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\u524d\u8a00<\/h1>\n\n\n\n

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\n

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    \n
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      \n
    • \u6df1\u5ea6\u4f18\u5148\u904d\u5386DFS\uff1a\n
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            \n
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          • \u4e2d\u5e8f\u904d\u5386\uff1a\u5de6\u4e2d\u53f3<\/li>\n\n\n\n
          • \u540e\u5e8f\u904d\u5386\uff1a\u5de6\u53f3\u4e2d<\/li>\n<\/ul>\n\n\n\n
            \"\"<\/div><\/figure>\n\n\n\n

            \u4e8c\u53c9\u6811\u7684\u5b9a\u4e49<\/h2>\n\n\n\n

            \u4e3b\u8981\u5c55\u793a\u94fe\u5f0f\u5b58\u50a8\u7684\u4e8c\u53c9\u6811\u8282\u70b9\u5b9a\u4e49\u65b9\u6cd5<\/p>\n\n\n\n

            class TreeNode:\n    def __init__(self, val, left = None, right = None):\n        self.val = val\n        self.left = left\n        self.right = right<\/code><\/pre>\n\n\n\n
            \u4e8c\u53c9\u6811\u7684\u9012\u5f52\u904d\u5386<\/h1>\n\n\n\n
            \u867d\u7136\u8bf4\u4e8c\u53c9\u6811\u548c\u9012\u5f52\u8131\u4e0d\u5f00\u5173\u7cfb\uff0c\u800c\u4e14\u4f7f\u7528\u9012\u5f52\u6765\u904d\u5386\u4e8c\u53c9\u6811\u76f8\u8f83\u4e8e\u8fed\u4ee3\u6cd5\u5199\u6cd5\u4e5f\u66f4\u52a0\u7b80\u5355\uff0c\u4f46\u6211\u4e2a\u4eba\u800c\u8a00\u66f4\u52a0\u503e\u5411\u4e8e\u4f7f\u7528\u8fed\u4ee3\u6cd5\u6765\u5b9e\u73b0\uff0c\u4e3b\u8981\u539f\u56e0\u53ef\u80fd\u662f\u56e0\u4e3a\u5bf9\u9012\u5f52\u7684\u7406\u89e3\u6df1\u5ea6\u8fd8\u4e0d\u591f\u52a0\u4e0a\u4e00\u4e9b\u538c\u6076\u9012\u5f52\u7684\u6ee4\u955c\u3002<\/p>\n\n\n\n
            \u9012\u5f52\u7b97\u6cd5\u5177\u6709\u65b9\u6cd5\u8bba\uff0c\u6bcf\u6b21\u5199\u9012\u5f52\u90fd\u8981\u786e\u5b9a\u4ee5\u4e0b\u4e09\u4e2a\u8981\u7d20\uff0c\u53ef\u4ee5\u63d0\u9ad8\u9012\u5f52\u6b63\u786e\u6027\uff1a<\/p>\n\n\n\n
              \n
            1. \u786e\u5b9a\u9012\u5f52\u51fd\u6570\u7684\u53c2\u6570\u548c\u8fd4\u56de\u503c\uff1a<\/strong> \u786e\u5b9a\u54ea\u4e9b\u53c2\u6570\u662f\u9012\u5f52\u7684\u8fc7\u7a0b\u4e2d\u9700\u8981\u5904\u7406\u7684\uff0c\u90a3\u4e48\u5c31\u5728\u9012\u5f52\u51fd\u6570\u91cc\u52a0\u4e0a\u8fd9\u4e2a\u53c2\u6570\uff0c \u5e76\u4e14\u8fd8\u8981\u660e\u786e\u6bcf\u6b21\u9012\u5f52\u7684\u8fd4\u56de\u503c\u662f\u4ec0\u4e48\u8fdb\u800c\u786e\u5b9a\u9012\u5f52\u51fd\u6570\u7684\u8fd4\u56de\u7c7b\u578b\u3002<\/li>\n\n\n\n
