{"id":115575,"date":"2026-10-12T17:17:08","date_gmt":"2026-10-12T09:17:08","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/115575.html"},"modified":"2026-10-12T17:17:08","modified_gmt":"2026-10-12T09:17:08","slug":"leetcode%e9%a2%98%e5%ba%93%e7%ac%ac3%e9%a2%98-%e6%97%a0%e9%87%8d%e5%a4%8d%e9%95%bf%e5%ba%a6%e7%9a%84%e6%9c%80%e9%95%bf%e5%ad%90%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/115575.html","title":{"rendered":"Leetcode\u9898\u5e93\u7b2c3\u9898 \u65e0\u91cd\u590d\u957f\u5ea6\u7684\u6700\u957f\u5b50\u4e32"},"content":{"rendered":"

\u9898\u76ee\u6982\u8981：<\/p>\n

\"\"<\/p>\n

\u9898\u76ee\u53d9\u8ff0\u8fd8\u662f\u5f88\u6e05\u695a\u7684，\u8981\u6c42\u6211\u4eec\u627e\u51fa\u5b57\u7b26\u4e32\u4e2d\u7684\u4e00\u4e2a\u5b50\u4e32，\u8fd9\u4e2a\u5b50\u4e32\u7684\u6ca1\u6709\u91cd\u590d\u5b57\u7b26，\u800c\u4e14\u6bd4\u8fd9\u4e2a\u5b50\u4e32\u957f\u5ea6\u8fd8\u957f\u7684\u5b50\u4e32\u5fc5\u5b9a\u6709\u91cd\u590d\u51fa\u73b0\u7684\u5b57\u7b26\u3002<\/p>\n

\u4e00\u5f00\u59cb\u6211\u60f3\u5230\u7684\u662f\u201c\u6ed1\u52a8\u7a97\u53e3\u201d，\u7a97\u53e3\u957f\u5ea6\u4ece2\u5f00\u59cb\u9010\u6b65\u589e\u52a0\u5230\u5b57\u7b26\u4e32\u672c\u8eab\u7684\u957f\u5ea6，\u7a97\u53e3\u4e00\u6b21\u79fb\u52a8\u4e00\u683c，\u5982\u679c\u5f53\u524d\u7a97\u53e3\u6ca1\u6709\u68c0\u6d4b\u5230\u91cd\u590d\u5b57\u7b26，\u8bf4\u660e\u8fd9\u4e2a\u957f\u5ea6\u662f\u53ef\u884c\u7684，\u7a97\u53e3\u957f\u5ea6\u52a01，\u5982\u679c\u68c0\u6d4b\u5230\u91cd\u590d\u5b57\u7b26，\u7a97\u53e3\u79fb\u4e00\u683c\u518d\u68c0\u6d4b，\u4e00\u76f4\u505a\u4e0b\u53bb，\u76f4\u5230\u7a97\u53e3\u957f\u5ea6\u5230\u6700\u5927（\u7b54\u6848\u5c31\u662flen(str)）\u6216\u5f53\u524d\u7a97\u53e3\u5df2\u7ecf\u6ed1\u5230\u672b\u5c3e\u4e86\u8fd8\u662f\u6709\u91cd\u590d\u5b57\u7b26，\u5219\u7b54\u6848\u5c31\u662f\u7a97\u53e3\u957f\u5ea6\u51cf1\u3002\u6211\u4e00\u5f00\u59cb\u60f3\u7684\u53cd\u6389\u4e86\u3002<\/p>\n

\"\"<\/p>\n

\u8fd9\u4e2a\u601d\u8def\u662f\u6b63\u786e\u7684，\u5176\u5b9e\u5c31\u662f\u66b4\u529b\u6cd5，\u4e00\u4e2a\u4e2a\u5b50\u4e32\u90fd\u53bb\u8bd5，\u539f\u59cb\u65b9\u6cd5\u7684\u4ee3\u7801\u662f\u8fd9\u6837\u7684：<\/p>\n

class Solution {
\npublic:
\n int lengthOfLongestSubstring(string s) {<\/p>\n

int n = s.size();
\n if(n <= 1) return n; \/\/\u5b57\u7b26\u4e32\u957f\u5ea6\u4e3a1\u76f4\u63a5\u8fd4\u56de
\n \/\/\u4ece\u7a97\u53e3\u957f\u5ea6\u4e3a2\u5f00\u59cb\u8bd5，\u76f4\u5230\u7a97\u53e3\u957f\u5ea6\u4e3a\u6574\u4e2a\u5b57\u7b26\u4e32\u7684\u957f\u5ea6n
\n for(int len = 2; len <= n; len++){
\n bool found = false;<\/p>\n

