{"id":97754,"date":"2026-08-30T07:24:45","date_gmt":"2026-08-29T23:24:45","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/97754.html"},"modified":"2026-08-30T07:24:45","modified_gmt":"2026-08-29T23:24:45","slug":"%e9%ab%98%e9%a2%91%e5%bf%85%e8%80%83%ef%bc%81%e7%8e%af%e5%bd%a2%e9%93%be%e8%a1%a8%ef%bc%9a%e4%b8%ba%e4%bb%80%e4%b9%88%e5%bf%ab%e6%85%a2%e6%8c%87%e9%92%88%e6%b0%b8%e8%bf%9c%e8%83%bd%e7%9b%b8%e9%81%87","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/97754.html","title":{"rendered":"\u9ad8\u9891\u5fc5\u8003\uff01\u73af\u5f62\u94fe\u8868\uff1a\u4e3a\u4ec0\u4e48\u5feb\u6162\u6307\u9488\u6c38\u8fdc\u80fd\u76f8\u9047\uff1f"},"content":{"rendered":"<p>LeetCode 141\u300c\u73af\u5f62\u94fe\u8868\u300d&#xff0c;Easy \u96be\u5ea6&#xff0c;\u51e0\u4e4e\u4eba\u4eba\u90fd\u4f1a\u5199 while fast and fast.next\u3002<br \/>\n\u4f46\u9762\u8bd5\u5b98\u6839\u672c\u4e0d\u6ee1\u8db3\u4e8e\u6b64&#xff0c;\u771f\u6b63\u7684\u593a\u547d\u4e09\u8fde\u95ee\u662f&#xff1a;<\/p>\n<ul>\n<li>\u300c\u4e3a\u4ec0\u4e48\u6b65\u957f\u9009 2 \u548c 1&#xff1f;\u9009 3 \u548c 1 \u884c\u4e0d\u884c&#xff1f;\u300d<\/li>\n<li>\u300c\u600e\u4e48\u8bc1\u660e\u5b83\u4eec\u4e00\u5b9a\u76f8\u9047&#xff0c;\u800c\u4e0d\u662f\u6c38\u8fdc\u9519\u8fc7&#xff1f;\u300d<\/li>\n<li>\u300c\u5982\u679c\u8ba9\u4f60\u627e\u73af\u7684\u5165\u53e3&#xff0c;\u600e\u4e48\u6539\u4ee3\u7801&#xff1f;\u300d<\/li>\n<\/ul>\n<p>\u5982\u679c\u4f60\u53ea\u4f1a\u80cc\u4ee3\u7801&#xff0c;\u8fd9\u7bc7\u6587\u7ae0\u5c31\u662f\u4e3a\u4f60\u51c6\u5907\u7684\u3002<\/p>\n<p>\u300c\u8fd9\u91cc\u4e0d\u53ea\u6559\u4f60\u600e\u4e48AC&#xff0c;\u66f4\u6559\u4f60\u600e\u4e48\u5728\u9762\u8bd5\u5b98\u9762\u524d\u628aFloyd\u5224\u5708\u7b97\u6cd5\u7684\u6570\u5b66\u539f\u7406\u8bb2\u5f97\u6e05\u6e05\u695a\u695a\u3002\u300d<\/p>\n<hr \/>\n<h3><span class=\"prefix\"><\/span><span class=\"content\">&#x1f4e6; \u9898\u76ee\u901f\u89c8&#xff08;30 \u79d2\u8bfb\u61c2&#xff09;<\/span><span class=\"suffix\"><\/span><\/h3>\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u94fe\u8868\u7684\u5934\u8282\u70b9head&#xff0c;\u5224\u65ad\u94fe\u8868\u4e2d\u662f\u5426\u6709\u73af\u3002<\/p>\n<p>\u300c\u793a\u4f8b&#xff1a;\u300d[3,2,0,-4]&#xff0c;\u5c3e\u90e8\u8fde\u63a5\u5230\u7d22\u5f15 1&#xff08;\u503c\u4e3a 2&#xff09;\u2192 \u8fd4\u56detrue<br \/>\n\u300c\u793a\u4f8b&#xff1a;\u300d[1]&#xff0c;\u5c3e\u90e8\u6307\u5411null \u2192 \u8fd4\u56defalse<\/p>\n<p>\u300c\u8fdb\u9636\u8981\u6c42&#xff1a;\u300d \u7528 \u300cO(1)\u300d \u7a7a\u95f4\u590d\u6742\u5ea6\u89e3\u51b3&#xff08;\u5373\u4e0d\u80fd\u7528\u54c8\u5e0c\u8868\u5b58\u8bbf\u95ee\u8bb0\u5f55&#xff09;\u3002<\/p>\n<hr \/>\n<h3><span class=\"prefix\"><\/span><span class=\"content\">&#x1f9e0; \u6838\u5fc3\u601d\u8def&#xff1a;\u4ece\u201c\u7a7a\u95f4\u6362\u65f6\u95f4\u201d\u5230\u201c\u9f9f\u5154\u8d5b\u8dd1\u201d<\/span><span class=\"suffix\"><\/span><\/h3>\n<h4><span class=\"prefix\"><\/span><span class=\"content\">\u5e38\u89c4\u89e3\u6cd5\u6709\u4ec0\u4e48\u95ee\u9898&#xff1f;<\/span><span class=\"suffix\"><\/span><\/h4>\n<p>visited\u00a0&#061;\u00a0set()<span class=\"hljs-keyword\">while<\/span>\u00a0head:\u00a0\u00a0\u00a0\u00a0<span class=\"hljs-keyword\">if<\/span>\u00a0head\u00a0<span class=\"hljs-keyword\">in<\/span>\u00a0visited:\u00a0<span class=\"hljs-keyword\">return<\/span>\u00a0<span class=\"hljs-literal\">True<\/span>\u00a0\u00a0\u00a0\u00a0visited.add(head)\u00a0\u00a0\u00a0\u00a0head\u00a0&#061;\u00a0head.next<span class=\"hljs-keyword\">return<\/span>\u00a0<span class=\"hljs-literal\">False<\/span><\/p>\n<p>O(n) \u65f6\u95f4&#xff0c;O(n) \u7a7a\u95f4\u3002\u9762\u8bd5\u5b98\u4f1a\u95ee&#xff1a;\u201c\u5982\u679c\u94fe\u8868\u6709 10 \u4e07\u4e2a\u8282\u70b9&#xff0c;\u5185\u5b58\u625b\u4e0d\u4f4f\u600e\u4e48\u529e&#xff1f;\u201d<\/p>\n<h4><span class=\"prefix\"><\/span><span class=\"content\">\u5982\u4f55\u4f18\u5316\u5230 O(1)&#xff1f;\u2014\u2014 \u8ffd\u53ca\u95ee\u9898<\/span><span class=\"suffix\"><\/span><\/h4>\n<p>\u60f3\u8c61\u4e24\u4e2a\u4eba\u56f4\u7740\u73af\u5f62\u8dd1\u9053\u8dd1\u6b65&#xff1a;<\/p>\n<ul>\n<li>\u300c\u4e4c\u9f9f&#xff08;\u6162\u6307\u9488&#xff09;\u300d&#xff1a;\u6bcf\u6b21\u8d70 1 \u6b65<\/li>\n<li>\u300c\u5154\u5b50&#xff08;\u5feb\u6307\u9488&#xff09;\u300d&#xff1a;\u6bcf\u6b21\u8d70 2 \u6b65<\/li>\n<\/ul>\n<p>\u5982\u679c\u8dd1\u9053\u662f\u76f4\u7684&#xff08;\u65e0\u73af&#xff09;&#xff0c;\u5154\u5b50\u5148\u5230\u7ec8\u70b9\u3002<br \/>\n\u5982\u679c\u8dd1\u9053\u662f\u73af\u5f62\u7684&#xff08;\u6709\u73af&#xff09;&#xff0c;\u5154\u5b50\u5728\u76f4\u7ebf\u6bb5\u53ef\u80fd\u9886\u5148&#xff0c;\u4f46\u300c\u4e00\u65e6\u8fdb\u5165\u73af&#xff0c;\u5154\u5b50\u76f8\u5bf9\u4e4c\u9f9f\u7684\u901f\u5ea6\u662f 1 \u6b65\/\u6b21\u300d&#xff0c;\u610f\u5473\u7740\u6bcf\u8dd1\u4e00\u6b21&#xff0c;\u4e24\u8005\u7684\u8ddd\u79bb\u5c31\u7f29\u77ed 1\u3002\u56e0\u4e3a\u73af\u7684\u957f\u5ea6\u662f\u6709\u9650\u7684&#xff0c;\u8ddd\u79bb\u8fdf\u65e9\u4f1a\u7f29\u5230 0\u2014\u2014\u4e5f\u5c31\u662f\u76f8\u9047\u3002<\/p>\n<p>\u300c\u7ed3\u8bba&#xff1a;\u300d \u76f8\u9047 \u21d4 \u6709\u73af\u3002\u65e0\u73af \u21d4 \u5feb\u6307\u9488\u5148\u649e\u5230 null\u3002<\/p>\n<hr \/>\n<h3><span class=\"prefix\"><\/span><span class=\"content\">&#x1f5bc;\ufe0f \u56fe\u89e3\u5168\u8fc7\u7a0b&#xff08;\u624b\u628a\u624b\u8d70\u4e00\u904d&#xff09;<\/span><span class=\"suffix\"><\/span><\/h3>\n<p>\u4ee5\u94fe\u88683 \u2192 2 \u2192 0 \u2192 -4 \u2192 (\u56de\u5230 2) \u4e3a\u4f8b&#xff1a;<\/p>\n<table>\n<tr>\u65f6\u523b\u6162\u6307\u9488 slow \u4f4d\u7f6e\u5feb\u6307\u9488 fast \u4f4d\u7f6e\u76f8\u5bf9\u8ddd\u79bb\u53d8\u5316&#xff08;\u73af\u5185\u89c6\u89d2&#xff09;<\/tr>\n<tbody>\n<tr>\n<td>\u521d\u59cb<\/td>\n<td>3 (\u7d22\u5f150)<\/td>\n<td>3 (\u7d22\u5f150)<\/td>\n<td>\u8ddd\u79bb\u4e3a 0&#xff08;\u540c\u4e00\u8d77\u70b9&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u7b2c 1 \u6b65<\/td>\n<td>2 (\u7d22\u5f151)<\/td>\n<td>0 (\u7d22\u5f152)<\/td>\n<td>\u5feb\u8fdb\u73af&#xff0c;\u6162\u8fd8\u6ca1\u8fdb<\/td>\n<\/tr>\n<tr>\n<td>\u7b2c 2 \u6b65<\/td>\n<td>0 (\u7d22\u5f152)<\/td>\n<td>-4 (\u7d22\u5f153)<\/td>\n<td>\u6162\u8fdb\u73af\u8fb9\u7f18<\/td>\n<\/tr>\n<tr>\n<td>\u7b2c 3 \u6b65<\/td>\n<td>-4 (\u7d22\u5f153)<\/td>\n<td>2 (\u7d22\u5f151)<\/td>\n<td>\u90fd\u5728\u73af\u5185&#xff0c;\u5feb\u5728\u6162\u524d\u9762<\/td>\n<\/tr>\n<tr>\n<td>\u7b2c 4 \u6b65<\/td>\n<td>2 (\u7d22\u5f151)<\/td>\n<td>0 (\u7d22\u5f152)<\/td>\n<td>\u8ddd\u79bb\u7f29\u77ed<\/td>\n<\/tr>\n<tr>\n<td>\u7b2c 5 \u6b65<\/td>\n<td>0 (\u7d22\u5f152)<\/td>\n<td>-4 (\u7d22\u5f153)<\/td>\n<td>\u8ddd\u79bb\u7ee7\u7eed\u7f29\u77ed<\/td>\n<\/tr>\n<tr>\n<td>\u7b2c 6 \u6b65<\/td>\n<td>-4 (\u7d22\u5f153)<\/td>\n<td>2 (\u7d22\u5f151)<\/td>\n<td>\u8ddd\u79bb\u518d\u7f29\u77ed<\/td>\n<\/tr>\n<tr>\n<td>\u7b2c 7 \u6b65<\/td>\n<td>\u300c2 (\u7d22\u5f151)\u300d<\/td>\n<td>\u300c2 (\u7d22\u5f151)\u300d<\/td>\n<td>\u2705 \u300c\u76f8\u9047&#xff01;\u300d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&#x1f9e0; \u300c\u8bb0\u4f4f\u8fd9\u4e2a\u672c\u8d28\u300d&#xff1a;\u8fdb\u5165\u73af\u540e&#xff0c;\u5feb\u6307\u9488\u76f8\u5bf9\u4e8e\u6162\u6307\u9488\u6bcf\u6b21\u53ea\u9760\u8fd1 1 \u6b65\u3002\u5c31\u50cf\u949f\u8868\u4e0a\u7684\u5206\u9488\u8ffd\u65f6\u9488&#xff0c;\u901f\u5ea6\u5dee\u56fa\u5b9a&#xff0c;\u5fc5\u7136\u91cd\u5408\u3002<\/p>\n<hr \/>\n<h3><span class=\"prefix\"><\/span><span class=\"content\">&#x1f4bb; \u4ee3\u7801\u5b9e\u73b0&#xff08;Python &#043; Java&#xff0c;\u9644\u5e26\u7a7a\u6307\u9488\u9632\u5751&#xff09;<\/span><span class=\"suffix\"><\/span><\/h3>\n<h4><span class=\"prefix\"><\/span><span class=\"content\">Python \u7248&#xff08;\u6700\u7b80\u5199\u6cd5&#xff09;<\/span><span