{"id":145,"date":"2025-08-25T10:28:12","date_gmt":"2025-08-25T02:28:12","guid":{"rendered":"https:\/\/heyingnian.com\/?p=145"},"modified":"2025-08-26T15:42:22","modified_gmt":"2025-08-26T07:42:22","slug":"leetcode-438","status":"publish","type":"post","link":"https:\/\/heyingnian.com\/index.php\/2025\/08\/25\/leetcode-438\/","title":{"rendered":"\u627e\u5230\u5b57\u7b26\u4e32\u4e2d\u6240\u6709\u5b57\u6bcd\u5f02\u4f4d\u8bcd"},"content":{"rendered":"\n<p>\ud83d\udd17 \u627e\u5230\u5b57\u7b26\u4e32\u4e2d\u6240\u6709\u5b57\u6bcd\u5f02\u4f4d\u8bcd<\/p>\n\n\n\n<p>\u9898\u76ee\u6765\u6e90\uff1a<a target=\"_blank\" rel=\"noreferrer noopener\"><a href=\"https:\/\/leetcode.cn\/problems\/find-all-anagrams-in-a-string\/description\/?envType=study-plan-v2&amp;envId=top-100-liked\" target=\"_blank\" rel=\"noopener\">438. \u627e\u5230\u5b57\u7b26\u4e32\u4e2d\u6240\u6709\u5b57\u6bcd\u5f02\u4f4d\u8bcd &#8211; \u529b\u6263\uff08LeetCode\uff09<\/a><\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83d\udccc \u9898\u76ee\u63cf\u8ff0<\/p>\n\n\n\n<p>\u7ed9\u5b9a\u4e24\u4e2a\u5b57\u7b26\u4e32 <code>s<\/code> \u548c <code>p<\/code>\uff0c\u627e\u5230 <code>s<\/code> \u4e2d\u6240\u6709 <code>p<\/code> \u7684 \n<span class=\"tooltip-wrapper\">\n    <strong>\u5f02\u4f4d\u8bcd<\/strong>\n    <span class=\"tooltip-text\">\u5b57\u6bcd\u5f02\u4f4d\u8bcd\u662f\u901a\u8fc7\u91cd\u65b0\u6392\u5217\u4e0d\u540c\u5355\u8bcd\u6216\u77ed\u8bed\u7684\u5b57\u6bcd\u800c\u5f62\u6210\u7684\u5355\u8bcd\u6216\u77ed\u8bed\uff0c\u5e76\u4f7f\u7528\u6240\u6709\u539f\u5b57\u6bcd\u4e00\u6b21\u3002<\/span>\n<\/span> \u7684\u5b50\u4e32\uff0c\u8fd4\u56de\u8fd9\u4e9b\u5b50\u4e32\u7684<strong>\u8d77\u59cb\u7d22\u5f15<\/strong>\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5f02\u4f4d\u8bcd<\/strong>&nbsp;\u6307\u7531\u76f8\u540c\u5b57\u6bcd\u91cd\u6392\u5217\u5f62\u6210\u7684\u5b57\u7b26\u4e32\uff08\u5305\u62ec\u76f8\u540c\u7684\u957f\u5ea6\uff09\u3002<\/li>\n\n\n\n<li>\u4e0d\u8003\u8651\u7b54\u6848\u8f93\u51fa\u7684\u987a\u5e8f\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u2705 \u793a\u4f8b\u89e3\u6790<\/p>\n\n\n\n<p>\u793a\u4f8b 1\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8f93\u5165\uff1a<code>s = \"cbaebabacd\"<\/code>,&nbsp;<code>p = \"abc\"<\/code><\/li>\n\n\n\n<li>\u8f93\u51fa\uff1a<code>[0, 6]<\/code><\/li>\n\n\n\n<li>\u89e3\u91ca\uff1a\n<ul class=\"wp-block-list\">\n<li>\u8d77\u59cb\u7d22\u5f15\u4e3a&nbsp;<code>0<\/code>&nbsp;\u7684\u5b50\u4e32\u662f&nbsp;<code>\"cba\"<\/code>\uff0c\u5b83\u662f&nbsp;<code>\"abc\"<\/code>&nbsp;\u7684\u5f02\u4f4d\u8bcd\u3002<\/li>\n\n\n\n<li>\u8d77\u59cb\u7d22\u5f15\u4e3a&nbsp;<code>6<\/code>&nbsp;\u7684\u5b50\u4e32\u662f&nbsp;<code>\"bac\"<\/code>\uff0c\u5b83\u4e5f\u662f&nbsp;<code>\"abc\"<\/code>&nbsp;\u7684\u5f02\u4f4d\u8bcd\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>\u793a\u4f8b 2\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8f93\u5165\uff1a<code>s = \"abab\"<\/code>,&nbsp;<code>p = \"ab\"<\/code><\/li>\n\n\n\n<li>\u8f93\u51fa\uff1a<code>[0, 1, 2]<\/code><\/li>\n\n\n\n<li>\u89e3\u91ca\uff1a\n<ul class=\"wp-block-list\">\n<li><code>\"ab\"<\/code>\uff08\u7d22\u5f15 0\uff09\u3001<code>\"ba\"<\/code>\uff08\u7d22\u5f15 1\uff09\u3001<code>\"ab\"<\/code>\uff08\u7d22\u5f15 2\uff09\u5747\u4e3a&nbsp;<code>\"ab\"<\/code>&nbsp;\u7684\u5f02\u4f4d\u8bcd\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>\u793a\u4f8b 3\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8f93\u5165\uff1a<code>s = \"a\"<\/code>,&nbsp;<code>p = \"aa\"<\/code><\/li>\n\n\n\n<li>\u8f93\u51fa\uff1a<code>[]<\/code><\/li>\n\n\n\n<li>\u89e3\u91ca\uff1a<code>s<\/code>&nbsp;\u957f\u5ea6\u5c0f\u4e8e&nbsp;<code>p<\/code>\uff0c\u65e0\u6cd5\u6784\u6210\u5f02\u4f4d\u8bcd\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u26a0\ufe0f \u63d0\u793a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>1 &lt;= s.length, p.length &lt;= 3 \u00d7 10\u2074<\/code><\/li>\n\n\n\n<li><code>s<\/code>&nbsp;\u548c&nbsp;<code>p<\/code>&nbsp;\u4ec5\u5305\u542b\u5c0f\u5199\u5b57\u6bcd<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83d\udca1 \u89e3\u6cd5\uff1a\u6ed1\u52a8\u7a97\u53e3 + \u5b57\u7b26\u9891\u6b21\u7edf\u8ba1\uff08\u6570\u7ec4\u6a21\u62df\u54c8\u5e0c\u8868\uff09\u2014\u2014 O(n) \u65f6\u95f4<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\n    public List&lt;Integer&gt; findAnagrams(String s, String p) {\n        char&#91;] scArr = s.toCharArray();\n        char&#91;] pcArr = p.toCharArray();\n\n        if (scArr.length &lt; pcArr.length) {\n            return new ArrayList&lt;&gt;();\n        }\n\n        List&lt;Integer&gt; list = new ArrayList&lt;&gt;();\n        int&#91;] sCount = new int&#91;26]; \n        int&#91;] pCount = new int&#91;26]; \n\n        for (int i = 0; i &lt; pcArr.length; i++) {\n            sCount&#91;scArr&#91;i] - 'a']++;\n            pCount&#91;pcArr&#91;i] - 'a']++;\n        }\n\n        if (Arrays.equals(sCount, pCount)) {\n            list.add(0);\n        }\n\n        for (int i = 0; i &lt; scArr.length - pcArr.length; i++) {\n            sCount&#91;scArr&#91;i] - 'a']--;\n            sCount&#91;scArr&#91;i + pcArr.length] - 'a']++;\n\n            if (Arrays.equals(sCount, pCount)) {\n                list.add(i + 1); \n            }\n        }\n\n        return list;\n    }\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83d\udcca \u590d\u6742\u5ea6\u5206\u6790<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n)<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u904d\u5386\u5b57\u7b26\u4e32&nbsp;<code>s<\/code>&nbsp;\u4e00\u6b21\uff0c\u6bcf\u4e2a\u5b57\u7b26\u6700\u591a\u88ab\u8bbf\u95ee\u4e24\u6b21\uff08\u521d\u59cb\u5316 + \u6ed1\u52a8\uff09\u3002<\/li>\n\n\n\n<li><code>Arrays.equals()<\/code>&nbsp;\u6bd4\u8f83\u4e24\u4e2a\u957f\u5ea6\u4e3a 26 \u7684\u6570\u7ec4\uff0c\u89c6\u4e3a O(1) \u64cd\u4f5c\u3002<\/li>\n\n\n\n<li>\u603b\u4f53\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a\u7ebf\u6027\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(1)<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u4e24\u4e2a\u56fa\u5b9a\u957f\u5ea6\u4e3a 26 \u7684\u6570\u7ec4\uff0c\u7a7a\u95f4\u4e0d\u968f\u8f93\u5165\u89c4\u6a21\u589e\u957f\u3002<\/li>\n\n\n\n<li>\u8fd4\u56de\u7ed3\u679c\u6240\u7528\u7a7a\u95f4\u4e0d\u8ba1\u5165\u989d\u5916\u7a7a\u95f4\u590d\u6742\u5ea6\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83e\udde9 \u89e3\u9898\u601d\u8def<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6838\u5fc3\u601d\u60f3\uff1a\u6ed1\u52a8\u7a97\u53e3 + \u5b57\u7b26\u9891\u6b21\u5339\u914d<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5f02\u4f4d\u8bcd\u7684\u672c\u8d28\u662f\uff1a\u4e24\u4e2a\u5b57\u7b26\u4e32\u4e2d\u6bcf\u4e2a\u5b57\u7b26\u7684\u51fa\u73b0\u6b21\u6570\u5b8c\u5168\u76f8\u540c\u3002<\/li>\n\n\n\n<li>\u56e0\u6b64\uff0c\u6211\u4eec\u53ea\u9700\u5728&nbsp;<code>s<\/code>&nbsp;\u4e0a\u7ef4\u62a4\u4e00\u4e2a\u957f\u5ea6\u4e3a&nbsp;<code>len(p)<\/code>&nbsp;\u7684\u6ed1\u52a8\u7a97\u53e3\uff0c\u5224\u65ad\u5176\u5b57\u7b26\u9891\u6b21\u662f\u5426\u4e0e&nbsp;<code>p<\/code>&nbsp;\u5b8c\u5168\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u521d\u59cb\u5316\u7a97\u53e3<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u5148\u7edf\u8ba1&nbsp;<code>p<\/code>&nbsp;\u4e2d\u6240\u6709\u5b57\u7b26\u7684\u9891\u6b21\uff08<code>pCount<\/code>\uff09\u3002<\/li>\n\n\n\n<li>\u540c\u65f6\u7edf\u8ba1&nbsp;<code>s<\/code>&nbsp;\u7684\u524d&nbsp;<code>p.length()<\/code>&nbsp;\u4e2a\u5b57\u7b26\u9891\u6b21\uff08<code>sCount<\/code>\uff09\u3002<\/li>\n\n\n\n<li>\u6bd4\u8f83\u4e24\u4e2a\u6570\u7ec4\u662f\u5426\u76f8\u7b49\uff0c\u82e5\u76f8\u7b49\u5219\u7d22\u5f15&nbsp;<code>0<\/code>&nbsp;\u662f\u4e00\u4e2a\u7b54\u6848\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u6ed1\u52a8\u7a97\u53e3\u79fb\u52a8<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u6bcf\u6b21\u5c06\u7a97\u53e3\u53f3\u79fb\u4e00\u4f4d\uff1a\n<ul class=\"wp-block-list\">\n<li>\u51cf\u53bb\u5de6\u8fb9\u88ab\u79fb\u51fa\u5b57\u7b26\u7684\u8ba1\u6570\uff08<code>sCount[left]--<\/code>\uff09<\/li>\n\n\n\n<li>\u52a0\u4e0a\u53f3\u8fb9\u65b0\u8fdb\u5165\u5b57\u7b26\u7684\u8ba1\u6570\uff08<code>sCount[right]++<\/code>\uff09<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u518d\u6b21\u6bd4\u8f83&nbsp;<code>sCount<\/code>&nbsp;\u548c&nbsp;<code>pCount<\/code>\uff0c\u82e5\u76f8\u7b49\u5219\u8bb0\u5f55\u5f53\u524d\u7a97\u53e3\u8d77\u59cb\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4e3a\u4ec0\u4e48\u7528\u6570\u7ec4\u800c\u4e0d\u7528 HashMap\uff1f<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5b57\u7b26\u96c6\u4ec5\u4e3a\u5c0f\u5199\u5b57\u6bcd\uff0826 \u4e2a\uff09\uff0c\u4f7f\u7528&nbsp;<code>int[26]<\/code>&nbsp;\u66f4\u9ad8\u6548\uff0c\u907f\u514d\u54c8\u5e0c\u5f00\u9500\u3002<\/li>\n\n\n\n<li>\u6570\u7ec4\u7d22\u5f15\u76f4\u63a5\u901a\u8fc7&nbsp;<code>c - 'a'<\/code>&nbsp;\u8ba1\u7b97\uff0c\u901f\u5ea6\u66f4\u5feb\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u8fb9\u754c\u5904\u7406<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u82e5&nbsp;<code>s.length &lt; p.length<\/code>\uff0c\u76f4\u63a5\u8fd4\u56de\u7a7a\u5217\u8868\u3002<\/li>\n\n\n\n<li>\u5faa\u73af\u6761\u4ef6\uff1a<code>i &lt; s.length - p.length<\/code>\uff0c\u786e\u4fdd\u4e0d\u8d8a\u754c\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udd17 \u627e\u5230\u5b57\u7b26\u4e32\u4e2d\u6240\u6709\u5b57\u6bcd\u5f02\u4f4d\u8bcd \u9898\u76ee\u6765\u6e90\uff1a438. \u627e\u5230\u5b57\u7b26\u4e32\u4e2d\u6240\u6709\u5b57\u6bcd\u5f02\u4f4d\u8bcd &#8211; \u529b\u6263\uff08Leet [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29,12],"tags":[15,24,14],"class_list":["post-145","post","type-post","status-publish","format-standard","hentry","category-sliding_window","category-algorithm","tag-hash","tag-sliding_window","tag-algorithm"],"_links":{"self":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/145","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/comments?post=145"}],"version-history":[{"count":3,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/145\/revisions"}],"predecessor-version":[{"id":148,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/145\/revisions\/148"}],"wp:attachment":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/media?parent=145"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/categories?post=145"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/tags?post=145"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}