{"id":874,"date":"2025-10-02T18:48:27","date_gmt":"2025-10-02T10:48:27","guid":{"rendered":"https:\/\/www.guanhaobo.cn\/?p=874"},"modified":"2025-10-02T18:52:53","modified_gmt":"2025-10-02T10:52:53","slug":"leetcode-3-%e6%97%a0%e9%87%8d%e5%a4%8d%e5%ad%97%e7%ac%a6%e7%9a%84%e6%9c%80%e9%95%bf%e5%ad%90%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/www.guanhaobo.cn\/?p=874","title":{"rendered":"LeetCode 3 \u2013 \u65e0\u91cd\u590d\u5b57\u7b26\u7684\u6700\u957f\u5b50\u4e32"},"content":{"rendered":"

\u9898\u76ee\u63cf\u8ff0<\/h1>\n

\u7ed9\u5b9a\u4e00\u4e2a\u5b57\u7b26\u4e32 s \uff0c\u8bf7\u4f60\u627e\u51fa\u5176\u4e2d\u4e0d\u542b\u6709\u91cd\u590d\u5b57\u7b26\u7684 \u6700\u957f \u5b50\u4e32 \u7684\u957f\u5ea6\u3002<\/p>\n

\u793a\u4f8b 1:<\/p>\n

\u8f93\u5165: s = “abcabcbb”
\n\u8f93\u51fa: 3
\n\u89e3\u91ca: \u56e0\u4e3a\u65e0\u91cd\u590d\u5b57\u7b26\u7684\u6700\u957f\u5b50\u4e32\u662f “abc”\uff0c\u6240\u4ee5\u5176\u957f\u5ea6\u4e3a 3\u3002
\n\u793a\u4f8b 2:<\/p>\n

\u8f93\u5165: s = “bbbbb”
\n\u8f93\u51fa: 1
\n\u89e3\u91ca: \u56e0\u4e3a\u65e0\u91cd\u590d\u5b57\u7b26\u7684\u6700\u957f\u5b50\u4e32\u662f “b”\uff0c\u6240\u4ee5\u5176\u957f\u5ea6\u4e3a 1\u3002
\n\u793a\u4f8b 3:<\/p>\n

\u8f93\u5165: s = “pwwkew”
\n\u8f93\u51fa: 3
\n\u89e3\u91ca: \u56e0\u4e3a\u65e0\u91cd\u590d\u5b57\u7b26\u7684\u6700\u957f\u5b50\u4e32\u662f “wke”\uff0c\u6240\u4ee5\u5176\u957f\u5ea6\u4e3a 3\u3002
\n \u8bf7\u6ce8\u610f\uff0c\u4f60\u7684\u7b54\u6848\u5fc5\u987b\u662f \u5b50\u4e32 \u7684\u957f\u5ea6\uff0c”pwke” \u662f\u4e00\u4e2a\u5b50\u5e8f\u5217\uff0c\u4e0d\u662f\u5b50\u4e32\u3002<\/p>\n

\u9898\u76ee\u5206\u6790<\/h1>\n

\u76f4\u63a5\u66b4\u529b\u679a\u4e3e\uff0c\u53cc\u5c42\u5faa\u73af\uff0c\u65f6\u95f4\u590d\u6742\u5ea6 O(n^2)<\/code> \uff0c\u663e\u7136\u4e0d\u662f\u597d\u7684\u505a\u6cd5\u3002
\n\u4f7f\u7528\u53cc\u6307\u9488\u7ef4\u62a4\u4e00\u4e2a\u6ed1\u52a8\u7a97\u53e3\uff0c\u7528 HashSet \u6765\u786e\u4fdd\u7a97\u53e3\u5185\u5b57\u7b26\u4e0d\u91cd\u590d\u3002
\n\u5148\u7528\u53f3\u6307\u9488\u5c3d\u53ef\u80fd\u7684\u6dfb\u52a0\u5b57\u7b26\uff0c\u65e0\u6cd5\u6dfb\u52a0\u65f6\uff0c\u5c31\u5c06\u5de6\u6307\u9488\u5411\u53f3\u79fb\u52a8\u4e00\u4f4d\uff08\u540c\u65f6\u5728 set \u4e2d\u5220\u9664\u5bf9\u5e94\u5b57\u7b26\uff09\u3002\u4e0d\u65ad\u5faa\u73af\u76f4\u5230\u5de6\u6307\u9488\u79fb\u52a8\u5230\u6700\u53f3\u8fb9\uff0c\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u8bb0\u5f55\u7a97\u53e3\u7684\u6700\u5927\u957f\u5ea6\u3002
\n\u867d\u7136\u4ee3\u7801\u4e0a\u67092\u5c42\u5faa\u73af\uff0c\u4f46\u4ece\u5168\u5c40\u89c6\u89d2\u5de6\u6307\u9488\u548c\u53f3\u6307\u9488\u90fd\u53ea\u4f1a\u904d\u5386\u4e00\u6b21\u5b57\u7b26\u4e32\uff0c\u56e0\u6b64\u65f6\u95f4\u590d\u6742\u5ea6\u662f O(n)<\/code>\u3002<\/p>\n

Java<\/h1>\n
public int lengthOfLongestSubstring(String s) {\n    int ans = 0;\n    int left = 0, right = 0;\n    HashSet<Character> set = new HashSet<>();\n    while (left < s.length()) {\n        while (right < s.length() && !set.contains(s.charAt(right))) {\n            set.add(s.charAt(right++));\n        }\n        ans = Math.max(ans, right - left);\n        set.remove(s.charAt(left++));\n    }\n    return ans;\n}\n<\/code><\/pre>\n
Kotlin<\/h1>\n
    fun lengthOfLongestSubstring(s: String): Int {\n        var left = 0\n        var right = 0\n        var ans = 0\n        val length = s.length\n        val set = HashSet<Char>()\n        while (left < length) {\n            while (right < length && !set.contains(s[right])) {\n                set.add(s[right++])\n            }\n            ans = ans.coerceAtLeast(right - left)\n            set.remove(s[left++])\n        }\n        return ans\n    }\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u9898\u76ee\u63cf\u8ff0 \u7ed9\u5b9a\u4e00\u4e2a\u5b57\u7b26\u4e32 s \uff0c\u8bf7\u4f60\u627e\u51fa\u5176\u4e2d\u4e0d\u542b\u6709\u91cd\u590d\u5b57\u7b26\u7684 \u6700\u957f \u5b50\u4e32 \u7684\u957f\u5ea6\u3002 \u793a\u4f8b 1: \u8f93\u5165: s = […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[20,75,74,77],"class_list":["post-874","post","type-post","status-publish","format-standard","hentry","category-algo","tag-leetcode","tag-75","tag-74","tag-77"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/874","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=874"}],"version-history":[{"count":4,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/874\/revisions"}],"predecessor-version":[{"id":878,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/874\/revisions\/878"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=874"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=874"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=874"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}