            2. \u786e\u5b9a\u7ec8\u6b62\u6761\u4ef6\uff1a<\/strong> \u5199\u5b8c\u4e86\u9012\u5f52\u7b97\u6cd5, \u8fd0\u884c\u7684\u65f6\u5019\uff0c\u7ecf\u5e38\u4f1a\u9047\u5230\u6808\u6ea2\u51fa\u7684\u9519\u8bef\uff0c\u5c31\u662f\u6ca1\u5199\u7ec8\u6b62\u6761\u4ef6\u6216\u8005\u7ec8\u6b62\u6761\u4ef6\u5199\u7684\u4e0d\u5bf9\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4e5f\u662f\u7528\u4e00\u4e2a\u6808\u7684\u7ed3\u6784\u6765\u4fdd\u5b58\u6bcf\u4e00\u5c42\u9012\u5f52\u7684\u4fe1\u606f\uff0c\u5982\u679c\u9012\u5f52\u6ca1\u6709\u7ec8\u6b62\uff0c\u64cd\u4f5c\u7cfb\u7edf\u7684\u5185\u5b58\u6808\u5fc5\u7136\u5c31\u4f1a\u6ea2\u51fa\u3002<\/li>\n\n\n\n
            3. \u786e\u5b9a\u5355\u5c42\u9012\u5f52\u7684\u903b\u8f91\uff1a<\/strong> \u786e\u5b9a\u6bcf\u4e00\u5c42\u9012\u5f52\u9700\u8981\u5904\u7406\u7684\u4fe1\u606f\u3002\u5728\u8fd9\u91cc\u4e5f\u5c31\u4f1a\u91cd\u590d\u8c03\u7528\u81ea\u5df1\u6765\u5b9e\u73b0\u9012\u5f52\u7684\u8fc7\u7a0b\u3002<\/li>\n<\/ol>\n\n\n\n
              \u4e0b\u9762\u4ee5\u524d\u5e8f\u904d\u5386<\/code>\u4f5c\u4e3a\u4f8b\u5b50\uff0c\u6a21\u62df\u65b9\u6cd5\u8bba\u7684\u601d\u8003\u8fc7\u7a0b\uff08\u5199\u7684\u4f2a\u4ee3\u7801\uff09\uff1a<\/p>\n\n\n\n
              \u7b2c\u4e00\u6b65\uff1a\u786e\u5b9a\u9012\u5f52\u51fd\u6570\u7684\u53c2\u6570\u548c\u8fd4\u56de\u503c\uff1a<\/strong><\/p>\n\n\n\n
              \u8fd9\u4e00\u6b65\u5728python\u91cc\u5c31\u90a3\u5565\u591a\u4e86\uff0c\u56e0\u4e3apython\u4e2d\u662f\u5148\u5b9a\u4e49\u4e00\u4e2a\u6570\u7ec4\u6700\u540e\u518d\u8f93\u51fa\u6570\u7ec4\u7684<\/p>\n\n\n\n
              res = []return res<\/code><\/pre>\n\n\n\n
              \u7b2c\u4e8c\u6b65\uff1a\u786e\u5b9a\u7ec8\u6b62\u6761\u4ef6\uff1a<\/strong><\/p>\n\n\n\n
              \u8fd9\u8fb9\u662f\u8d70\u5230\u53f6\u5b50\u8282\u70b9\u5c31\u56de\u5934\uff0c\u7b26\u5408\u6df1\u5ea6\u4f18\u5148\u904d\u5386<\/code>\uff1a<\/p>\n\n\n\n
              def dfs(node):    if node is None:        return<\/code><\/pre>\n\n\n\n
              \u7b2c\u4e09\u6b65\uff1a\u786e\u5b9a\u5355\u5c42\u9012\u5f52\u7684\u903b\u8f91\uff1a<\/strong><\/p>\n\n\n\n
              \u7531\u4e8e\u662f\u524d\u5e8f\u904d\u5386<\/code>\uff0c\u6240\u4ee5\u662f\u5148\u5904\u7406\u4e2d\u95f4\u8282\u70b9\uff0c\u518d\u5904\u7406\u5de6\u8282\u70b9\uff0c\u6700\u540e\u5904\u7406\u53f3\u8282\u70b9\u3002<\/p>\n\n\n\n
              res.append(node.val) #\u5148\u5904\u7406\u4e2d\u95f4\u8282\u70b9\ndfs(node.left)\t\t #\u518d\u5904\u7406\u5de6\u8282\u70b9\ndfs(node.right)\t\t #\u6700\u540e\u5904\u7406\u53f3\u8282\u70b9<\/code><\/pre>\n\n\n\n
              \u5c06\u4ee5\u4e0a\u5185\u5bb9\u6574\u5408\uff0c\u53ef\u5f97\u5230\u5177\u4f53\u5b9e\u73b0\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
              class Solution:\n    def preorderTraversal(self, root: TreeNode) -> List[int]:\n        res = []\n        \n        def dfs(node):\n            if node is None:\n                return \n            res.append(node.val)\n            dfs(node.left)\n            dfs(node.left)\n        \n        dfs(root)\n        return res<\/code><\/pre>\n\n\n\n
