{"id":54077,"date":"2025-08-12T21:59:39","date_gmt":"2025-08-12T13:59:39","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/54077.html"},"modified":"2025-08-12T21:59:39","modified_gmt":"2025-08-12T13:59:39","slug":"leetcode3258%ef%bc%9a%e7%bb%9f%e8%ae%a1%e6%bb%a1%e8%b6%b3k%e7%ba%a6%e6%9d%9f%e7%9a%84%e5%ad%90%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%95%b0%e9%87%8f%e2%85%b0%ef%bc%88%e5%8f%98%e9%95%bf%e6%bb%91%e5%8a%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/54077.html","title":{"rendered":"leetcode3258\uff1a\u7edf\u8ba1\u6ee1\u8db3K\u7ea6\u675f\u7684\u5b50\u5b57\u7b26\u4e32\u6570\u91cf\u2160\uff08\u53d8\u957f\u6ed1\u52a8\u7a97\u53e3\u8be6\u89e3\uff09"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u4e00\u3001 \u9898\u76ee\u63cf\u8ff0<\/li>\n<li>\u4e8c\u3001 \u6838\u5fc3\u601d\u8def&#xff1a;\u53d8\u957f\u6ed1\u52a8\u7a97\u53e3 &#043; \u8ba1\u6570\u539f\u7406<\/li>\n<li>\u4e09\u3001 \u4ee3\u7801\u5b9e\u73b0\u4e0e\u6df1\u5ea6\u89e3\u6790<\/li>\n<li>\u56db\u3001 \u5173\u952e\u70b9\u4e0e\u590d\u6742\u5ea6\u5206\u6790<\/li>\n<\/ul>\n<p>LeetCode 3258 \u7edf\u8ba1\u6ee1\u8db3 K \u7ea6\u675f\u7684\u5b50\u5b57\u7b26\u4e32&#xff0c;\u3010\u96be\u5ea6&#xff1a;\u7b80\u7b54&#xff1b;\u901a\u8fc7\u7387&#xff1a;83.8%\u3011&#xff0c;\u8fd9\u9053\u9898\u4e0d\u518d\u662f\u7b80\u5355\u5730\u5bfb\u627e\u6700\u957f\/\u6700\u77ed\u6216\u6700\u4f18\u503c\u7684\u7a97\u53e3&#xff0c;\u800c\u662f\u8981\u6c42\u6211\u4eec<br \/>\n\u7edf\u8ba1\u6240\u6709\u6ee1\u8db3\u6761\u4ef6\u7684<br \/>\n\u5b50\u6570\u7ec4\u7684\u6570\u91cf\u3002\u8fd9\u9700\u8981\u6211\u4eec\u5bf9\u6ed1\u52a8\u7a97\u53e3\u7684\u7406\u89e3\u66f4\u8fdb\u4e00\u6b65&#xff0c;\u6838\u5fc3\u601d\u8def\u6ca1\u53d8&#xff0c;\u53ea\u662f\u4e0d\u80fd\u6b7b\u677f\u5957\u4e00\u4e2a\u56fa\u5b9a\u7684\u7a97\u53e3\u6765\u65e0\u8111\u904d\u5386\u4e86<\/p>\n<h2>\u4e00\u3001 \u9898\u76ee\u63cf\u8ff0<\/h2>\n<p>\u7ed9\u4f60\u4e00\u4e2a\u4e8c\u8fdb\u5236\u5b57\u7b26\u4e32 s \u548c\u4e00\u4e2a\u6574\u6570 k<\/p>\n<p>\u5982\u679c\u4e00\u4e2a\u5b50\u5b57\u7b26\u4e32\u4e2d 0 \u7684\u6570\u76ee\u81f3\u591a\u4e3a k \u4e14 1 \u7684\u6570\u76ee\u81f3\u591a\u4e3a k&#xff0c;\u5219\u79f0\u5176\u4e3a\u6ee1\u8db3 K \u7ea6\u675f\u7684\u5b50\u5b57\u7b26\u4e32<\/p>\n<p>\u8bf7\u4f60\u8fd4\u56de s \u4e2d\u6ee1\u8db3 K \u7ea6\u675f\u7684\u5b50\u5b57\u7b26\u4e32\u7684\u6570\u76ee&#xff08;\u5b50\u5b57\u7b26\u4e32 \u662f\u5b57\u7b26\u4e32\u4e2d\u8fde\u7eed\u7684 \u975e\u7a7a \u5b57\u7b26\u5e8f\u5217&#xff09;<\/p>\n<p>\u793a\u4f8b:<\/p>\n<p>\u793a\u4f8b 1:<\/p>\n<p>\u8f93\u5165&#xff1a;s &#061; &#034;10101&#034;, k &#061; 1<br \/>\n\u8f93\u51fa&#xff1a;12<\/p>\n<p>\u89e3\u91ca&#xff1a;<br \/>\ns \u7684\u6240\u6709\u5b50\u5b57\u7b26\u4e32\u4e2d&#xff0c;\u9664\u4e86 &#034;1010&#034;\u3001&#034;10101&#034; \u548c &#034;0101&#034; \u5916&#xff0c;\u5176\u4f59\u5b50\u5b57\u7b26\u4e32\u90fd\u6ee1\u8db3 k \u7ea6\u675f<\/p>\n<p>\u793a\u4f8b 2:<\/p>\n<p>\u8f93\u5165&#xff1a;s &#061; &#034;1010101&#034;, k &#061; 2<br \/>\n\u8f93\u51fa&#xff1a;25<\/p>\n<p>\u89e3\u91ca&#xff1a;<br \/>\ns \u7684\u6240\u6709\u5b50\u5b57\u7b26\u4e32\u4e2d&#xff0c;\u9664\u4e86\u957f\u5ea6\u5927\u4e8e 5 \u7684\u5b50\u5b57\u7b26\u4e32\u5916&#xff0c;\u5176\u4f59\u5b50\u5b57\u7b26\u4e32\u90fd\u6ee1\u8db3 k \u7ea6\u675f<\/p>\n<hr \/>\n<h2>\u4e8c\u3001 \u6838\u5fc3\u601d\u8def&#xff1a;\u53d8\u957f\u6ed1\u52a8\u7a97\u53e3 &#043; \u8ba1\u6570\u539f\u7406<\/h2>\n<p>\u8fd9\u9053\u9898\u7684\u6838\u5fc3\u662f\u7edf\u8ba1\u6240\u6709\u6ee1\u8db3\u6761\u4ef6\u7684\u5b50\u6570\u7ec4\u3002\u5982\u679c\u6211\u4eec\u66b4\u529b\u679a\u4e3e\u6240\u6709\u5b50\u6570\u7ec4&#xff0c;\u65f6\u95f4\u590d\u6742\u5ea6\u4f1a\u662f O(N\u00b2)&#xff0c;\u65e0\u6cd5\u63a5\u53d7\u3002\u56e0\u6b64&#xff0c;\u6211\u4eec\u81ea\u7136\u5730\u60f3\u5230\u4e86\u6ed1\u52a8\u7a97\u53e3<\/p>\n<p>\u4f46\u662f&#xff0c;\u6ed1\u52a8\u7a97\u53e3\u5982\u4f55\u7528\u6765\u201c\u8ba1\u6570\u201d\u5462&#xff1f;\u8fd9\u91cc\u6709\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u4e14\u663e\u7136\u7684\u539f\u7406&#xff1a;<\/p>\n<p>\u5982\u679c\u4e00\u4e2a\u4ee5 r \u4e3a\u53f3\u7aef\u70b9\u7684\u7a97\u53e3 [l, r] \u662f\u6ee1\u8db3\u6761\u4ef6\u7684&#xff0c;\u90a3\u4e48\u6240\u6709\u4ee5 r \u4e3a\u53f3\u7aef\u70b9\u3001\u4e14\u88ab [l, r] \u5305\u542b\u7684\u5b50\u6570\u7ec4&#xff0c;\u4e5f\u4e00\u5b9a\u6ee1\u8db3\u6761\u4ef6\u3002<\/p>\n<p>\u4f8b\u5982&#xff0c;\u5982\u679c s &#061; &#034;01101&#034;&#xff0c;k&#061;2&#xff0c;\u5f53\u6211\u4eec\u7684\u7a97\u53e3\u662f [0, 1, 1] (l&#061;0, r&#061;2) \u65f6&#xff0c;\u5b83\u662f\u6ee1\u8db3\u6761\u4ef6\u7684\u3002\u90a3\u4e48&#xff0c;\u4ee5 r&#061;2&#xff08;\u5373\u7b2c\u4e09\u4e2a \u20181\u2019&#xff09;\u7ed3\u5c3e\u7684\u3001\u6ee1\u8db3\u6761\u4ef6\u7684\u5b50\u6570\u7ec4\u6709\u54ea\u4e9b&#xff1f;<\/p>\n<ul>\n<li>[1] (\u4ece r&#061;2 \u5f00\u59cb)<\/li>\n<li>[1, 1] (\u4ece r&#061;1 \u5f00\u59cb)<\/li>\n<li>[0, 1, 1] (\u4ece r&#061;0 \u5f00\u59cb) \u603b\u5171\u6709 r &#8211; l &#043; 1 &#061; 2 &#8211; 0 &#043; 1 &#061; 3 \u4e2a<\/li>\n<\/ul>\n<p>\u57fa\u4e8e\u8fd9\u4e2a\u539f\u7406&#xff0c;\u6211\u4eec\u7684\u7b97\u6cd5\u6d41\u7a0b\u5c31\u6e05\u6670\u4e86&#xff1a;<\/p>\n<li>\u7528\u53f3\u6307\u9488 