class=\"suffix\"><\/span><\/h4>\n<p><span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span>\u00a0<span class=\"hljs-title\">Solution<\/span>:<\/span>\u00a0\u00a0\u00a0\u00a0<span class=\"hljs-function\"><span class=\"hljs-keyword\">def<\/span>\u00a0<span class=\"hljs-title\">hasCycle<\/span><span class=\"hljs-params\">(self,\u00a0head:\u00a0Optional[ListNode])<\/span>\u00a0-&gt;\u00a0bool:<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0slow\u00a0&#061;\u00a0head\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0fast\u00a0&#061;\u00a0head\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"hljs-comment\">#\u00a0\u53ea\u8981\u00a0fast\u00a0\u80fd\u8d70\u4e24\u6b65&#xff0c;\u5c31\u7ee7\u7eed\u8d70<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"hljs-keyword\">while<\/span>\u00a0fast\u00a0<span class=\"hljs-keyword\">and<\/span>\u00a0fast.next:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0slow\u00a0&#061;\u00a0slow.next\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"hljs-comment\">#\u00a0\u6162\u8d70\u00a01<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0fast\u00a0&#061;\u00a0fast.next.next\u00a0\u00a0\u00a0<span class=\"hljs-comment\">#\u00a0\u5feb\u8d70\u00a02<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"hljs-keyword\">if<\/span>\u00a0slow\u00a0&#061;&#061;\u00a0fast:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"hljs-keyword\">return<\/span>\u00a0<span class=\"hljs-literal\">True<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"hljs-keyword\">return<\/span>\u00a0<span class=\"hljs-literal\">False<\/span><\/p>\n<h4><span class=\"prefix\"><\/span><span class=\"content\">Java \u7248<\/span><span class=\"suffix\"><\/span><\/h4>\n<p><span class=\"hljs-keyword\">public<\/span>\u00a0<span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span>\u00a0<span class=\"hljs-title\">Solution<\/span>\u00a0<\/span>{\u00a0\u00a0\u00a0\u00a0<span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span>\u00a0<span class=\"hljs-keyword\">boolean<\/span>\u00a0<span class=\"hljs-title\">hasCycle<\/span><span class=\"hljs-params\">(ListNode\u00a0head)<\/span>\u00a0<\/span>{\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ListNode\u00a0slow\u00a0&#061;\u00a0head;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ListNode\u00a0fast\u00a0&#061;\u00a0head;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"hljs-keyword\">while<\/span>\u00a0(fast\u00a0!&#061;\u00a0<span class=\"hljs-keyword\">null<\/span>\u00a0&amp;&amp;\u00a0fast.next\u00a0!