{"id":166,"date":"2024-11-27T20:33:08","date_gmt":"2024-11-27T12:33:08","guid":{"rendered":"http:\/\/getzs.online\/?p=166"},"modified":"2024-11-28T08:53:16","modified_gmt":"2024-11-28T00:53:16","slug":"leetcode-%e6%af%8f%e6%97%a5%e4%b8%80%e9%a2%98-24-11-27","status":"publish","type":"post","link":"https:\/\/hello.getzs.online\/index.php\/2024\/11\/27\/leetcode-%e6%af%8f%e6%97%a5%e4%b8%80%e9%a2%98-24-11-27\/","title":{"rendered":"LeetCode \u6bcf\u65e5\u4e00\u9898 24.11.27"},"content":{"rendered":"\n<p><a href=\"https:\/\/leetcode.cn\/problems\/alternating-groups-ii\/description\">3208. \u4ea4\u66ff\u7ec4 II<\/a><\/p>\n\n\n\n<p>\u7ed9\u4f60\u4e00\u4e2a\u6574\u6570\u6570\u7ec4&nbsp;<code>colors<\/code>&nbsp;\u548c\u4e00\u4e2a\u6574\u6570&nbsp;<code>k<\/code>&nbsp;\uff0c<code>colors<\/code>\u8868\u793a\u4e00\u4e2a\u7531\u7ea2\u8272\u548c\u84dd\u8272\u74f7\u7816\u7ec4\u6210\u7684\u73af\uff0c\u7b2c&nbsp;<code>i<\/code>&nbsp;\u5757\u74f7\u7816\u7684\u989c\u8272\u4e3a&nbsp;<code>colors[i]<\/code>&nbsp;\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>colors[i] == 0<\/code>&nbsp;\u8868\u793a\u7b2c&nbsp;<code>i<\/code>&nbsp;\u5757\u74f7\u7816\u7684\u989c\u8272\u662f&nbsp;<strong>\u7ea2\u8272<\/strong>&nbsp;\u3002<\/li>\n\n\n\n<li><code>colors[i] == 1<\/code>&nbsp;\u8868\u793a\u7b2c&nbsp;<code>i<\/code>&nbsp;\u5757\u74f7\u7816\u7684\u989c\u8272\u662f&nbsp;<strong>\u84dd\u8272<\/strong>&nbsp;\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u73af\u4e2d\u8fde\u7eed&nbsp;<code>k<\/code>&nbsp;\u5757\u74f7\u7816\u7684\u989c\u8272\u5982\u679c\u662f&nbsp;<strong>\u4ea4\u66ff<\/strong>&nbsp;\u989c\u8272\uff08\u4e5f\u5c31\u662f\u8bf4\u9664\u4e86\u7b2c\u4e00\u5757\u548c\u6700\u540e\u4e00\u5757\u74f7\u7816\u4ee5\u5916\uff0c\u4e2d\u95f4\u74f7\u7816\u7684\u989c\u8272\u4e0e\u5b83<strong>&nbsp;\u5de6\u8fb9<\/strong>&nbsp;\u548c&nbsp;<strong>\u53f3\u8fb9<\/strong>&nbsp;\u7684\u989c\u8272\u90fd\u4e0d\u540c\uff09\uff0c\u90a3\u4e48\u5b83\u88ab\u79f0\u4e3a\u4e00\u4e2a&nbsp;<strong>\u4ea4\u66ff<\/strong>&nbsp;\u7ec4\u3002<\/p>\n\n\n\n<p>\u8bf7\u4f60\u8fd4\u56de&nbsp;<strong>\u4ea4\u66ff<\/strong>&nbsp;\u7ec4\u7684\u6570\u76ee\u3002<\/p>\n\n\n\n<p><strong>\u6ce8\u610f<\/strong>&nbsp;\uff0c\u7531\u4e8e&nbsp;<code>colors<\/code>&nbsp;\u8868\u793a\u4e00\u4e2a&nbsp;<strong>\u73af<\/strong>&nbsp;\uff0c<strong>\u7b2c\u4e00\u5757<\/strong>&nbsp;\u74f7\u7816\u548c&nbsp;<strong>\u6700\u540e\u4e00\u5757<\/strong>&nbsp;\u74f7\u7816\u662f\u76f8\u90bb\u7684\u3002<\/p>\n\n\n\n<p><strong>\u793a\u4f8b 1\uff1a<\/strong><\/p>\n\n\n\n<p><strong>\u8f93\u5165\uff1a<\/strong>colors = [0,1,0,1,0], k = 