{"id":439,"date":"2026-01-30T21:25:36","date_gmt":"2026-01-30T13:25:36","guid":{"rendered":"https:\/\/jdoxk3.cn\/?p=439"},"modified":"2026-01-30T21:25:37","modified_gmt":"2026-01-30T13:25:37","slug":"%e4%bb%a3%e7%a0%81%e9%9a%8f%e6%83%b3%e5%bd%95%e7%ae%97%e6%b3%95%e8%ae%ad%e7%bb%83%e8%90%a5%e7%ac%ac%e5%8d%81%e4%ba%94%e5%a4%a9-110-%e5%b9%b3%e8%a1%a1%e4%ba%8c%e5%8f%89%e6%a0%91%ef%bc%8c257-%e4%ba%8c","status":"publish","type":"post","link":"https:\/\/jdoxk3.cn\/index.php\/2026\/01\/30\/%e4%bb%a3%e7%a0%81%e9%9a%8f%e6%83%b3%e5%bd%95%e7%ae%97%e6%b3%95%e8%ae%ad%e7%bb%83%e8%90%a5%e7%ac%ac%e5%8d%81%e4%ba%94%e5%a4%a9-110-%e5%b9%b3%e8%a1%a1%e4%ba%8c%e5%8f%89%e6%a0%91%ef%bc%8c257-%e4%ba%8c\/","title":{"rendered":"\u4ee3\u7801\u968f\u60f3\u5f55\u7b97\u6cd5\u8bad\u7ec3\u8425\u7b2c\u5341\u4e94\u5929 | 110.\u5e73\u8861\u4e8c\u53c9\u6811\uff0c257.\u4e8c\u53c9\u6811\u7684\u6240\u6709\u8def\u5f84\uff0c404.\u5de6\u53f6\u5b50\u4e4b\u548c\uff0c222.\u5b8c\u5168\u4e8c\u53c9\u6811\u7684\u8282\u70b9\u4e2a\u6570"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">\u524d\u8a00<\/h1>\n\n\n\n<p>\u4eca\u5929\u662f\u7b97\u6cd5\u8bad\u7ec3\u8425\u7684\u7b2c\u5341\u4e94\u5929\uff0c\u5230\u8fd9\u91cc\u5df2\u7ecf\u534a\u4e2a\u6708\u4e86\uff0c\u72b6\u6001\u76f8\u8f83\u4e8e\u521d\u671f\u4e0b\u964d\u5f88\u660e\u663e\u3002\u4e0d\u8bf4\u4e4b\u524d\u80fd\u8d76\u7740\u51cc\u6668\u5c31\u628a\u7b2c\u4e8c\u5929\u7684\u5185\u5bb9\u641e\u5b9a\uff0c\u73b0\u5728\u4f46\u51e1\u67d0\u4e00\u5929\u6bd4\u8f83\u5fd9\u803d\u6401\u4e86\uff0c\u540e\u9762\u53ef\u80fd\u5c31\u4f1a\u8fde\u7740\u803d\u6401\u597d\u51e0\u5929\uff0c\u6ca1\u5199\u7684\u6587\u6863\u8d8a\u56e4\u8d8a\u591a&#8230;..<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">110.\u5e73\u8861\u4e8c\u53c9\u6811<\/h1>\n\n\n\n<p>\u9898\u76ee\u94fe\u63a5\uff1a<a href=\"https:\/\/leetcode.cn\/problems\/balanced-binary-tree\/\">110. \u5e73\u8861\u4e8c\u53c9\u6811<\/a><\/p>\n\n\n\n<p>\u9898\u76ee\u63cf\u8ff0\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\uff0c\u5224\u65ad\u5b83\u662f\u5426\u662f \u5e73\u8861\u4e8c\u53c9\u6811<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u601d\u8def<\/h2>\n\n\n\n<p>\u8981\u5224\u65ad\u5e73\u8861\u4e8c\u53c9\u6811\u5b9e\u9645\u4e0a\u662f\u9700\u8981\u5224\u65ad\u6240\u6709\u8282\u70b9\u7684\u5de6\u53f3\u5b50\u6811\u9ad8\u5ea6\u5dee\u662f\u5426\u5c0f\u4e8e\u4e00\uff0c\u8fd9\u79cd\u6c42\u9ad8\u5ea6\u7684\u4e8b\u60c5\u4f7f\u7528\u540e\u5e8f\u904d\u5386\u6bd4\u8f83\u5408\u9002\u3002<\/p>\n\n\n\n<p>\u4ece\u9012\u5f52\u89d2\u5ea6\u51fa\u53d1\uff0c\u4f7f\u7528\u9012\u5f52\u4e09\u6b65\u6cd5\u6765\u5206\u6790\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1.\u9996\u5148\u662f\u786e\u5b9a\u9012\u5f52\u51fd\u6570\u7684\u53c2\u6570\u548c\u8fd4\u56de\u503c<\/strong><\/h3>\n\n\n\n<p>\u5bf9\u4e8e\u8fd9\u4e2a\u60c5\u666f\u6765\u8bf4\uff0c\u6211\u4eec\u9700\u8981\u540e\u5e8f\u904d\u5386\u6c42\u51fa\u9ad8\u5ea6\u540c\u65f6\u8fd4\u56de\uff0c\u6240\u4ee5\u53c2\u6570\u662f\u9700\u8981\u6c42\u9ad8\u5ea6\u7684\u8282\u70b9\uff0c\u8fd4\u56de\u503c\u662f\u9ad8\u5ea6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;def getHeight(self, root: TreeNode) -&gt; int:<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2.