r \u904d\u5386\u5b57\u7b26\u4e32&#xff0c;\u4e0d\u65ad\u6269\u5927\u7a97\u53e3<\/li>\n<li>\u5728\u6bcf\u4e00\u6b65&#xff0c;\u6211\u4eec\u68c0\u67e5\u5f53\u524d\u7a97\u53e3 [l, r] \u662f\u5426\u6ee1\u8db3\u6761\u4ef6 (0 \u7684\u6570\u91cf &lt;&#061;k \u4e14 1 \u7684\u6570\u91cf &lt;&#061;k)<\/li>\n<li>\u5982\u679c\u4e0d\u6ee1\u8db3&#xff0c;\u6211\u4eec\u5c31\u4ece\u5de6\u8fb9\u6536\u7f29\u7a97\u53e3&#xff08;l&#043;&#043;&#xff09;&#xff0c;\u76f4\u5230\u7a97\u53e3\u91cd\u65b0\u6ee1\u8db3\u6761\u4ef6\u4e3a\u6b62<\/li>\n<li>\u5f53\u7a97\u53e3 [l, r] \u6ee1\u8db3\u6761\u4ef6\u540e&#xff0c;\u6211\u4eec\u5c31\u77e5\u9053&#xff0c;\u6240\u6709\u4ee5 r \u7ed3\u5c3e\u7684\u3001\u957f\u5ea6\u4e0d\u8d85\u8fc7 r-l&#043;1 \u7684\u5b50\u6570\u7ec4\u90fd\u6ee1\u8db3\u6761\u4ef6\u3002\u6211\u4eec\u5c06\u8fd9\u4e2a\u6570\u91cf r &#8211; l &#043; 1 \u7d2f\u52a0\u5230\u6700\u7ec8\u7ed3\u679c ans \u4e2d<\/li>\n<hr \/>\n<h2>\u4e09\u3001 \u4ee3\u7801\u5b9e\u73b0\u4e0e\u6df1\u5ea6\u89e3\u6790<\/h2>\n<p>\u3010\u6700\u4f73\u5b9e\u8df5\u3011<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">countKConstraintSubstrings<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> s<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> k<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> ans <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> left <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6ed1\u52a8\u7a97\u53e3\u7684\u5de6\u8fb9\u754c<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ cnt[0] \u8bb0\u5f55 &#039;0&#039; \u7684\u6570\u91cf, cnt[1] \u8bb0\u5f55 &#039;1&#039; \u7684\u6570\u91cf<\/span><br \/>\n        <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> counts <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> <\/p>\n<p>        <span class=\"token comment\">\/\/ right \u662f\u6ed1\u52a8\u7a97\u53e3\u7684\u53f3\u8fb9\u754c<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> right <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> right <span class=\"token operator\">&lt;<\/span> s<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> right<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u6b65\u9aa4 1: \u53f3\u8fb9\u754c\u8fdb\u5165\u7a97\u53e3&#xff0c;\u66f4\u65b0\u72b6\u6001<\/span><br \/>\n            counts<span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>right<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token string\">&#039;0&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u6b65\u9aa4 