\/\/\u6ed1\u52a8\u7a97\u53e3，\u7a97\u53e3\u7684\u8d77\u59cb\u4f4d\u7f6e\u4e3a0，1，2…，\u8d77\u59cb\u4f4d\u7f6e\u6700\u591a\u5230n-1-(len-1)
\n for(int start = 0; start <= n-len; start++){
\n bool hasDup = false; \/\/\u786e\u5b9a\u8be5\u7a97\u53e3\u6709\u65e0\u91cd\u590d\u5b57\u7b26
\n for(int i = start; i < start + len; i++){
\n for(int j = i + 1; j < start + len; j++){
\n if(s[i] == s[j]){
\n hasDup = true;
\n break;
\n }
\n }
\n }
\n \/\/\u53ea\u8981\u5f53\u524d\u7a97\u53e3\u65e0\u91cd\u590d\u5b57\u7b26，\u8bf4\u660e\u8fd9\u4e2a\u957f\u5ea6len\u53ef\u884c
\n if(hasDup == false){
\n found = true;
\n break;
\n }
\n }<\/p>\n

\/\/\u5f53\u524d\u957f\u5ea6\u4e0d\u53ef\u884c，\u7b54\u6848\u5c31\u662f\u4e0a\u4e00\u4e2a\u957f\u5ea6
\n if(found == false){
\n return len – 1;
\n }
\n }
\n return n; \/\/\u5982\u679clen\u90fd\u904d\u5386\u5b8c\u4e86，\u90a3\u7b54\u6848\u5c31\u662f\u6574\u4e2a\u5b57\u7b26\u4e32\u7684\u957f\u5ea6<\/p>\n

}
\n};<\/p>\n

\u539f\u59cb\u65b9\u6cd5\u867d\u7136\u7b80\u5355，\u5199\u8d77\u6765\u548c\u7406\u89e3\u8d77\u6765\u8fd8\u662f\u633a\u8d39\u52b2\u7684，\u8fd9\u6709\u56db\u5c42\u5faa\u73af，\u524d\u4e24\u5c42\u662f\u786e\u5b9a\u7a97\u53e3\u957f\u5ea6\u4ee5\u53ca\u79fb\u52a8\u7a97\u53e3，\u91cc\u9762\u4e24\u5c42\u662f\u7528\u6765\u6bd4\u8f83\u8fd9\u4e2a\u7a97\u53e3\u662f\u5426\u6709\u5b57\u7b26\u91cd\u590d\u3002<\/p>\n

\u4e0d\u51fa\u6211\u6240\u6599，\u4e5f\u4e0d\u51faKimi\u6240\u6599，\u4ee3\u7801\u5728\u8fd0\u884c\u5230\u5012\u6570\u7b2c\u4e8c\u4e2a\u6d4b\u8bd5\u7528\u4f8b\u8d85\u65f6\u4e86<\/p>\n

\"\"<\/p>\n

\u4f18\u5316\u601d\u8def\u4f9d\u65e7\u662f\u7a7a\u95f4\u6362\u65f6\u95f4，\u8fd9\u4e2a\u7a97\u53e3\u4e0d\u5fc5\u8981\u9010\u4e00\u6ed1\u52a8\u5e76\u91cd\u7f6e，\u800c\u662f\u53ef\u4ee5\u201c\u8df3\u53d8\u201d\u7684\u3002Kimi\u53c8\u53d1\u6325\u51fa\u4e86\u5b83\u60ca\u4eba\u7684\u5929\u8d4b\u3002\u56fe\u89e3\u5982\u4e0b：<\/p>\n

\"\"<\/p>\n

R\u7684\u4f4d\u7f6e\u662f\u4e00\u76f4\u9012\u589e\u7684，L\u4e0eR\u4e4b\u95f4\u7a97\u53e3\u4e2d\u7684\u5b57\u7b26\u7528\u4e00\u4e2a\u5b57\u5178\u8bb0\u5f55\u5b83\u6700\u540e\u4e00\u6b21\u5728\u7a97\u53e3\u4e2d\u51fa\u73b0\u7684\u4f4d\u7f6e，\u7531\u4e8eR\u662f\u4ece0\u5f00\u59cb\u79fb\u52a8\u7684，\u6211\u4eec\u5b9e\u65f6\u66f4\u65b0\u5b57\u5178\u5176\u5b9e\u5c31\u662f\u8bb0\u5f55R\u6307\u9488\u6240\u5728\u7684\u5b57\u7b26\u662f\u5426\u9700\u8981\u66f4\u65b0，\u68c0\u6d4b\u7684\u4e5f\u662fR\u4f4d\u7f6e\u6240\u5728\u7684\u5b57\u7b26\u662f\u5426\u51fa\u73b0\u91cd\u590d\u3002<\/p>\n

