{"id":179,"date":"2022-02-23T18:26:15","date_gmt":"2022-02-23T10:26:15","guid":{"rendered":"http:\/\/nas.hepcloud.top:7000\/?p=179"},"modified":"2022-02-23T18:26:15","modified_gmt":"2022-02-23T10:26:15","slug":"%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":"http:\/\/www.huerpu.cc:7000\/?p=179","title":{"rendered":"3.\u65e0\u91cd\u590d\u5b57\u7b26\u7684\u6700\u957f\u5b50\u4e32"},"content":{"rendered":"\n

\u7ed9\u5b9a\u4e00\u4e2a\u5b57\u7b26\u4e32s<\/code>\uff0c\u8bf7\u4f60\u627e\u51fa\u5176\u4e2d\u4e0d\u542b\u6709\u91cd\u590d\u5b57\u7b26\u7684\u6700\u957f\u5b50\u4e32<\/strong>\u7684\u957f\u5ea6\u3002<\/p>\n\n\n

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

\u8f93\u5165: s = \"abcabcbb\"
\u8f93\u51fa: 3 
\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<\/pre>\n\n\n
\u793a\u4f8b 2:<\/strong><\/p>\n\n\n
\u8f93\u5165: s = \"bbbbb\"
\u8f93\u51fa: 1
\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<\/pre>\n\n\n
\u793a\u4f8b 3:<\/strong><\/p>\n\n\n
\u8f93\u5165: s = \"pwwkew\"
\u8f93\u51fa: 3
\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
     \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<\/pre>\n\n\n
\u63d0\u793a\uff1a<\/strong><\/p>\n\n\n
  • 0 <= s.length <= 5 * 104<\/sup><\/li>
  • s \u7531\u82f1\u6587\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u7b26\u53f7\u548c\u7a7a\u683c\u7ec4\u6210<\/li><\/ul>\n\n\n
    \u5b50\u4e32<\/strong>\u548c\u5b50\u5e8f\u5217<\/strong>\u7684\u533a\u522b\u662f\uff0c\u5b50\u4e32<\/strong>\u4e00\u5b9a\u662f\u8fde\u7eed\u7684\uff0c\u800c\u5b50\u5e8f\u5217<\/strong>\u4e0d\u4e00\u5b9a\u662f\u8fde\u7eed\u7684\u3002\u672c\u9898\u6c42\u6700\u957f\u5b50\u4e32\uff0c\u6240\u6c42\u4e3a\u5b57\u7b26\u4e32\u7684\u8fde\u7eed\u5b50\u4e32\u3002<\/p>\n\n\n
    \u56e0\u4e3a\u5b57\u7b26\u4e32\u662f\u7531\u82f1\u6587\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u7b26\u53f7\u548c\u7a7a\u683c\u7ec4\u6210\uff0c\u6240\u4ee5ASCII\u7801\u8868\u53ef\u4ee5\u8986\u76d6\u3002\u56e0\u6b64\uff0c\u521b\u5efa\u4e00\u4e2a\u4e0eASCII\u7801\u8868\u76f8\u5bf9\u5e94\u7684128\u957f\u5ea6\u7684\u6570\u7ec4\uff0c\u7528\u6765\u8bb0\u5f55\u5b57\u7b26\u4e0a\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff0c\u521d\u59cb\u503c\u90fd\u4e3a-1\u3002\u91c7\u7528\u6ed1\u52a8\u7a97\u53e3\u601d\u60f3\u8fdb\u884c\u89e3\u9898\uff0c\u904d\u5386\u5b57\u7b26\u4e32s\uff0c\u7528int\u63a5\u6536\u5b57\u7b26\u62ff\u5230\u7684\u5c31\u662fASCII\u7801\u503c\uff0cstart\u4e3a\u7a97\u53e3\u7684\u5f00\u59cb\u4f4d\u7f6e\uff0c\u5982\u679c\u7a97\u53e3\u9047\u5230\u4e86\u91cd\u590d\u7684\u5b57\u7b26\uff0cstart\u5c31\u66f4\u65b0\u81f3\u91cd\u590d\u5b57\u7b26\u4e0a\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e+1\uff0c\u4e5f\u5c31\u662f\u9047\u5230\u91cd\u590d\u7684\u5b57\u7b26\u5c31\u6390\u5934\uff0c\u4ece\u540e\u9762\u5f00\u59cb\u8ba1\u7b97\u3002result\u4fdd\u5b58\u6700\u957f\u5b50\u4e32\u7684\u957f\u5ea6\u3002<\/p>\n\n\n
    Java\u4ee3\u7801\u5b9e\u73b0<\/p>\n\n\n
    \/**
     * \u91c7\u7528\u6ed1\u52a8\u7a97\u53e3\u601d\u60f3
     * @param s
     * @return
     *\/
    public int lengthOfLongestSubstring(String s) {
        int n = s.length();
        int[] last = new int[128];\/\/ASCII\u7801\u8303\u56f4\uff1a0-127
        \/\/\u521b\u5efa\u4e00\u4e2a\u4e0eASCII\u7801\u8868\u76f8\u5bf9\u5e94\u7684128\u957f\u5ea6\u7684\u6570\u7ec4\uff0c\u7528\u6765\u8bb0\u5f55\u5b57\u7b26\u4e0a\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff0c\u521d\u59cb\u503c\u90fd\u4e3a-1
        for(int i = 0; i < 128; i++){
            last[i] = -1;
        }
        int result = 0;
        int start = 0;
        for(int i = 0; i < n; i++){
            int index = s.charAt(i);\/\/\u7528int\u63a5\u6536\u5b57\u7b26\u62ff\u5230\u7684\u5c31\u662fASCII\u7801\u503c
            start = Math.max(start, last[index] + 1);\/\/start\u53d6\u4e0a\u4e00\u4e2a\u91cd\u590d\u5b57\u7b26\u7684\u4f4d\u7f6e+1
            result = Math.max(result, i - start + 1);\/\/\u4e4b\u524d\u7684\u6700\u5927\u5b50\u4e32\u957f\u5ea6\u548c\u5f53\u524d\u7684\u6700\u5927\u5b50\u4e32\u957f\u5ea6\u53d6\u6700\u5927\u503c
            last[index] = i;
        }
        return result;
    }<\/pre>\n","protected":false},"excerpt":{"rendered":"
    \u7ed9\u5b9a\u4e00\u4e2a\u5b57\u7b26\u4e32s\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 = “abcabcbb […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-179","post","type-post","status-publish","format-standard","hentry","category-leecode"],"_links":{"self":[{"href":"http:\/\/www.huerpu.cc:7000\/index.php?rest_route=\/wp\/v2\/posts\/179","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.huerpu.cc:7000\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.huerpu.cc:7000\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.huerpu.cc:7000\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.huerpu.cc:7000\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=179"}],"version-history":[{"count":0,"href":"http:\/\/www.huerpu.cc:7000\/index.php?rest_route=\/wp\/v2\/posts\/179\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.huerpu.cc:7000\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=179"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.huerpu.cc:7000\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=179"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.huerpu.cc:7000\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=179"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}