\u786e\u5b9a\u7ec8\u6b62\u6761\u4ef6<\/h3>\n\n\n\n<p>\u9047\u5230\u7a7a\u8282\u70b9\u4e3a\u6b64\u5904\u7684\u7ec8\u6b62\u6761\u4ef6\uff0c\u7531\u4e8e\u6ca1\u6709\u9ad8\u5ea6\uff0c\u76f4\u63a5\u8fd4\u56de0<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u00a0if not root:\n\treturn 0<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3.\u660e\u786e\u5355\u5c42\u9012\u5f52\u7684\u903b\u8f91<\/h3>\n\n\n\n<p>\u5728\u5355\u5c42\u9012\u5f52\u4e2d\uff0c\u6211\u4eec\u7684\u76ee\u6807\u662f\u6c42\u51fa\u5f53\u524d\u8282\u70b9\u7684\u5de6\u53f3\u5b50\u6811\u9ad8\u5ea6\u5dee\u503c\uff0c\u6240\u4ee5\u8981\u505a\u7684\u5c31\u662f\u5206\u522b\u6c42\u51fa\u5de6\u53f3\u5b50\u6811\u9ad8\u5ea6\u7136\u540e\u6c42\u5dee\uff0c\u5982\u679c\u5c0f\u4e8e\u7b49\u4e8e\u4e00\u8bf4\u660e\u6b64\u5904\u4f9d\u65e7\u5e73\u8861\uff0c\u5426\u5219\u8fd4\u56de-1\u4ee3\u8868\u5df2\u7ecf\u4e0d\u662f\u4e8c\u53c9\u5e73\u8861\u6811\u4e86\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u00a0def getHeight(self, root: TreeNode) -> int:\n        if not root:\n            return 0\n        if (leftHeight := self.getHeight(root.left)) == -1:\n            return -1\n        if (rightHeight := self.getHeight(root.right)) == -1:\n            return -1\n        if abs(leftHeight - rightHeight) > 1:\n            return -1\n        else:\n            return 1 + max(leftHeight, rightHeight)<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u9012\u5f52\u6cd5\u5b8c\u6574\u5b9e\u73b0\u4ee3\u7801<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code># Definition for a binary tree node.\n# class TreeNode:\n#     def __init__(self, val=0, left=None, right=None):\n#         self.val = val\n#         self.left = left\n#         self.right = right\nclass Solution:\n    def isBalanced(self, root: Optional&#91;TreeNode]) -> bool:\n        if self.getHeight(root) != -1:\n            return True\n        else:\n            return False\n\n\n    def getHeight(self, root: TreeNode) -> int:\n        if not root:\n            return 0\n        if (leftHeight := self.getHeight(root.left)) == -1:\n            return -1\n        if (rightHeight := self.getHeight(root.right)) == -1:\n            return -1\n        if abs(leftHeight - rightHeight) > 1:\n            return -1\n        else:\n            return 1 + max(leftHeight, rightHeight)<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">257.\u4e8c\u53c9\u6811\u7684\u6240\u6709\u8def\u5f84<\/h1>\n\n\n\n<p>\u9898\u76ee\u94fe\u63a5\uff1a<a href=\"https:\/\/leetcode.cn\/problems\/binary-tree-paths\/\">257. \u4e8c\u53c9\u6811\u7684\u6240\u6709\u8def\u5f84<\/a><\/p>\n\n\n\n<p>\u9898\u76ee\u63cf\u8ff0\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u7ed9\u4f60\u4e00\u4e2a\u4e8c\u53c9\u6811\u7684\u6839\u8282\u70b9 <code>root<\/code> \uff0c\u6309 <strong>\u4efb\u610f\u987a\u5e8f<\/strong> \uff0c\u8fd4\u56de\u6240\u6709\u4ece\u6839\u8282\u70b9\u5230\u53f6\u5b50\u8282\u70b9\u7684\u8def\u5f84\u3002<\/p>\n\n\n\n<p><strong>\u53f6\u5b50\u8282\u70b9<\/strong> \u662f\u6307\u6ca1\u6709\u5b50\u8282\u70b9\u7684\u8282\u70b9\u3002<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u601d\u8def<\/h2>\n\n\n\n<p>\u7531\u4e8e\u662f\u8981\u8bb0\u5f55\u51fa\u6240\u6709\u5230\u8fbe\u53f6\u5b50\u8282\u70b9\u7684\u8def\u5f84\uff0c\u8fd9\u8fb9\u4f7f\u7528\u524d\u5e8f\u904d\u5386\u4f1a\u6bd4\u8f83\u5408\u9002\uff0c\u56e0\u4e3a\u9700\u8981\u4ece\u6839\u8282\u70b9\u51fa\u53d1\u5230\u53f6\u5b50\u8282\u70b9\u7ed3\u675f\uff0c\u8fd9\u8fb9\u8981\u7528\u5230\u56de\u6eaf\u7684\u601d\u60f3\u3002<\/p>\n\n\n\n<p>\u4f9d\u65e7\u662f\u9012\u5f52\u4e09\u6b65\u6cd5\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.\u9996\u5148\u786e\u5b9a\u9012\u5f52\u51fd\u6570\u7684\u53c2\u6570\u548c\u8fd4\u56de\u503c<\/h3>\n\n\n\n<p>\u8fd9\u8fb9\u7531\u4e8e\u662f\u8981\u8bb0\u5f55\u8def\u5f84\u8fdb\u884c\u56de\u6eaf\uff0c\u4ee5\u53ca\u627e\u5230\u8def\u7ebf\u540e\u5b58\u653e\u5230\u7ed3\u679c\u96c6\u5f53\u4e2d\uff0c\u6211\u4eec\u603b\u5171\u9700\u8981\u4f20\u5165\u4e09\u4e2a\u53c2\u6570:<\/p>\n\n\n\n<p>cur\u8bb0\u5f55\u5f53\u524d\u8282\u70b9\u3001path\u8bb0\u5f55\u8def\u5f84\u7528\u6765\u56de\u6eaf\u3001result\u662f\u7ed3\u679c\u96c6\uff0c\u6ca1\u6709\u8fd4\u56de\u503c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;def traversal(self, cur, path, result):<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2.\u786e\u5b9a\u9012\u5f52\u7ec8\u6b62\u6761\u4ef6<\/h3>\n\n\n\n<p>\u7ec8\u6b62\u6761\u4ef6\u597d\u8bf4\uff0c\u53ea\u8981\u8d70\u5230\u53f6\u5b50\u8282\u70b9\u4e86\u5c31\u53ef\u4ee5\u8fdb\u884c\u7ec8\u6b62\u4e86\uff0c\u8fd9\u8fb9\u6211\u4eec\u627e\u5230\u53f6\u5b50\u8282\u70b9\u540e\uff0c\u987a\u5e26\u5c06\u5185\u5bb9\u6dfb\u52a0\u5230\u7ed3\u679c\u96c6\u4e2d\uff0c\u7531\u4e8e\u9898\u76ee\u8981\u6c42&#8217;-&gt;&#8217;\u6240\u4ee5\u6b64\u5904\u8fd8\u9700\u8981\u8fdb\u884c\u5904\u7406\u4e00\u4e0b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u00a0if not cur.left and not cur.right:\n    sPath = '->'.join(map(str,path))\n    result.append(sPath)\n    return<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3.\u5355\u6b65\u9012\u5f52\u903b\u8f91<\/h3>\n\n\n\n<p>\u7b80\u5355\u6765\u8bf4\uff0c\u5355\u6b65\u9012\u5f52\u5148\u628a\u5f53\u524d\u8282\u70b9\u5b58\u653e\u5230\u8def\u5f84\u96c6\u4e2d\u4ee5\u5907\u56de\u6eaf\uff0c\u5982\u679c\u5df2\u7ecf\u627e\u5230\u53f6\u5b50\u8282\u70b9\u4e86\uff0c\u5c31\u8bb2\u76ee\u524d\u7684\u8def\u5f84\u96c6\u6dfb\u52a0\u8fdb\u7ed3\u679c\u96c6\u8fd4\u56de\u3002<\/p>\n\n\n\n<p>\u8fd9\u9053\u9898\u91cc\u56de\u6eaf\u7684\u601d\u60f3\u5f88\u91cd\u8981\uff0c\u6211\u4eec\u5728\u627e\u5230\u53f6\u5b50\u8282\u70b9\u4e4b\u540e\u9700\u8981\u56de\u6eaf\u5230\u4e0a\u4e00\u6b65\u770b\u770b\u8fd8\u6709\u6ca1\u6709\u5176\u4ed6\u8def\u5f84\u80fd\u8d70\u5230\u53f6\u5b50\u8282\u70b9\uff0c\u6240\u4ee5\u8fd9\u8fb9\u6211\u4eec\u9700\u8981\u5728\u5904\u7406\u5de6\u5b69\u5b50\u548c\u53f3\u5b69\u5b50\u65f6\u914d\u5957\u9644\u4e0a\u56de\u6eaf\u903b\u8f91\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u00a0def traversal(self, cur, path, result):\n        