&#061;\u00a0<span class=\"hljs-keyword\">null<\/span>)\u00a0{\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0slow\u00a0&#061;\u00a0slow.next;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0fast\u00a0&#061;\u00a0fast.next.next;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"hljs-keyword\">if<\/span>\u00a0(slow\u00a0&#061;&#061;\u00a0fast)\u00a0<span class=\"hljs-keyword\">return<\/span>\u00a0<span class=\"hljs-keyword\">true<\/span>;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"hljs-keyword\">return<\/span>\u00a0<span class=\"hljs-keyword\">false<\/span>;\u00a0\u00a0\u00a0\u00a0}}<\/p>\n<p>\u26a0\ufe0f \u300c\u81f4\u547d\u5751&#xff08;\u5fc5\u770b&#xff09;\u300d&#xff1a;\u5faa\u73af\u6761\u4ef6\u5fc5\u987b\u5199\u6210 fast and fast.next&#xff08;Python&#xff09;\u6216 fast !&#061; null &amp;&amp; fast.next !&#061; null&#xff08;Java&#xff09;\u3002<\/p>\n<p>\u5982\u679c\u53ea\u5199 fast&#xff0c;\u5f53 fast.next \u4e3a null \u65f6&#xff0c;\u6267\u884c fast.next.next \u4f1a\u76f4\u63a5\u629b\u51fa\u7a7a\u6307\u9488\u5f02\u5e38\u3002<\/p>\n<p>\u300c\u8fd9\u662f\u9762\u8bd5\u624b\u5199\u4ee3\u7801\u65f6\u6700\u5e38\u72af\u7684\u9519\u8bef&#xff0c;\u6ca1\u6709\u4e4b\u4e00\u3002\u300d<\/p>\n<hr \/>\n<h3><span class=\"prefix\"><\/span><span class=\"content\">\u23f1\ufe0f \u590d\u6742\u5ea6\u5206\u6790&#xff08;\u9762\u8bd5\u5fc5\u95ee&#xff09;<\/span><span class=\"suffix\"><\/span><\/h3>\n<ul>\n<li>\u300c\u65f6\u95f4&#xff1a;O(n)\u300d<br \/>\n\u65e0\u73af\u65f6&#xff0c;\u5feb\u6307\u9488\u8d70 n\/2 \u6b65\u5230\u672b\u5c3e&#xff1b;\u6709\u73af\u65f6&#xff0c;\u6162\u6307\u9488\u6700\u591a\u8d70\u5b8c\u73af\u957f &#043; \u73af\u5916\u957f\u5ea6&#xff0c;\u6574\u4f53 O(n)\u3002<\/li>\n<li>\u300c\u7a7a\u95f4&#xff1a;O(1)\u300d<br \/>\n\u53ea\u7528\u4e86\u4e24\u4e2a\u6307\u9488\u53d8\u91cf&#xff0c;\u8fd9\u662fFloyd\u7b97\u6cd5\u78be\u538b\u54c8\u5e0c\u8868\u6cd5\u7684\u6838\u5fc3\u4f18\u52bf\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3><span class=\"prefix\"><\/span><span class=\"content\">&#x1f680; \u4e3e\u4e00\u53cd\u4e09&#xff1a;4 \u9053\u9ad8\u9891\u53d8\u79cd\u9898&#xff0c;\u4e00\u5957\u6846\u67b6\u901a\u5403<\/span><span class=\"suffix\"><\/span><\/h3>\n<table>\n<tr>\u9898\u76ee\u5dee\u5f02\u70b9\u5e94\u5bf9\u7b56\u7565<\/tr>\n<tbody>\n<tr>\n<td>\u300cLeetCode 142. \u73af\u5f62\u94fe\u8868 II\u300d<\/td>\n<td>\u627e\u73af\u7684\u5165\u53e3\u8282\u70b9<\/td>\n<td>\u76f8\u9047\u540e&#xff0c;\u4e00\u4e2a\u6307\u9488\u56de head&#xff0c;\u4e24\u8005\u90fd\u8d70 