              \u6709\u4e86\u524d\u5e8f\u904d\u5386<\/code>\u540e\u518d\u5b9e\u73b0\u4e2d\u5e8f\u904d\u5386<\/code>\u548c\u540e\u7eed\u904d\u5386<\/code>\u7406\u89e3\u8d77\u6765\u5c31\u6bd4\u8f83\u7b80\u5355\u4e86\u3002<\/p>\n\n\n\n
              \u4e2d\u5e8f\u904d\u5386\uff1a<\/p>\n\n\n\n
              def dfs(node):\n    if node is None:\n        return\n    dfs(node.left)\n    res.append(node.val)\n    dfs(node.right)<\/code><\/pre>\n\n\n\n
              \u540e\u5e8f\u904d\u5386\uff1a<\/p>\n\n\n\n
              def dfs(node):\n    if node is None:\n        return\n    dfs(node.left)\n    dfs(node.right)\n    res.append(node.val)<\/code><\/pre>\n\n\n\n
              \u4e8c\u53c9\u6811\u7684\u8fed\u4ee3\u904d\u5386<\/h1>\n\n\n\n
              \u4e8c\u53c9\u6811\u7684\u8fed\u4ee3\u904d\u5386\u4e3b\u8981\u4f7f\u7528\u6808\u6765\u5b9e\u73b0\uff0c\u4e0e\u9012\u5f52\u904d\u5386\u4e0d\u540c\uff0c\u5982\u679c\u4f7f\u7528\u8fed\u4ee3\u904d\u5386\u6765\u5904\u7406\u4e8c\u53c9\u6811\uff0c\u90a3\u4e48\u9700\u8981\u6ce8\u610f\u524d\u4e2d\u540e\u4e09\u79cd\u904d\u5386\u7684\u5199\u6cd5\u5b58\u5728\u5f88\u5927\u5dee\u522b\u3002<\/p>\n\n\n\n
              \u8fed\u4ee3\u6cd5\u524d\u5e8f\u904d\u5386<\/h2>\n\n\n\n
              \u524d\u5e8f\u904d\u5386<\/code>\u65f6\u7684\u5904\u7406\u903b\u8f91\u662f\u4e2d\u5de6\u53f3\uff0c\u5982\u679c\u4f7f\u7528\u8fed\u4ee3\u6cd5\u6211\u4eec\u8981\u6ce8\u610f\u6808\u662f\u540e\u8fdb\u5148\u51fa\uff0c\u6240\u4ee5\u4e3a\u4e86\u6a21\u62df\u51fa\u4e2d\u5de6\u53f3\u7684\u987a\u5e8f\uff0c\u6211\u4eec\u9700\u8981\u5148\u628a\u6839\u8282\u70b9\u538b\u5165\u6808\u4e2d\uff0c\u6839\u8282\u70b9\u51fa\u6808\u540e\uff0c\u7136\u540e\u518d\u538b\u5165\u53f3\u5b69\u5b50\u8282\u70b9\uff0c\u6700\u540e\u538b\u5165\u5de6\u5b69\u5b50\u8282\u70b9\uff0c\u8fd9\u6837\u624d\u80fd\u4f7f\u5f97\u51fa\u6808\u987a\u5e8f\u4e3a\u4e2d\u5de6\u53f3\u3002<\/p>\n\n\n\n
              \u8fd9\u8fb9\u501f\u7528\u4ee3\u7801\u968f\u60f3\u5f55\u7684\u52a8\u753bgif\u6a21\u62df\u8fc7\u7a0b\uff1a<\/p>\n\n\n\n
              \"\u4e8c\u53c9\u6811\u524d\u5e8f\u904d\u5386\uff08\u8fed\u4ee3\u6cd5\uff09\"\/<\/div><\/figure>\n\n\n\n
              \u6839\u636e\u4ee5\u4e0a\u539f\u7406\uff0c\u5199\u51fa\u5982\u4e0b\u5b9e\u73b0\u65b9\u5f0f\uff1a<\/p>\n\n\n\n
              class Solution:\n    def preorderTraversal(self, root: TreeNode) -> List[int]:\n        if not root:\n            return []\n        stack = [root]\n        ans = []\n        while stack:\n            node = stack.pop()\n            ans.append(node.val)\n            if node.right:\n            \tstack.append(node.right)\n            if node.left:\n            \tstack.append(node.left)\n        return ans<\/code><\/pre>\n\n\n\n
