{"id":103540,"date":"2026-09-10T21:09:07","date_gmt":"2026-09-10T13:09:07","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/103540.html"},"modified":"2026-09-10T21:09:07","modified_gmt":"2026-09-10T13:09:07","slug":"day3%ef%bc%9aleetcode-104-%e4%ba%8c%e5%8f%89%e6%a0%91%e7%9a%84%e6%9c%80%e5%a4%a7%e6%b7%b1%e5%ba%a6%ef%bc%88%e5%8f%a6%e4%b8%80%e4%b8%aa%e6%96%b9%e6%b3%95%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/103540.html","title":{"rendered":"DAY3\uff1aLeetCode 104. \u4e8c\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6\uff08\u53e6\u4e00\u4e2a\u65b9\u6cd5\uff09"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>LeetCode 104. \u4e8c\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6 \u2014\u2014 BFS \/ \u961f\u5217\u89e3\u6cd5<\/li>\n<li>\u524d\u7f6e\u77e5\u8bc6&#xff1a;\u961f\u5217<\/li>\n<li>\n<ul>\n<li>\u5e38\u7528\u64cd\u4f5c<\/li>\n<li>\n<ul>\n<li>1. \u521b\u5efa\u961f\u5217<\/li>\n<li>2. \u4ece\u961f\u5c3e\u52a0\u5165\u5143\u7d20<\/li>\n<li>3. \u4ece\u961f\u9996\u53d6\u51fa\u5143\u7d20<\/li>\n<li>4. \u67e5\u770b\u5f53\u524d\u961f\u5217\u957f\u5ea6<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4e3a\u4ec0\u4e48\u961f\u5217\u53ef\u4ee5\u89e3\u51b3\u6700\u5927\u6df1\u5ea6&#xff1f;<\/li>\n<li>\u6574\u4f53\u6d41\u7a0b<\/li>\n<li>\n<ul>\n<li>\u7b2c\u4e00\u8f6e<\/li>\n<li>\u7b2c\u4e8c\u8f6e<\/li>\n<li>\u7b2c\u4e09\u8f6e<\/li>\n<\/ul>\n<\/li>\n<li>\u4e3a\u4ec0\u4e48\u8981\u5148\u8bb0\u5f55 level_size&#xff1f;<\/li>\n<li>\u6700\u7ec8\u4ee3\u7801<\/li>\n<li>\u8fd9\u9053\u9898\u6700\u6838\u5fc3\u7684\u601d\u8def<\/li>\n<li>DFS \u548c BFS \u7684\u533a\u522b<\/li>\n<li>\u590d\u6742\u5ea6\u5206\u6790<\/li>\n<\/ul>\n<h2>LeetCode 104. \u4e8c\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6 \u2014\u2014 BFS \/ \u961f\u5217\u89e3\u6cd5<\/h2>\n<p>\u4e0a\u4e00\u7bc7\u5df2\u7ecf\u7528 DFS &#043; \u9012\u5f52\u89e3\u51b3\u4e86\u8fd9\u9053\u9898\u3002<\/p>\n<p>\u4e8c\u53c9\u6811\u57fa\u7840\u3001TreeNode\u3001root \u7684\u7406\u89e3&#xff0c;\u4ee5\u53ca DFS \u9012\u5f52\u601d\u8def&#xff0c;\u53ef\u4ee5\u770b\u4e0a\u4e00\u7bc7&#xff1a; \u4e0a\u4e00\u4e2a\u89e3\u51b3\u65b9\u6cd5<\/p>\n<p>\u8fd9\u4e00\u7bc7\u6362\u4e00\u79cd\u65b9\u6cd5&#xff1a;BFS &#043; \u961f\u5217\u3002\u4f1a\u597d\u7406\u89e3\u70b9\u3002<\/p>\n<hr \/>\n<h2>\u524d\u7f6e\u77e5\u8bc6&#xff1a;\u961f\u5217<\/h2>\n<p>\u961f\u5217\u6700\u91cd\u8981\u7684\u7279\u70b9\u662f&#xff1a;<\/p>\n<p>\u5148\u8fdb\u5148\u51fa&#xff08;FIFO&#xff0c;First In First Out&#xff09;<\/p>\n<p>\u53ef\u4ee5\u7406\u89e3\u6210\u6392\u961f&#xff1a;<\/p>\n<p>\u5148\u8fdb\u5165\u961f\u5217\u7684\u5143\u7d20<br \/>\n\u2193<br \/>\n\u5148\u88ab\u53d6\u51fa\u6765<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>\u8fdb\u5165\u987a\u5e8f&#xff1a;<br \/>\n1 -&gt; 2 -&gt; 3<\/p>\n<p>\u53d6\u51fa\u987a\u5e8f&#xff1a;<br \/>\n1 -&gt; 2 -&gt; 3<\/p>\n<p>Python \u4e2d\u53ef\u4ee5\u4f7f\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">from<\/span> collections <span class=\"token keyword\">import<\/span> deque<\/p>\n<p>\u521b\u5efa\u961f\u5217&#xff1a;<\/p>\n<p>q <span class=\"token operator\">&#061;<\/span> deque<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<h3>\u5e38\u7528\u64cd\u4f5c<\/h3>\n<h4>1. \u521b\u5efa\u961f\u5217<\/h4>\n<p>q <span class=\"token operator\">&#061;<\/span> deque<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5982\u679c\u4e00\u5f00\u59cb\u5c31\u8981\u653e\u5165\u6839\u8282\u70b9&#xff1a;<\/p>\n<p>q <span class=\"token operator\">&#061;<\/span> deque<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span>root<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u6ce8\u610f&#xff0c;\u8fd9\u91cc\u653e\u8fdb\u53bb\u7684\u662f \u6839\u8282\u70b9\u8fd9\u4e2a TreeNode \u5bf9\u8c61&#xff0c;\u4e0d\u662f\u628a\u6574\u68f5\u6811\u8f6c\u6362\u6210\u961f\u5217\u3002<\/p>\n<hr \/>\n<h4>2. \u4ece\u961f\u5c3e\u52a0\u5165\u5143\u7d20<\/h4>\n<p>q<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>q<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">.<\/span>left<span class=\"token punctuation\">)<\/span><br \/>\nq<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">.<\/span>right<span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<h4>3. \u4ece\u961f\u9996\u53d6\u51fa\u5143\u7d20<\/h4>\n<p>node <span class=\"token operator\">&#061;<\/span> q<span class=\"token punctuation\">.<\/span>popleft<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>popleft() \u4f1a\u628a\u6700\u65e9\u8fdb\u5165\u961f\u5217\u7684\u5143\u7d20\u53d6\u51fa\u6765\u3002<\/p>\n<p>\u8fd9\u6b63\u597d\u7b26\u5408&#xff1a;<\/p>\n<p>\u5148\u8fdb\u5148\u51fa<\/p>\n<hr \/>\n<h4>4. \u67e5\u770b\u5f53\u524d\u961f\u5217\u957f\u5ea6<\/h4>\n<p><span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5728\u8fd9\u9053\u9898\u91cc&#xff0c;\u8fd9\u4e00\u6b65\u975e\u5e38\u91cd\u8981&#xff0c;\u56e0\u4e3a&#xff1a;<\/p>\n<p>level_size <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u53ef\u4ee5\u8bb0\u5f55 \u5f53\u524d\u8fd9\u4e00\u5c42\u6709\u591a\u5c11\u4e2a\u8282\u70b9\u3002<\/p>\n<hr \/>\n<h2>\u4e3a\u4ec0\u4e48\u961f\u5217\u53ef\u4ee5\u89e3\u51b3\u6700\u5927\u6df1\u5ea6&#xff1f;<\/h2>\n<p>BFS \u662f\u5e7f\u5ea6\u4f18\u5148\u641c\u7d22\u3002<\/p>\n<p>\u548c DFS \u4e00\u6761\u8def\u5f84\u4e00\u76f4\u5f80\u4e0b\u8d70\u4e0d\u540c&#xff0c;BFS \u662f&#xff1a;<\/p>\n<p>\u4e00\u5c42\u4e00\u5c42\u904d\u5386\u4e8c\u53c9\u6811\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>        3<br \/>\n       \/ \\\\<br \/>\n      9   20<br \/>\n         \/  \\\\<br \/>\n        15   7<\/p>\n<p>BFS \u7684\u904d\u5386\u8fc7\u7a0b\u53ef\u4ee5\u7406\u89e3\u6210&#xff1a;<\/p>\n<p>\u7b2c 1 \u5c42&#xff1a;<br \/>\n3<\/p>\n<p>\u7b2c 2 \u5c42&#xff1a;<br \/>\n9 20<\/p>\n<p>\u7b2c 3 \u5c42&#xff1a;<br \/>\n15 7<\/p>\n<p>\u6240\u4ee5\u8fd9\u9053\u9898\u6709\u4e00\u4e2a\u5f88\u76f4\u63a5\u7684\u601d\u8def&#xff1a;<\/p>\n<p>\u904d\u5386\u4e86\u591a\u5c11\u5c42&#xff0c;\u6700\u5927\u6df1\u5ea6\u5c31\u662f\u591a\u5c11\u3002<\/p>\n<hr \/>\n<h2>\u6574\u4f53\u6d41\u7a0b<\/h2>\n<p>\u5148\u5224\u65ad\u7279\u6b8a\u60c5\u51b5&#xff1a;<\/p>\n<p><span class=\"token keyword\">if<\/span> root <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><\/p>\n<p>\u5982\u679c\u6839\u8282\u70b9\u4e3a\u7a7a&#xff0c;\u8bf4\u660e\u6574\u68f5\u6811\u90fd\u4e0d\u5b58\u5728&#xff0c;\u6df1\u5ea6\u5c31\u662f 0\u3002<\/p>\n<p>\u4e5f\u5c31\u662f\u5176\u4e2d\u4e00\u4e2a\u6d4b\u8bd5\u7528\u4f8b&#xff1a;<\/p>\n<p>root <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>\u7136\u540e&#xff1a;<\/p>\n<p>q <span class=\"token operator\">&#061;<\/span> deque<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span>root<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\ndepth <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><\/p>\n<p>\u6b64\u65f6\u961f\u5217\u4e2d\u53ea\u6709\u6839\u8282\u70b9\u3002<\/p>\n<hr \/>\n<h3>\u7b2c\u4e00\u8f6e<\/h3>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>q &#061; [3]<\/p>\n<p>\u5148\u8bb0\u5f55&#xff1a;<\/p>\n<p>level_size <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5f97\u5230&#xff1a;<\/p>\n<p>level_size &#061; 1<\/p>\n<p>\u8bf4\u660e\u5f53\u524d\u8fd9\u4e00\u5c42\u53ea\u6709\u4e00\u4e2a\u8282\u70b9\u3002<\/p>\n<p>\u7136\u540e&#xff1a;<\/p>\n<p><span class=\"token keyword\">for<\/span> _ <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span>level_size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><\/p>\n<p>\u53ea\u5faa\u73af\u4e00\u6b21\u3002<\/p>\n<p>\u53d6\u51fa&#xff1a;<\/p>\n<p>node <span class=\"token operator\">&#061;<\/span> q<span class=\"token punctuation\">.<\/span>popleft<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5f97\u5230&#xff1a;<\/p>\n<p>3<\/p>\n<p>\u7136\u540e\u628a\u5b83\u7684\u5de6\u53f3\u5b69\u5b50\u52a0\u5165\u961f\u5217&#xff1a;<\/p>\n<p>q &#061; [9, 20]<\/p>\n<p>\u8fd9\u4e00\u5c42\u5904\u7406\u5b8c&#xff1a;<\/p>\n<p>depth <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1<\/span><\/p>\n<p>\u6240\u4ee5&#xff1a;<\/p>\n<p>depth &#061; 1<\/p>\n<hr \/>\n<h3>\u7b2c\u4e8c\u8f6e<\/h3>\n<p>\u6b64\u65f6&#xff1a;<\/p>\n<p>q &#061; [9, 20]<\/p>\n<p>\u6240\u4ee5&#xff1a;<\/p>\n<p>level_size <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><\/p>\n<p>\u8fd9\u4e00\u5c42\u6709\u4e24\u4e2a\u8282\u70b9&#xff0c;\u9700\u8981\u5faa\u73af\u4e24\u6b21\u3002<\/p>\n<p>\u7b2c\u4e00\u6b21&#xff1a;<\/p>\n<p>\u5f39\u51fa 