2: \u68c0\u67e5\u7a97\u53e3\u662f\u5426\u5408\u6cd5\u3002\u5982\u679c\u4e0d\u5408\u6cd5&#xff0c;\u5219\u6536\u7f29\u5de6\u8fb9\u754c<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u53ea\u8981 &#039;0&#039; \u6216 &#039;1&#039; \u7684\u6570\u91cf\u8d85\u8fc7 k&#xff0c;\u7a97\u53e3\u5c31\u4e0d\u5408\u6cd5<\/span><br \/>\n            <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>counts<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&gt;<\/span> k <span class=\"token operator\">||<\/span> counts<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&gt;<\/span> k<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u5c06\u5de6\u8fb9\u754c\u7684\u5b57\u7b26\u79fb\u51fa\u7a97\u53e3<\/span><br \/>\n                counts<span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>left<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token string\">&#039;0&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                left<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6536\u7f29\u7a97\u53e3<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u6b65\u9aa4 3: \u6b64\u65f6\u7684\u7a97\u53e3 [left, right] \u662f\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u7a97\u53e3<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u6240\u6709\u4ee5 right \u7ed3\u5c3e\u7684\u5b50\u6570\u7ec4&#xff0c;\u53ea\u8981\u5176\u5de6\u8fb9\u754c\u4e0d\u5c0f\u4e8e left&#xff0c;\u5c31\u90fd\u662f\u5408\u6cd5\u7684<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8fd9\u6837\u7684\u5b50\u6570\u7ec4\u6709 (right &#8211; left &#043; 1) \u4e2a<\/span><br \/>\n            ans <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token punctuation\">(<\/span>right <span class=\"token operator\">&#8211;<\/span> left <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> ans<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;while\u5faa\u73af\u4e2d\u7684\u6761\u4ef6\u662f \u201c\u6216 ||\u201d&#xff0c;\u4e0d\u8981\u7406\u89e3\u9519\u9898\u610f\u7406\u89e3\u4e3a\u4e86 \u201c\u4e14 &amp;&amp;\u201d&#xff08;\u5c3d\u7ba1\u5199\u6210 &amp;&amp; \u7684\u903b\u8f91\u4e5f\u80fd\u8fc7&#xff09;<\/p>\n<p>\u63d0\u4ea4\u7ed3\u679c&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812135937-689b48c923a6a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<hr \/>\n<h2>\u56db\u3001 \u5173\u952e\u70b9\u4e0e\u590d\u6742\u5ea6\u5206\u6790<\/h2>\n<ul>\n<li>\u8ba1\u6570\u539f\u7406&#xff1a;ans &#043;&#061; (right &#8211; left &#043; 1) 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