L\u6307\u9488\u5728\u68c0\u6d4b\u5230\u91cd\u590d\u5b57\u7b26\u65f6\u8981\u4e48\u4e0d\u52a8，\u8981\u4e48\u79fb\u52a8\u5230 \u5b57\u5178\u8bb0\u5f55\u7684 R\u6307\u9488\u6240\u5728\u5b57\u7b26\u00a0\u7684 \u4e0b\u4e00\u4e2a\u4f4d\u7f6e，\u5982\u4f55\u79fb\u52a8\u5c31\u53d6\u8f83\u5927\u8005\u3002\u8fd9\u6837\u505a\u7684\u539f\u56e0\u662f\u5f53\u524d\u7a97\u53e3\u6700\u53f3\u4fa7\u5b57\u7b26\u5982\u679c\u662f\u91cd\u590d\u51fa\u73b0\u7684\u8bdd，\u7a97\u53e3\u7684\u5de6\u8fb9\u754c\u7edd\u4e0d\u53ef\u80fd\u66f4\u9760\u5de6\u3002<\/p>\n

\u4e0b\u9762\u662f\u4ee3\u7801，\u7528\u7684\u662f\u6570\u7ec4\u5f0f\u7684\u4f2a\u54c8\u5e0c\u8868，ASCII\u5b57\u7b26\u6709128\u79cd，\u6570\u7ec4\u7b2c\u4e00\u7ef4\u957f\u5ea6\u4e3a128，\u8fd9\u6837\u505a\u53ef\u4ee5\u5feb\u4e00\u70b9\u3002<\/p>\n

class Solution {
\npublic:
\n int lengthOfLongestSubstring(string s) {<\/p>\n

vector<int> last(128,-1); \/\/\u8bb0\u5f55\u6bcf\u4e00\u79cd\u5b57\u7b26\u6700\u540e\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e，-1\u8868\u793a\u672a\u51fa\u73b0\u8fc7
\n int left = 0;
\n int maxLen = 0;
\n for(int right = 0; right < s.size(); right++){
\n char ch = s[right];
\n \/\/\u5982\u679c\u5b57\u7b26\u51fa\u73b0\u8fc7，\u4e14\u5927\u4e8eleft，left\u8df3\u53d8，\u5408\u8d77\u6765\u5c31\u662f：
\n if(last[ch] >= left){ \/\/\u8fd9\u91cc\u662f\u5927\u4e8e\u7b49\u4e8e
\n left= last[ch] + 1;
\n }
\n last[ch] = right; \/\/\u5b9e\u65f6\u66f4\u65b0last
\n maxLen = max(maxLen, right – left + 1); \/\/\u5b9e\u65f6\u66f4\u65b0maxLen
\n }
\n return maxLen;
\n }
\n};<\/p>\n

\u5f53\u7136，\u9898\u76ee\u4ec5\u9650ASCII\u5b57\u7b26，\u5982\u679c\u6709\u6c49\u5b57\u7b49\u5176\u4ed6\u5b57\u7b26，\u53ef\u4ee5\u5c06128\u6539\u6210Unicode\u768465536，\u6216\u8005\u7528\u771f\u6b63\u7684\u54c8\u5e0c\u8868，\u4ee3\u7801\u505a\u4e86\u4e9b\u6539\u52a8，\u6ce8\u610f\u521d\u59cb\u5316\u548c\u8bbf\u95ee\u65b9\u5f0f\u3002<\/p>\n

class Solution {
\npublic:
\n int lengthOfLongestSubstring(string s) {<\/p>\n

unordered_map <char, int> last;
\n int left = 0;
\n int maxLen = 0;
\n for(int right = 0; right < s.size(); right++){
\n char ch = s[right];
\n int last_ch = last.count(ch) ? last[ch] : -1;
\n \/\/\u5982\u679c\u5b57\u7b26\u51fa\u73b0\u8fc7，\u4e14\u5927\u4e8eleft，left\u8df3\u53d8，\u5408\u8d77\u6765\u5c31\u662f：
\n if(last_ch >= left){ \/\/\u8fd9\u91cc\u662f\u5927\u4e8e\u7b49\u4e8e
\n left= last[ch] + 1;
\n }
\n last[ch] = right; \/\/\u5b9e\u65f6\u66f4\u65b0last
\n maxLen = max(maxLen, right – left + 1); \/\/\u5b9e\u65f6\u66f4\u65b0maxLen
\n }
\n return maxLen;<\/p>\n

}
\n};<\/p>\n","protected":false},"excerpt":{"rendered":"

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