9<\/p>\n<p>9 \u6ca1\u6709\u5de6\u53f3\u5b69\u5b50&#xff0c;\u6240\u4ee5\u4e0d\u52a0\u5165\u65b0\u7684\u8282\u70b9\u3002<\/p>\n<p>\u6b64\u65f6&#xff1a;<\/p>\n<p>q &#061; [20]<\/p>\n<p>\u7b2c\u4e8c\u6b21&#xff1a;<\/p>\n<p>\u5f39\u51fa 20<\/p>\n<p>20 \u6709\u4e24\u4e2a\u5b69\u5b50&#xff1a;<\/p>\n<p>15<br \/>\n7<\/p>\n<p>\u52a0\u5165\u961f\u5c3e&#xff1a;<\/p>\n<p>q &#061; [15, 7]<\/p>\n<p>\u7b2c\u4e8c\u5c42\u5904\u7406\u5b8c&#xff1a;<\/p>\n<p>depth &#061; 2<\/p>\n<hr \/>\n<h3>\u7b2c\u4e09\u8f6e<\/h3>\n<p>\u6b64\u65f6&#xff1a;<\/p>\n<p>q &#061; [15, 7]<\/p>\n<p>\u4e24\u4e2a\u8282\u70b9\u90fd\u6ca1\u6709\u5b69\u5b50\u3002<\/p>\n<p>\u628a\u5b83\u4eec\u5f39\u51fa\u4e4b\u540e&#xff0c;\u4e0d\u518d\u52a0\u5165\u65b0\u7684\u8282\u70b9\u3002<\/p>\n<p>\u6700\u540e&#xff1a;<\/p>\n<p>q &#061; []<\/p>\n<p>\u8fd9\u4e00\u5c42\u7ed3\u675f&#xff1a;<\/p>\n<p>depth &#061; 3<\/p>\n<p>\u56e0\u4e3a\u961f\u5217\u5df2\u7ecf\u4e3a\u7a7a&#xff1a;<\/p>\n<p><span class=\"token keyword\">while<\/span> q<span class=\"token punctuation\">:<\/span><\/p>\n<p>\u4e0d\u518d\u6ee1\u8db3&#xff0c;\u5faa\u73af\u7ed3\u675f\u3002<\/p>\n<p>\u6700\u7ec8&#xff1a;<\/p>\n<p>\u6700\u5927\u6df1\u5ea6 &#061; 3<\/p>\n<hr \/>\n<h2>\u4e3a\u4ec0\u4e48\u8981\u5148\u8bb0\u5f55 level_size&#xff1f;<\/h2>\n<p>\u8fd9\u4e00\u53e5&#xff1a;<\/p>\n<p>level_size <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u975e\u5e38\u5173\u952e\u3002<\/p>\n<p>\u56e0\u4e3a\u5728\u5904\u7406\u5f53\u524d\u8fd9\u4e00\u5c42\u65f6&#xff0c;\u6211\u4eec\u4f1a\u4e0d\u65ad\u628a\u4e0b\u4e00\u5c42\u7684\u8282\u70b9\u52a0\u5165\u961f\u5217\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>\u5f53\u524d&#xff1a;<br \/>\nq &#061; [9, 20]<\/p>\n<p>\u5904\u7406 20 \u65f6&#xff0c;\u53c8\u4f1a\u52a0\u5165&#xff1a;<\/p>\n<p>15, 7<\/p>\n<p>\u5982\u679c\u4e0d\u63d0\u524d\u8bb0\u5f55&#xff1a;<\/p>\n<p>level_size <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><\/p>\n<p>\u5f53\u524d\u5c42\u548c\u4e0b\u4e00\u5c42\u5c31\u4f1a\u6df7\u5728\u4e00\u8d77\u3002<\/p>\n<p>\u6240\u4ee5&#xff1a;<\/p>\n<p>level_size <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u76f8\u5f53\u4e8e\u5148\u628a&#xff1a;<\/p>\n<p>\u8fd9\u4e00\u5c42\u9700\u8981\u5904\u7406\u51e0\u4e2a\u8282\u70b9<\/p>\n<p>\u56fa\u5b9a\u4e0b\u6765\u3002<\/p>\n<hr \/>\n<h2>\u6700\u7ec8\u4ee3\u7801<\/h2>\n<p><span class=\"token keyword\">from<\/span> collections <span class=\"token keyword\">import<\/span> deque<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">def<\/span> <span class=\"token function\">maxDepth<\/span><span class=\"token punctuation\">(<\/span>self<span class=\"token punctuation\">,<\/span> root<span class=\"token