path.append(cur.val)\n        if not cur.left and not cur.right:\n            sPath = '->'.join(map(str,path))\n            result.append(sPath)\n            return\n        if cur.left:\n            self.traversal(cur.left, path, result)\n            path.pop()\n        if cur.right:\n            self.traversal(cur.right, path, result)\n            path.pop()<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u9012\u5f52\u6cd5\u5b8c\u6574\u5b9e\u73b0\u4ee3\u7801<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code># Definition for a binary tree node.\n# class TreeNode:\n#     def __init__(self, val=0, left=None, right=None):\n#         self.val = val\n#         self.left = left\n#         self.right = right\nclass Solution:\n    def binaryTreePaths(self, root: Optional&#91;TreeNode]) -> List&#91;str]:\n        result = &#91;]\n        path = &#91;]\n        if not root:\n            return result\n        self.traversal(root, path, result)\n        return result\n        \n    def traversal(self, cur, path, result):\n        path.append(cur.val)\n        if not cur.left and not cur.right:\n            sPath = '->'.join(map(str,path))\n            result.append(sPath)\n            return\n        if cur.left:\n            self.traversal(cur.left, path, result)\n            path.pop()\n        if cur.right:\n            self.traversal(cur.right, path, result)\n            path.pop()\n\u00a0\u200b<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">404.\u5de6\u53f6\u5b50\u4e4b\u548c<\/h1>\n\n\n\n<p>\u9898\u76ee\u94fe\u63a5\uff1a<a href=\"https:\/\/leetcode.cn\/problems\/sum-of-left-leaves\/\">404. \u5de6\u53f6\u5b50\u4e4b\u548c<\/a><\/p>\n\n\n\n<p>\u9898\u76ee\u63cf\u8ff0\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u7ed9\u5b9a\u4e8c\u53c9\u6811\u7684\u6839\u8282\u70b9 <code>root<\/code> \uff0c\u8fd4\u56de\u6240\u6709\u5de6\u53f6\u5b50\u4e4b\u548c\u3002<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u601d\u8def<\/h2>\n\n\n\n<p>\u8fd9\u9053\u9898\u76f8\u8f83\u4e8e\u4e0a\u4e00\u9053\u6211\u89c9\u5f97\u66f4\u5bb9\u6613\u60f3\u5230\u4e00\u4e9b\uff0c\u6211\u4eec\u9700\u8981\u505a\u7684\u4e8b\u60c5\u5c31\u662f\u6536\u96c6\u6240\u6709\u5de6\u53f6\u5b50\u8282\u70b9\u7684\u503c\u6c42\u548c\uff0c\u7531\u4e8e\u4e2d\u5e8f\u904d\u5386\u662f\u5148\u67e5\u770b\u5de6\uff0c\u6240\u4ee5\u6b64\u5904\u7528\u4e2d\u5e8f\u904d\u5386\u6bd4\u8f83\u5408\u9002\u3002<\/p>\n\n\n\n<p>\u90a3\u4e48\u8fd8\u662f\u9012\u5f52\u4e09\u6b65\u6cd5\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.\u786e\u5b9a\u9012\u5f52\u51fd\u6570\u53c2\u6570\u548c\u8fd4\u56de\u503c\uff1a<\/h3>\n\n\n\n<p>\u53c2\u6570\u53ea\u8981\u4f20\u5165\u4e00\u4e2a\u6811\u8282\u70b9\u5c31\u884c\uff0c\u8fd4\u56de\u503c\u662f\u6574\u6570\u548c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;def sumOfLeftLeaves(self, root: Optional&#91;TreeNode]) -&gt; int:<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2.