{"id":2503,"date":"2022-02-02T13:58:47","date_gmt":"2022-02-02T05:58:47","guid":{"rendered":"http:\/\/139.9.1.231\/?p=2503"},"modified":"2022-02-02T13:58:47","modified_gmt":"2022-02-02T05:58:47","slug":"leetcodeday144","status":"publish","type":"post","link":"http:\/\/139.9.1.231\/index.php\/2022\/02\/02\/leetcodeday144\/","title":{"rendered":"leetcodeday144 &#8211; \u4e8c\u53c9\u6811\u7684\u524d\u5e8f\u904d\u5386"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code># @lc app=leetcode.cn id=144 lang=python3\r\n#\r\n# &#91;144] \u4e8c\u53c9\u6811\u7684\u524d\u5e8f\u904d\u5386\r\n#\r\n\r\n# @lc code=start\r\n# Definition for a binary tree node.\r\n# class TreeNode:\r\n#     def __init__(self, val=0, left=None, right=None):\r\n#         self.val = val\r\n#         self.left = left\r\n#         self.right = right\r\nclass Solution:\r\n    def preorderTraversal(self, root: Optional&#91;TreeNode]) -> List&#91;int]:\r\n        # \u4fdd\u5b58\u7ed3\u679c\r\n        result = &#91;]\r\n        \r\n        def traversal(root: TreeNode):\r\n            if root == None:\r\n                return\r\n            result.append(root.val) # \u524d\u5e8f\r\n            traversal(root.left)    # \u5de6\r\n            traversal(root.right)   # \u53f3\r\n\r\n        traversal(root)\r\n        return result\r\n# @lc code=end\r\n<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-style-default\"><img loading=\"lazy\" width=\"794\" height=\"232\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/02\/image-2.png\" alt=\"\" class=\"wp-image-2505\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/02\/image-2.png 794w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/02\/image-2-300x88.png 300w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/02\/image-2-768x224.png 768w\" sizes=\"(max-width: 794px) 100vw, 794px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[],"_links":{"self":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/2503"}],"collection":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/comments?post=2503"}],"version-history":[{"count":2,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/2503\/revisions"}],"predecessor-version":[{"id":2506,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/2503\/revisions\/2506"}],"wp:attachment":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/media?parent=2503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/categories?post=2503"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/tags?post=2503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}