3<\/p>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong>3<\/p>\n\n\n\n<p><strong>\u89e3\u91ca\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"http:\/\/hello.getzs.online\/wp-content\/uploads\/2024\/11\/screenshot-2024-05-28-183519.png\" alt=\"\" class=\"wp-image-169\"\/><\/figure>\n\n\n\n<p>\u4ea4\u66ff\u7ec4\u5305\u62ec\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"http:\/\/hello.getzs.online\/wp-content\/uploads\/2024\/11\/screenshot-2024-05-28-182448.png\" alt=\"\" class=\"wp-image-167\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"http:\/\/hello.getzs.online\/wp-content\/uploads\/2024\/11\/screenshot-2024-05-28-182844.png\" alt=\"\" class=\"wp-image-171\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"http:\/\/hello.getzs.online\/wp-content\/uploads\/2024\/11\/screenshot-2024-05-28-183057.png\" alt=\"\" class=\"wp-image-173\"\/><\/figure>\n\n\n\n<p><strong>\u793a\u4f8b 2\uff1a<\/strong><\/p>\n\n\n\n<p><strong>\u8f93\u5165\uff1a<\/strong>colors = [0,1,0,0,1,0,1], k = 6<\/p>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong>2<\/p>\n\n\n\n<p><strong>\u89e3\u91ca\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"http:\/\/hello.getzs.online\/wp-content\/uploads\/2024\/11\/screenshot-2024-05-28-183907.png\" alt=\"\" class=\"wp-image-172\"\/><\/figure>\n\n\n\n<p>\u4ea4\u66ff\u7ec4\u5305\u62ec\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"http:\/\/hello.getzs.online\/wp-content\/uploads\/2024\/11\/screenshot-2024-05-28-184128.png\" alt=\"\" class=\"wp-image-174\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"http:\/\/hello.getzs.online\/wp-content\/uploads\/2024\/11\/screenshot-2024-05-28-184240.png\" alt=\"\" class=\"wp-image-170\"\/><\/figure>\n\n\n\n<p><strong>\u793a\u4f8b 3\uff1a<\/strong><\/p>\n\n\n\n<p><strong>\u8f93\u5165\uff1a<\/strong>colors = [1,1,0,1], k = 4<\/p>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong>0<\/p>\n\n\n\n<p><strong>\u89e3\u91ca\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"http:\/\/hello.getzs.online\/wp-content\/uploads\/2024\/11\/screenshot-2024-05-28-184516.png\" alt=\"\" class=\"wp-image-168\"\/><\/figure>\n\n\n\n<p><strong>\u63d0\u793a\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>3 &lt;= colors.length &lt;= 10<sup>5<\/sup><\/code><\/li>\n\n\n\n<li><code>0 &lt;= colors[i] &lt;= 1<\/code><\/li>\n\n\n\n<li><code>3 &lt;= k &lt;= colors.length<\/code><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u6a21\u62df\u505a\u6cd5\uff1a<\/h2>\n\n\n\n<p>\u901a\u8fc7\u7b26\u5408\u8981\u6c42\u7d2f\u52a0\u7684\u5f62\u5f0f\uff0c\u7b26\u5408\u5219\u7d2f\u52a0\u8ba1\u7b97\u957f\u5ea6\uff08\u5373\u7b26\u5408\u7684\u4e2a\u6570\u4e3a\u957f\u5ea6m-k+1\u4e2a\uff09\uff0c\u4e0d\u7b26\u5408\u5219\u91cd\u7f6e\u4e3a1\u3002\u590d\u6742\u5ea6O(n+k)<\/p>\n\n\n\n<p>\u6ce8\uff1a\u679a\u4e3e\u957f\u5ea6\u4e3an+k-2\uff0c\u7b2c\u4e00\u6b21\u533a\u95f4\u662f[0,k-1],\u2026\u2026,\u7b2cn\u4e2a\u533a\u95f4\u662f[n-1,n+k-2]\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\tpublic