\u786e\u5b9a\u9012\u5f52\u7ec8\u6b62\u6761\u4ef6<\/h3>\n\n\n\n<p>\u8fd9\u9053\u9898\u91cc\u6211\u4eec\u53ea\u8981\u627e\u5230\u5de6\u53f6\u5b50\u5e76\u5c06\u548c\u7ed9\u8bb0\u5f55\u5373\u53ef\uff0c\u5224\u65ad\u662f\u5426\u662f\u5de6\u53f6\u5b50\u53ea\u8981\u5224\u65ad\u8be5\u8282\u70b9\u662f\u5426\u8fd8\u6709\u5de6\u5b69\u5b50\u6216\u53f3\u5b69\u5b50\u8282\u70b9\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u00a0if root.left and not root.left.left and not root.left.right:\n\tleftValue = root.left.val<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3.\u5355\u6b21\u5faa\u73af\u903b\u8f91<\/h3>\n\n\n\n<p>\u8fd9\u91cc\u9075\u5faa\u524d\u5e8f\u904d\u5386\u903b\u8f91\uff0c\u603b\u4f53\u6765\u8bf4\u6bd4\u8f83\u597d\u7406\u89e3<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>    leftValue = self.sumOfLeftLeaves(root.left)\n    if root.left and not root.left.left and not root.left.right:\n        leftValue = root.left.val\n    rightValue = self.sumOfLeftLeaves(root.right)<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u9012\u5f52\u6cd5\u5b8c\u6574\u5b9e\u73b0\u4ee3\u7801<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\u00a0# Definition for a binary tree node.\n# class TreeNode:\n#     def __init__(self, val=0, left=None, right=None):\n#         self.val = val\n#         self.left = left\n#         self.right = right\nclass Solution:\n    def sumOfLeftLeaves(self, root: Optional&#91;TreeNode]) -> int:\n        if not root:\n            return 0\n        if not root.left and not root.right:\n            return 0\n        \n        leftValue = self.sumOfLeftLeaves(root.left)\n        if root.left and not root.left.left and not root.left.right:\n            leftValue = root.left.val\n        \n        rightValue = self.sumOfLeftLeaves(root.right)\n\n        sumVal = leftValue + rightValue\n        return sumVal<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">272.\u5b8c\u5168\u4e8c\u53c9\u6811\u7684\u8282\u70b9\u4e2a\u6570<\/h1>\n\n\n\n<p>\u9898\u76ee\u94fe\u63a5\uff1a<a href=\"https:\/\/leetcode.cn\/problems\/count-complete-tree-nodes\/\">222. \u5b8c\u5168\u4e8c\u53c9\u6811\u7684\u8282\u70b9\u4e2a\u6570<\/a><\/p>\n\n\n\n<p>\u9898\u76ee\u63cf\u8ff0\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u7ed9\u4f60\u4e00\u68f5 <strong>\u5b8c\u5168\u4e8c\u53c9\u6811<\/strong> \u7684\u6839\u8282\u70b9 <code>root<\/code> \uff0c\u6c42\u51fa\u8be5\u6811\u7684\u8282\u70b9\u4e2a\u6570\u3002<\/p>\n\n\n\n<p><a href=\"https:\/\/baike.baidu.com\/item\/%E5%AE%8C%E5%85%A8%E4%BA%8C%E5%8F%89%E6%A0%91\/7773232?fr=aladdin\">\u5b8c\u5168\u4e8c\u53c9\u6811<\/a> \u7684\u5b9a\u4e49\u5982\u4e0b\uff1a\u5728\u5b8c\u5168\u4e8c\u53c9\u6811\u4e2d\uff0c\u9664\u4e86\u6700\u5e95\u5c42\u8282\u70b9\u53ef\u80fd\u6ca1\u586b\u6ee1\u5916\uff0c\u5176\u4f59\u6bcf\u5c42\u8282\u70b9\u6570\u90fd\u8fbe\u5230\u6700\u5927\u503c\uff0c\u5e76\u4e14\u6700\u4e0b\u9762\u4e00\u5c42\u7684\u8282\u70b9\u90fd\u96c6\u4e2d\u5728\u8be5\u5c42\u6700\u5de6\u8fb9\u7684\u82e5\u5e72\u4f4d\u7f6e\u3002\u82e5\u6700\u5e95\u5c42\u4e3a\u7b2c <code>h<\/code> \u5c42\uff08\u4ece\u7b2c 0 \u5c42\u5f00\u59cb\uff09\uff0c\u5219\u8be5\u5c42\u5305\u542b <code>1~ 