u968f\u673a\u6253\u4e71\u3002<\/li>\n<\/ol>\n\n\n\n<p><strong>\u4e3a\u4ec0\u4e48\u5b83\u662f\u65e0\u504f\u7684\uff1f<\/strong><br>\u56e0\u4e3a\u6bcf\u4e2a\u5143\u7d20\u5728\u6bcf\u6b21\u8fed\u4ee3\u4e2d\uff0c\u88ab\u653e\u7f6e\u5230\u5f53\u524d\u201c\u672b\u5c3e\u201d\u4f4d\u7f6e\u7684\u6982\u7387\u90fd\u662f\u5b8c\u5168\u76f8\u7b49\u7684\uff08<code>1 \/ (i+1)<\/code>\uff09\u3002\u8fd9\u4fdd\u8bc1\u4e86\u603b\u5171\u00a0<code>n!<\/code>\u00a0\u79cd\u53ef\u80fd\u7684\u6392\u5217\u7ed3\u679c\uff0c\u6bcf\u4e00\u79cd\u51fa\u73b0\u7684\u6982\u7387\u90fd\u76f8\u540c\u3002<\/p>\n<\/div><\/div>\n\n\n\n<p>\uff08\u4ee5\u4e0a\u7531deepseek\u56de\u7b54\uff09<\/p>\n\n\n\n<p>\u4e8e\u6b64\uff0c\u6211\u63a8\u8350B\u7ad9\u4e0a\u4e00\u4f4dup\u4e3b\u7684\u4e00\u671f\u89c6\u9891\u5bf9\u6b64\u7b97\u6cd5\u6709\u8f83\u4e3a\u8be6\u5c3d\u7684\u4ecb\u7ecd\uff0c\u4e0d\u8fc7\u6f14\u793a\u7684\u662fjs\uff0c\u65e0\u4f24\u5927\u96c5\u5427<\/p>\n\n\n\n<p><a href=\"https:\/\/www.bilibili.com\/video\/BV1qq4y1V7x1\/?spm_id_from=333.337.search-card.all.click&amp;vd_source=fcdcd6a377111329435f4974f7aef75e\">\u3010\u9762\u8bd5\u9898\u3011\u7ecf\u5178\u6d17\u724c\u7b97\u6cd5JS\u5b9e\u73b0\uff1bFisher-Yates\u7b97\u6cd5\uff1b\u6570\u7ec4\u968f\u673a\u7b97\u6cd5_\u54d4\u54e9\u54d4\u54e9_bilibili<\/a><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u4ee5\u4e0b\uff0c\u7531\u4e8e\u9119\u4eba\u6700\u8fd1\u5728\u7528java\u5199\u4efb\u52a1\uff0c\u5c31\u987a\u5e26\u9644\u52a0\u4e00\u4e2ajava\u5b9e\u73b0\u6b64\u7b97\u6cd5\u7684\u4f8b\u5b50\u5427<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Random;\/\/\u5bfc\u5305\n\npublic class Test {\n    public static void main(String&#91;] args) {\n        int&#91;] arr = {1,2,3,4,5,6,7,8,9,10};\n        Random r = new Random();\n        int temp;\/\/\u5b9a\u4e49\u4e34\u65f6\u53d8\u91cf\n        for (int i = arr.length - 1; i > 0; i--) {\/\/\u5199\u4e00\u4e2a\u5faa\u73af\u7528\u4e8e\u6253\u4e71\u6570\u7ec4\n            int index = r.nextInt(i + 1);\n            temp = arr&#91;i];\n            arr&#91;i] = arr&#91;index];\n            arr&#91;index] = temp;\n        }\n\n        \/\/\u8f93\u51fa\u6570\u7ec4\u67e5\u770b\u6253\u4e71\u6548\u679c\n        for (int i = 0; i &lt; arr.length; i++) {\n            System.out.print(arr&#91;i] + \" \");\n        }\n    }\n    \n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u7531\u4e8e\u6700\u8fd1\u8001\u662f\u9694\u4e09\u5c94\u4e94\u5730\u8981\u5199\u4e00\u4e9b\u968f\u673a\u6253\u4e71\u5b57\u7b26\u7684\u4efb\u52a1\uff0c\u6bcf\u6b21\u9996\u9009\u90fd\u662ffisher-yates\u7b97\u6cd5\uff0c\u4f46\u662f\u50bb\u5b50\u98ce\u8111\u5b50\u4e0d\u592a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3,2],"tags":[],"class_list":["post-72","post","type-post","status-publish","format-standard","hentry","category-java","category-2"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/blog.xunfen.cloud\/index.php?rest_route=\/wp\/v2\/posts\/72","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.xunfen.cloud\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.xunfen.cloud\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.xunfen.cloud\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.xunfen.cloud\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=72"}],"version-history":[{"count":0,"href":"https:\/\/blog.xunfen.cloud\/index.php?rest_route=\/wp\/v2\/posts\/72\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.xunfen.cloud\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=72"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.xunfen.cloud\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=72"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.xunfen.cloud\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=72"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}