int numberOfAlternatingGroups(int&#91;] colors, int k) {\n\t\tint sum = 0, ans = 1;\n\t\tint n = colors.length;\n\t\tfor (int i = 0 ; i &lt; n + k - 2 ; i++) {\n\t\t\tif (colors&#91;i % n] != colors&#91;(i + 1) % n]) {\n\t\t\t\tans++;\n\t\t\t}\n\t\t\telse {\n\t\t\t\tans = 1;\n\t\t\t}\n\t\t\tif (ans >= k) {\n\t\t\t\tsum++;\n\t\t\t}\n\t\t}\n\t\treturn sum;\n\t}<\/code><\/pre>\n\n\n\n<p>\u53ef\u91cd\u65b0\u5199\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public int numberOfAlternatingGroups(int&#91;] colors, int k) {\n\t\tint sum = 0, ans = 1;\n\t\tint n = colors.length;\n\t\tfor (int i = 0 ; i &lt; n + k - 2 ; i++) {\n\t\t\tif (colors&#91;i % n] != colors&#91;(i + 1) % n]) {\n\t\t\t\tans++;\n\t\t\t}\n\t\t\telse {\n\t\t\t\tsum += Math.max(ans - k + 1, 0);\n\t\t\t\tans = 1;\n\t\t\t}\n\t\t}\n\t\treturn sum + Math.max(ans - k + 1, 0);\n\t}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u524d\u7f00\u548c\u505a\u5dee\u505a\u6cd5\uff1a<\/h2>\n\n\n\n<p>\u5229\u7528\u524d\u7f00\u548c\u7279\u6027\uff0c\u7d2f\u8ba1\u524di\u4e2a\u7b26\u5408\u6761\u4ef6\u7684\u4e2a\u6570\uff0c\u518d\u901a\u8fc7\u8ddd\u79bbk\u505a\u5dee\u3002\u590d\u6742\u5ea6O(n+k)<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\tpublic int numberOfAlternatingGroups(int&#91;] colors, int k) {\n\t\tint n = colors.length;\n\t\tint&#91;] prefix = new int&#91;n + k - 1];\n\t\tArrays.fill(prefix, 1);\n\t\tfor (int i = 1 ; i &lt; n + k - 1 ; i++) {\n\t\t\tprefix&#91;i] = prefix&#91;i - 1] + (colors&#91;i % n] != colors&#91;(i - 1) % n] ? 1 : 0);\n\t\t}\n\t\tint sum = 0;\n\t\tfor (int i = k - 1 ; i &lt; n + k - 1 ; i++) {\n\t\t\tif (prefix&#91;i] - prefix&#91;i - k + 1] &gt;= k - 1) {\n\t\t\t\tsum++;\n\t\t\t}\n\t\t}\n\t\treturn sum;\n\t}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>3208. \u4ea4\u66ff\u7ec4 II \u7ed9\u4f60\u4e00\u4e2a\u6574\u6570\u6570\u7ec4&nbsp;colors&nbsp;\u548c\u4e00\u4e2a\u6574\u6570&nbsp;k&#038;nbs [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[5],"class_list":["post-166","post","type-post","status-publish","format-standard","hentry","category-leetcode","tag-leetcode-"],"_links":{"self":[{"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/posts\/166","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/comments?post=166"}],"version-history":[{"count":1,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/posts\/166\/revisions"}],"predecessor-version":[{"id":179,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/posts\/166\/revisions\/179"}],"wp:attachment":[{"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/media?parent=166"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/categories?post=166"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/tags?post=166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}