2h<\/code> \u4e2a\u8282\u70b9\u3002<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u601d\u8def<\/h2>\n\n\n\n<p>\u8fd9\u9053\u9898\u6ca1\u600e\u4e48\u52a8\u8111\u5b50\uff0c\u7528\u5c42\u5e8f\u904d\u5386\u76f4\u63a5\u79d2\u4e86\uff0c\u8bb0\u5f55\u4e0b\u6bcf\u4e00\u5c42\u5927\u5c0f\u518d\u52a0\u8d77\u6765\u5c31\u7ed3\u675f\u4e86\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5c42\u5e8f\u904d\u5386\u5b9e\u73b0\u5199\u6cd5<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\u00a0# Definition for a binary tree node.\n# class TreeNode:\n#     def __init__(self, val=0, left=None, right=None):\n#         self.val = val\n#         self.left = left\n#         self.right = right\nclass Solution:\n    def countNodes(self, root: Optional&#91;TreeNode]) -> int:\n        if not root:\n            return 0\n        queue = collections.deque(&#91;root])\n        ans = 0\n        while queue:\n            levelSize = len(queue)\n            ans += levelSize\n            for _ in range(levelSize):\n                node = queue.popleft()\n                if node.left: queue.append(node.left)\n                if node.right: queue.append(node.right)\n        return ans<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">\u603b\u7ed3<\/h1>\n\n\n\n<p>\u4eca\u5929\u7684\u9898\u76ee\u603b\u4f53\u6765\u8bf4\u80fd\u7406\u89e3\u601d\u8def\uff0c\u80fd\u611f\u89c9\u5230\u9012\u5f52\u5728\u4e8c\u53c9\u6811\u8fd9\u4e00\u7ae0\u8282\u7b97\u662f\u6a2a\u7740\u8d70\uff0c\u8fd9\u8fb9\u4e5f\u662f\u8ba9\u6211\u72e0\u72e0\u8bad\u7ec3\u4e86\u4e00\u4e0b\u9012\u5f52\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00 \u4eca\u5929\u662f\u7b97\u6cd5\u8bad\u7ec3\u8425\u7684\u7b2c\u5341\u4e94\u5929\uff0c\u5230\u8fd9\u91cc\u5df2\u7ecf\u534a\u4e2a\u6708\u4e86\uff0c\u72b6\u6001\u76f8\u8f83\u4e8e\u521d\u671f\u4e0b\u964d\u5f88\u660e\u663e\u3002\u4e0d\u8bf4\u4e4b\u524d\u80fd\u8d76\u7740\u51cc\u6668\u5c31\u628a\u7b2c\u4e8c\u5929\u7684 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[13,15,14],"class_list":["post-439","post","type-post","status-publish","format-standard","hentry","category-python","tag-python","tag-15","tag-14"],"_links":{"self":[{"href":"https:\/\/jdoxk3.cn\/index.php\/wp-json\/wp\/v2\/posts\/439","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jdoxk3.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jdoxk3.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jdoxk3.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jdoxk3.cn\/index.php\/wp-json\/wp\/v2\/comments?post=439"}],"version-history":[{"count":2,"href":"https:\/\/jdoxk3.cn\/index.php\/wp-json\/wp\/v2\/posts\/439\/revisions"}],"predecessor-version":[{"id":441,"href":"https:\/\/jdoxk3.cn\/index.php\/wp-json\/wp\/v2\/posts\/439\/revisions\/441"}],"wp:attachment":[{"href":"https:\/\/jdoxk3.cn\/index.php\/wp-json\/wp\/v2\/media?parent=439"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jdoxk3.cn\/index.php\/wp-json\/wp\/v2\/categories?post=439"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jdoxk3.cn\/index.php\/wp-json\/wp\/v2\/tags?post=439"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}