punctuation\">:<\/span> Optional<span class=\"token punctuation\">[<\/span>TreeNode<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">:<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> root <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><\/p>\n<p>        q <span class=\"token operator\">&#061;<\/span> deque<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span>root<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        depth <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><\/p>\n<p>        <span class=\"token keyword\">while<\/span> q<span class=\"token punctuation\">:<\/span><br \/>\n            level_size <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span><\/p>\n<p>            <span class=\"token keyword\">for<\/span> _ <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span>level_size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                node <span class=\"token operator\">&#061;<\/span> q<span class=\"token punctuation\">.<\/span>popleft<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u5de6\u5b69\u5b50<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> node<span class=\"token punctuation\">.<\/span>left<span class=\"token punctuation\">:<\/span><br \/>\n                    q<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">.<\/span>left<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># \u53f3\u5b69\u5b50<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> node<span class=\"token punctuation\">.<\/span>right<span class=\"token punctuation\">:<\/span><br \/>\n                    q<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">.<\/span>right<span class=\"token punctuation\">)<\/span><\/p>\n<p>            depth <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> depth<\/p>\n<hr \/>\n<h2>\u8fd9\u9053\u9898\u6700\u6838\u5fc3\u7684\u601d\u8def<\/h2>\n<p>\u53ef\u4ee5\u7b80\u5355\u8bb0\u6210&#xff1a;<\/p>\n<p>\u961f\u5217\u4e2d\u4fdd\u5b58\u5f53\u524d\u5c42\u7684\u8282\u70b9<br \/>\n\u2193<br \/>\n\u8bb0\u5f55\u5f53\u524d\u5c42\u8282\u70b9\u6570\u91cf<br \/>\n\u2193<br \/>\n\u4f9d\u6b21\u5f39\u51fa\u5f53\u524d\u5c42\u8282\u70b9<br \/>\n\u2193<br \/>\n\u628a\u5b83\u4eec\u7684\u5de6\u53f3\u5b69\u5b50\u52a0\u5165\u961f\u5c3e<br \/>\n\u2193<br \/>\n\u5f53\u524d\u5c42\u5904\u7406\u5b8c\u6210<br \/>\n\u2193<br \/>\ndepth &#043; 1<br \/>\n\u2193<br \/>\n\u7ee7\u7eed\u4e0b\u4e00\u5c42<\/p>\n<p>\u8fd9\u91cc\u5229\u7528\u7684\u5c31\u662f\u961f\u5217&#xff1a;<\/p>\n<p>\u5148\u8fdb\u5148\u51fa<\/p>\n<p>\u7684\u7279\u70b9\u3002<\/p>\n<hr \/>\n<h2>DFS \u548c BFS \u7684\u533a\u522b<\/h2>\n<p>\u4e0a\u4e00\u7bc7\u4f7f\u7528\u7684\u662f&#xff1a;<\/p>\n<p>DFS &#043; \u9012\u5f52<\/p>\n<p>\u6838\u5fc3\u601d\u8def&#xff1a;<\/p>\n<p>\u5148\u4e0d\u65ad\u5f80\u6df1\u5904\u8d70<br \/>\n\u518d\u628a\u7ed3\u679c\u4e00\u5c42\u5c42\u8fd4\u56de<\/p>\n<p>\u8fd9\u4e00\u7bc7\u4f7f\u7528\u7684\u662f&#xff1a;<\/p>\n<p>BFS &#043; \u961f\u5217<\/p>\n<p>\u6838\u5fc3\u601d\u8def&#xff1a;<\/p>\n<p>\u4e00\u5c42\u4e00\u5c42\u904d\u5386<br \/>\n\u6bcf\u5904\u7406\u5b8c\u4e00\u5c42<br \/>\ndepth &#043; 1<\/p>\n<p>\u6240\u4ee5\u540c\u4e00\u9053\u9898\u53ef\u4ee5\u4ece\u4e24\u4e2a\u4e0d\u540c\u65b9\u5411\u7406\u89e3&#xff1a;<\/p>\n<p>DFS&#xff1a;<br \/>\n\u5f53\u524d\u6df1\u5ea6<br \/>\n&#061; 1 &#043; max(\u5de6\u5b50\u6811\u6df1\u5ea6, \u53f3\u5b50\u6811\u6df1\u5ea6)<\/p>\n<p>BFS&#xff1a;<br \/>\n\u904d\u5386\u4e86\u591a\u5c11\u5c42<br \/>\n&#061; \u6700\u5927\u6df1\u5ea6<\/p>\n<hr \/>\n<h2>\u590d\u6742\u5ea6\u5206\u6790<\/h2>\n<p>\u8bbe\u4e8c\u53c9\u6811\u4e00\u5171\u6709 n \u4e2a\u8282\u70b9\u3002<\/p>\n<p>\u6bcf\u4e2a\u8282\u70b9\u53ea\u4f1a\u8fdb\u5165\u961f\u5217\u4e00\u6b21\u3001\u5f39\u51fa\u4e00\u6b21\u3002<\/p>\n<p>\u6240\u4ee5&#xff1a;<\/p>\n<ul>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;O(n)<\/li>\n<\/ul>\n<p>\u961f\u5217\u4e2d\u6700\u591a\u53ef\u80fd\u540c\u65f6\u4fdd\u5b58\u67d0\u4e00\u5c42\u7684\u6240\u6709\u8282\u70b9\u3002<\/p>\n<p>\u6240\u4ee5&#xff1a;<\/p>\n<ul>\n<li>\u7a7a\u95f4\u590d\u6742\u5ea6&#xff1a;O(n)<\/li>\n<\/ul>\n<p>\u6700\u574f\u60c5\u51b5\u4e0b&#xff0c;\u67d0\u4e00\u5c42\u53ef\u80fd\u5305\u542b\u5927\u91cf\u8282\u70b9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u76ee\u5f55LeetCode 104. \u4e8c\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6 \u2014\u2014 BFS \/ \u961f\u5217\u89e3\u6cd5\u524d\u7f6e\u77e5\u8bc6&#xff1a;\u961f\u5217\u5e38\u7528\u64cd\u4f5c1. \u521b\u5efa\u961f\u52172. \u4ece\u961f\u5c3e\u52a0\u5165\u5143\u7d203. \u4ece\u961f\u9996\u53d6\u51fa\u5143\u7d204. \u67e5\u770b\u5f53\u524d\u961f\u5217\u957f\u5ea6\u4e3a\u4ec0\u4e48\u961f\u5217\u53ef\u4ee5\u89e3\u51b3\u6700\u5927\u6df1\u5ea6&#xff1f;\u6574\u4f53\u6d41\u7a0b\u7b2c\u4e00\u8f6e\u7b2c\u4e8c\u8f6e\u7b2c\u4e09\u8f6e\u4e3a\u4ec0\u4e48\u8981\u5148\u8bb0\u5f55 level_size&#xff1f;\u6700\u7ec8\u4ee3\u7801\u8fd9\u9053\u9898\u6700\u6838\u5fc3\u7684\u601d\u8defDFS \u548c BFS \u7684\u533a\u522b\u590d\u6742\u5ea6\u5206\u6790LeetCode 104. \u4e8c\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6 \u2014\u2014 BFS \/ \u961f\u5217\u89e3\u6cd5<br \/>\n\u4e0a\u4e00\u7bc7\u5df2\u7ecf\u7528 DFS  \u9012\u5f52\u89e3<\/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":[11174,2692,81,427],"topic":[],"class_list":["post-103540","post","type-post","status-publish","format-standard","hentry","category-server","tag-11174","tag-leetcode","tag-python","tag-427"],"yoast_head":"<!-- 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