              \u8fed\u4ee3\u6cd5\u4e2d\u5e8f\u904d\u5386<\/h2>\n\n\n\n
              \u8fed\u4ee3\u6cd5\u548c\u9012\u5f52\u6cd5\u4e0d\u540c\uff0c\u5728\u9012\u5f52\u6cd5\u91cc\u6211\u4eec\u53ea\u8981\u5bf9\u524d\u5e8f\u904d\u5386<\/code>\u7684\u5904\u7406\u987a\u5e8f\u7a0d\u4f5c\u4fee\u6539\u5c31\u80fd\u5f97\u5230\u4e2d\u5e8f\u904d\u5386<\/code>\u7684\u5199\u6cd5\uff0c\u4f46\u7531\u4e8e\u4e2d\u5e8f\u904d\u5386<\/code>\u9700\u8981\u4e00\u76f4\u8bbf\u95ee\u5230\u5de6\u5b69\u5b50\u7684\u53f6\u5b50\u8282\u70b9\u4e0a\u624d\u4f1a\u56de\u6eaf\u5f00\u59cb\u904d\u5386\uff0c\u4e2d\u5e8f\u904d\u5386<\/code>\u5b58\u5728\u5904\u7406\u987a\u5e8f\u548c\u8bbf\u95ee\u987a\u5e8f\u4e0d\u4e00\u81f4\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n
              \u5728\u4f7f\u7528\u8fed\u4ee3\u6cd5\u5199\u4e2d\u5e8f\u904d\u5386<\/code>\u65f6\uff0c\u9700\u8981\u501f\u7528\u6307\u9488\u7684\u904d\u5386\u6765\u5e2e\u52a9\u8bbf\u95ee\u8282\u70b9\uff0c\u6808\u4e3b\u8981\u7528\u6765\u5904\u7406\u8282\u70b9\u4e0a\u7684\u5143\u7d20\u3002<\/strong><\/p>\n\n\n\n
              class Solution:\n    def inorderTraversal(self, root: TreeNode) -> List[int]:\n        if not root:\n            return []\n        stack = []\n        res = []\n        cur = root\n        while cur or stack:\n            if cur:\n                stack.append(cur)\n                cur = cur.left\n            else:\n                cur = stack.pop()\n                res.append(cur.val)\n                cur = cur.right\n        return res<\/code><\/pre>\n\n\n\n
              \u8fed\u4ee3\u6cd5\u540e\u5e8f\u904d\u5386<\/h2>\n\n\n\n
              \u540e\u5e8f\u904d\u5386\u548c\u524d\u5e8f\u904d\u5386\u6bd4\u8f83\u76f8\u4f3c\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5bf9\u524d\u5e8f\u904d\u5386\u7684\u5904\u7406\u987a\u5e8f\u7a0d\u4f5c\u4fee\u6539\u5c31\u80fd\u5f97\u5230\u540e\u5e8f\u904d\u5386\uff0c\u5177\u4f53\u4fee\u6539\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n\n\n\n
              \"\u524d\u5e8f\u5230\u540e\u5e8f\"\/<\/div><\/figure>\n\n\n\n
              \u540e\u5e8f\u904d\u5386\u7684\u5b9e\u73b0\u5199\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
              class Solution:\n    def postorderTraversal(self, root: TreeNode) -> List[int]:\n        if not root:\n            return []\n        stack = [root]\n        res = []\n        while stack:\n            node = stack.pop()\n            res.append(node.val)\n            if node.left:\n                stack.append(node.left)\n            if node.right:\n                stack.append(node.right)\n        return res[::-1]<\/code><\/pre>\n\n\n\n