1 \u6b65&#xff0c;\u518d\u76f8\u9047\u5373\u4e3a\u5165\u53e3<\/td>\n<\/tr>\n<tr>\n<td>\u300cLeetCode 202. \u5feb\u4e50\u6570\u300d<\/td>\n<td>\u6570\u5b57\u5e73\u65b9\u548c\u662f\u5426\u6536\u655b\u5230 1<\/td>\n<td>\u628a\u6bcf\u6b21\u8ba1\u7b97\u770b\u4f5c\u94fe\u8868\u8282\u70b9&#xff0c;\u7528\u5feb\u6162\u6307\u9488\u68c0\u6d4b\u5faa\u73af<\/td>\n<\/tr>\n<tr>\n<td>\u300cLeetCode 876. \u94fe\u8868\u7684\u4e2d\u95f4\u7ed3\u70b9\u300d<\/td>\n<td>\u627e\u4e2d\u70b9<\/td>\n<td>\u5feb\u6307\u9488\u8d70 2 \u6b65&#xff0c;\u6162\u6307\u9488\u8d70 1 \u6b65&#xff0c;\u5feb\u5230\u5c3e\u65f6\u6162\u5728\u4e2d\u70b9<\/td>\n<\/tr>\n<tr>\n<td>\u300cLeetCode 234. \u56de\u6587\u94fe\u8868\u300d<\/td>\n<td>\u5224\u65ad\u662f\u5426\u56de\u6587<\/td>\n<td>\u5feb\u6162\u627e\u4e2d\u70b9 &#043; \u53cd\u8f6c\u540e\u534a\u6bb5&#xff0c;\u518d\u6bd4\u8f83<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3><span class=\"prefix\"><\/span><span class=\"content\">&#x1f4ac; \u9762\u8bd5\u8ffd\u95ee\u6a21\u62df&#xff08;\u63d0\u524d\u51c6\u5907&#xff0c;\u60ca\u8273\u5168\u573a&#xff09;<\/span><span class=\"suffix\"><\/span><\/h3>\n<p>\u300cQ1&#xff1a;\u4e3a\u4ec0\u4e48\u5feb\u6307\u9488\u6bcf\u6b21\u8d70 2 \u6b65&#xff0c;\u6162\u6307\u9488\u8d70 1 \u6b65&#xff1f;\u8d70 3 \u6b65\u884c\u4e0d\u884c&#xff1f;\u300d<\/p>\n<p>\u8d703\u6b65\u5b58\u5728\u201c\u8de8\u8fc7\u201d\u6162\u6307\u9488\u7684\u98ce\u9669\u3002\u56e0\u4e3a\u5feb\u6162\u76f8\u5bf9\u901f\u5ea6 &#061; 2&#xff0c;\u5982\u679c\u73af\u957f\u4e3a\u5076\u6570\u4e14\u521d\u59cb\u8ddd\u79bb\u4e3a\u5947\u6570&#xff0c;\u5feb\u6307\u9488\u4f1a\u6c38\u8fdc\u8df3\u8fc7\u6162\u6307\u9488&#xff0c;\u5bfc\u81f4\u6b7b\u5faa\u73af&#xff08;\u6216\u6781\u665a\u624d\u76f8\u9047&#xff09;\u3002<\/p>\n<p>\u300c\u800c\u6b65\u957f2\u548c1\u7684\u76f8\u5bf9\u901f\u5ea6 &#061; 1\u300d&#xff0c;\u6bcf\u8f6e\u8ddd\u79bb\u51cf 1&#xff0c;\u5fc5\u7136\u7ecf\u5386\u8ddd\u79bb &#061; 0\u7684\u77ac\u95f4&#xff0c;\u6570\u5b66\u4e0a\u4fdd\u8bc1\u76f8\u9047\u3002<\/p>\n<p>\u300cQ2&#xff1a;\u76f8\u9047\u540e&#xff0c;\u5982\u4f55\u627e\u5230\u73af\u7684\u5165\u53e3&#xff1f;&#xff08;LC 142 \u6838\u5fc3&#xff09;\u300d<\/p>\n<p>\u8fd9\u662f Floyd \u7b97\u6cd5\u7684\u7b2c\u4e8c\u9636\u6bb5&#xff1a;<\/p>\n<li>\u7b2c\u4e00\u6b21\u76f8\u9047\u65f6&#xff0c;\u4ee4 ptr &#061; head&#xff1b;<\/li>\n<li>ptr \u548c slow \u6bcf\u6b21\u90fd\u8d70 1 \u6b65&#xff1b;<\/li>\n<li>\u4e24\u8005\u518d\u6b21\u76f8\u9047\u7684\u8282\u70b9\u5c31\u662f\u300c\u73af\u7684\u5165\u53e3\u300d\u3002<br \/>\n\u6570\u5b66\u4f9d\u636e&#xff1a;\u8bbe\u73af\u5916\u957f\u5ea6 a&#xff0c;\u76f8\u9047\u70b9\u8ddd\u5165\u53e3 c&#xff0c;\u73af\u957f b&#xff0c;\u5219 a \u2261 (b &#8211; c) (mod b)&#xff0c;\u540c\u901f\u8d70 a \u6b65\u540e\u5fc5\u5728\u5165\u53e3\u76f8\u9047\u3002<\/li>\n<p>\u300cQ3&#xff1a;\u5982\u679c\u94fe\u8868\u5f88\u957f&#xff08;\u6bd4\u5982 10^6 \u8282\u70b9&#xff09;&#xff0c;\u5feb\u6162\u6307\u9488\u4f1a\u4e0d\u4f1a\u56e0\u4e3a\u9891\u7e41\u8df3\u8f6c\u800c\u6027\u80fd\u53d8\u5dee&#xff1f;\u300d<\/p>\n<p>\u4e0d\u4f1a\u3002\u65f6\u95f4\u590d\u6742\u5ea6\u4f9d\u7136\u662f\u4e25\u683c O(n)&#xff0c;\u4e14\u56e0\u4e3a\u7a7a\u95f4 O(1)&#xff0c;\u5728\u5927\u6570\u636e\u91cf\u4e0b\u53cd\u800c\u6bd4\u54c8\u5e0c\u8868\u6cd5\u66f4\u4f18&#xff08;\u54c8\u5e0c\u8868\u5728\u78b0\u649e\u65f6\u6027\u80fd\u9000\u5316&#xff0c;\u4e14\u5360\u7528\u5927\u91cf\u5185\u5b58&#xff09;\u3002<\/p>\n<hr \/>\n<h3><span class=\"prefix\"><\/span><span class=\"content\">&#x1f9e9; \u5b9e\u6218\u5c0f\u6280\u5de7&#xff08;\u5237\u9898\u515a\u5fc5\u5907&#xff09;<\/span><span class=\"suffix\"><\/span><\/h3>\n<ul>\n<li>\u300c\u53e3\u8bc0\u300d&#xff1a;\u5feb\u4e8c\u6162\u4e00&#xff0c;\u6709\u73af\u5fc5\u9047&#xff1b;\u5feb\u7a7a\u65e0\u73af&#xff0c;\u6162\u4e2d\u6c42\u5076\u3002<\/li>\n<li>\u300c\u6a21\u677f\u300d&#xff1a;\u51e1\u662f\u94fe\u8868\u4e2d\u6709\u201c\u5faa\u73af\/\u91cd\u590d\/\u5468\u671f\u6027\u201d\u7279\u5f81&#xff0c;\u4f18\u5148\u8003\u8651\u5feb\u6162\u6307\u9488\u3002<\/li>\n<li>\u300c\u8fb9\u754c\u300d&#xff1a;\u7a7a\u94fe\u8868&#xff08;head&#061;None&#xff09;\u76f4\u63a5\u8fd4\u56de False&#xff1b;\u5355\u8282\u70b9\u65e0\u73af\u4e5f False\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3><span class=\"prefix\"><\/span><span class=\"content\">&#x1f4c8; \u5b9e\u9645\u5e94\u7528\u573a\u666f&#xff08;\u4e0d\u6b62\u662f\u5237\u9898&#xff09;<\/span><span class=\"suffix\"><\/span><\/h3>\n<ul>\n<li>\u300c\u64cd\u4f5c\u7cfb\u7edf\u6b7b\u9501\u68c0\u6d4b\u300d&#xff1a;\u8d44\u6e90\u5206\u914d\u56fe\u4e2d\u68c0\u6d4b\u5faa\u73af\u7b49\u5f85\u3002<\/li>\n<li>\u300cDNS \u89e3\u6790\u5668\u300d&#xff1a;\u68c0\u6d4b\u57df\u540d CNAME \u8bb0\u5f55\u662f\u5426\u5b58\u5728\u65e0\u9650\u91cd\u5b9a\u5411\u73af\u3002<\/li>\n<li>\u300c\u5305\u7ba1\u7406\u4f9d\u8d56\u89e3\u6790\u300d&#xff1a;\u68c0\u6d4b Maven\/npm \u4f9d\u8d56\u56fe\u4e2d\u662f\u5426\u5b58\u5728\u5faa\u73af\u4f9d\u8d56\u3002<\/li>\n<li>\u300c\u4f2a\u968f\u673a\u6570\u53d1\u751f\u5668\u300d&#xff1a;\u68c0\u6d4b\u968f\u673a\u5e8f\u5217\u662f\u5426\u8fdb\u5165\u77ed\u5468\u671f&#xff08;Floyd \u7b97\u6cd5\u7684\u539f\u59cb\u5e94\u7528&#xff09;\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3><span class=\"prefix\"><\/span><span class=\"content\">&#x1f381; \u4eca\u65e5\u601d\u8003\u9898&#xff08;\u8bc4\u8bba\u533a\u89c1&#xff09;<\/span><span class=\"suffix\"><\/span><\/h3>\n<p>\u5047\u8bbe\u6211\u4eec\u627e\u5230\u73af\u7684\u5165\u53e3\u540e&#xff0c;\u60f3\u8ba1\u7b97\u300c\u73af\u7684\u957f\u5ea6\u300d&#xff0c;\u5e94\u8be5\u600e\u4e48\u505a&#xff1f;<br \/>\n\u300c\u63d0\u793a\u300d&#xff1a;\u5728\u7b2c\u4e00\u6b21\u76f8\u9047\u70b9\u51bb\u7ed3\u4e00\u4e2a\u6307\u9488&#xff0c;\u53e6\u4e00\u4e2a\u6307\u9488\u7ee7\u7eed\u8d70\u5e76\u8ba1\u6570&#xff0c;\u76f4\u5230\u518d\u6b21\u76f8\u9047\u3002<br \/>\n\u4f60\u80fd\u7528 O(1) \u7a7a\u95f4\u5199\u51fa\u4f2a\u4ee3\u7801\u5417&#xff1f;\u6b22\u8fce\u8bc4\u8bba\u533a\u8d34\u51fa\u4f60\u7684\u601d\u8def &#x1f9e0;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>LeetCode 141\u300c\u73af\u5f62\u94fe\u8868\u300d&#xff0c;Easy \u96be\u5ea6&#xff0c;\u51e0\u4e4e\u4eba\u4eba\u90fd\u4f1a\u5199 while fast and fast.next\u3002<br \/>\n\u4f46\u9762\u8bd5\u5b98\u6839\u672c\u4e0d\u6ee1\u8db3\u4e8e\u6b64&#xff0c;\u771f\u6b63\u7684\u593a\u547d\u4e09\u8fde\u95ee\u662f&#xff1a;<br \/>\n\u300c\u4e3a\u4ec0\u4e48\u6b65\u957f\u9009 2 \u548c 1&#xff1f;\u9009 3 \u548c 1 \u884c\u4e0d\u884c&#xff1f;\u300d\u300c\u600e\u4e48\u8bc1\u660e\u5b83\u4eec\u4e00\u5b9a\u76f8\u9047&#xff0c;\u800c\u4e0d\u662f\u6c38\u8fdc\u9519\u8fc7&#xff1f;\u300d\u300c\u5982\u679c\u8ba9\u4f60\u627e\u73af\u7684\u5165\u53e3&#xff0c;\u600e\u4e48\u6539\u4ee3\u7801&#xff1f;\u300d<br \/>\n\u5982\u679c\u4f60\u53ea\u4f1a\u80cc\u4ee3\u7801&#xff0c;\u8fd9\u7bc7\u6587<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1813,2640],"topic":[],"class_list":["post-97754","post","type-post","status-publish","format-standard","hentry","category-server","tag-1813","tag-2640"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u9ad8\u9891\u5fc5\u8003\uff01\u73af\u5f62\u94fe\u8868\uff1a\u4e3a\u4ec0\u4e48\u5feb\u6162\u6307\u9488\u6c38\u8fdc\u80fd\u76f8\u9047\uff1f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/97754.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u9ad8\u9891\u5fc5\u8003\uff01\u73af\u5f62\u94fe\u8868\uff1a\u4e3a\u4ec0\u4e48\u5feb\u6162\u6307\u9488\u6c38\u8fdc\u80fd\u76f8\u9047\uff1f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"LeetCode 141\u300c\u73af\u5f62\u94fe\u8868\u300d&#xff0c;Easy \u96be\u5ea6&#xff0c;\u51e0\u4e4e\u4eba\u4eba\u90fd\u4f1a\u5199 while fast and 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