              \u4e8c\u53c9\u6811\u7684\u5c42\u5e8f\u904d\u5386<\/h1>\n\n\n\n
              \u5c42\u5e8f\u904d\u5386\u4e00\u4e2a\u4e8c\u53c9\u6811\u3002\u5c31\u662f\u4ece\u5de6\u5230\u53f3\u4e00\u5c42\u4e00\u5c42\u7684\u53bb\u904d\u5386\u4e8c\u53c9\u6811\u3002\u8fd9\u79cd\u904d\u5386\u7684\u65b9\u5f0f\u548c\u6211\u4eec\u4e4b\u524d\u8bb2\u8fc7\u7684\u90fd\u4e0d\u592a\u4e00\u6837\u3002<\/p>\n\n\n\n
              \u9700\u8981\u501f\u7528\u4e00\u4e2a\u8f85\u52a9\u6570\u636e\u7ed3\u6784\u5373\u961f\u5217\u6765\u5b9e\u73b0\uff0c\u961f\u5217\u5148\u8fdb\u5148\u51fa\uff0c\u7b26\u5408\u4e00\u5c42\u4e00\u5c42\u904d\u5386\u7684\u903b\u8f91\uff0c\u800c\u7528\u6808\u5148\u8fdb\u540e\u51fa\u9002\u5408\u6a21\u62df\u6df1\u5ea6\u4f18\u5148\u904d\u5386\u4e5f\u5c31\u662f\u9012\u5f52\u7684\u903b\u8f91\u3002<\/strong><\/p>\n\n\n\n
              \u800c\u8fd9\u79cd\u5c42\u5e8f\u904d\u5386\u65b9\u5f0f\u5c31\u662f\u56fe\u8bba\u4e2d\u7684\u5e7f\u5ea6\u4f18\u5148\u904d\u5386\uff0c\u53ea\u4e0d\u8fc7\u6211\u4eec\u5e94\u7528\u5728\u4e8c\u53c9\u6811\u4e0a\u3002<\/strong><\/p>\n\n\n\n
              \u5c42\u5e8f\u904d\u5386\u5177\u4f53\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n\n\n\n
              class Solution:\n    def levelOrder(self, root: Optional[TreeNode]) -> List[List[int]]:\n        if not root:\n            return []\n        queue = collections.deque([root])\n        res = []\n        while queue:\n            levelSize = len(queue)\n            for _ in range(levelSize):\n                node = queue.popleft()\n                res.append(node.val)\n                if node.left:\n                    queue.append(node.left)\n                if node.right:\n                    queue.append(node.right)\n        return res<\/code><\/pre>\n\n\n\n
              \u603b\u7ed3<\/h1>\n\n\n\n
              \u4eca\u5929\u4e3b\u8981\u662f\u5bf9\u4e8c\u53c9\u6811\u7684\u57fa\u7840\u6982\u5ff5\u8fdb\u884c\u4e86\u89e3\uff0c\u9996\u5148\u6839\u636e\u904d\u5386\u65b9\u5f0f\u5206\u4e3a\u6df1\u5ea6\u4f18\u5148\u904d\u5386DFS\u548c\u5e7f\u5ea6\u4f18\u5148\u904d\u5386BFS\uff0c\u518d\u5f80\u4e0b\u8fdb\u4e00\u6b65\u7ec6\u5206\u51fa\u524d\u4e2d\u540e\u5e8f\u904d\u5386\u548c\u5c42\u5e8f\u904d\u5386\u3002\u66f4\u8fdb\u4e00\u6b65\uff0c\u5bf9\u4e8c\u53c9\u6811\u8fdb\u884c\u904d\u5386\u53c8\u6709\u9012\u5f52\u904d\u5386\u548c\u8fed\u4ee3\u904d\u5386\u4e24\u79cd\uff0c\u9012\u5f52\u548c\u8fed\u4ee3\u90fd\u80fd\u7528\u4e8e\u524d\u4e2d\u540e\u5e8f\u904d\u5386\uff0c\u5c42\u5e8f\u904d\u5386\u4e3b\u8981\u4f7f\u7528\u8fed\u4ee3\u904d\u5386\u3002<\/p>\n\n\n\n
              <\/p>\n","protected":false},"excerpt":{"rendered":"
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