{"id":2520,"date":"2022-02-02T15:13:54","date_gmt":"2022-02-02T07:13:54","guid":{"rendered":"http:\/\/139.9.1.231\/?p=2520"},"modified":"2022-02-02T15:13:55","modified_gmt":"2022-02-02T07:13:55","slug":"leetcodeday637","status":"publish","type":"post","link":"http:\/\/139.9.1.231\/index.php\/2022\/02\/02\/leetcodeday637\/","title":{"rendered":"leetcodeday637&#8211;\u4e8c\u53c9\u6811\u7684\u5c42\u5e73\u5747\u503c"},"content":{"rendered":"\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u975e\u7a7a\u4e8c\u53c9\u6811\u7684\u6839\u8282\u70b9&nbsp;<code>root<\/code>&nbsp;, \u4ee5\u6570\u7ec4\u7684\u5f62\u5f0f\u8fd4\u56de\u6bcf\u4e00\u5c42\u8282\u70b9\u7684\u5e73\u5747\u503c\u3002\u4e0e\u5b9e\u9645\u7b54\u6848\u76f8\u5dee&nbsp;<code>10<sup>-5<\/sup><\/code>&nbsp;\u4ee5\u5185\u7684\u7b54\u6848\u53ef\u4ee5\u88ab\u63a5\u53d7\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># @lc app=leetcode.cn id=637 lang=python3\n#\n# &#91;637] \u4e8c\u53c9\u6811\u7684\u5c42\u5e73\u5747\u503c\n#\n\n# @lc code=start\n# 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 averageOfLevels(self, root: Optional&#91;TreeNode]) -&gt; List&#91;float]:\n        if not root: return &#91;] #\u6ce8\u610f\u7279\u6b8a\u60c5\u51b5\uff1a\u6811\u4e3a\u7a7a\u8fd4\u56de&#91;]\n        queue = &#91;root]\n        list1 = &#91;]\n        while queue:\n            list2 = 0\n            lens=len(queue)\n            for i in range(lens):\n                a = queue.pop(0)#\u5143\u7d20\u51fa\u961f\u5217\n                if a.left :\n                    queue.append(a.left)    \n                if a.right:\n                    queue.append(a.right)        \n                list2=list2+a.val\n            \n            list1.append(list2\/lens)\n        return list1\n# @lc code=end\n\n<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-style-default\"><img loading=\"lazy\" width=\"803\" height=\"220\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/02\/image-6.png\" alt=\"\" class=\"wp-image-2521\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/02\/image-6.png 803w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/02\/image-6-300x82.png 300w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/02\/image-6-768x210.png 768w\" sizes=\"(max-width: 803px) 100vw, 803px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u975e\u7a7a\u4e8c\u53c9\u6811\u7684\u6839\u8282\u70b9&nbsp;root&nbsp;, \u4ee5\u6570\u7ec4\u7684\u5f62\u5f0f\u8fd4\u56de\u6bcf\u4e00\u5c42\u8282\u70b9\u7684\u5e73\u5747\u503c\u3002\u4e0e\u5b9e\u9645\u7b54\u6848\u76f8 &hellip; <a href=\"http:\/\/139.9.1.231\/index.php\/2022\/02\/02\/leetcodeday637\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">leetcodeday637&#8211;\u4e8c\u53c9\u6811\u7684\u5c42\u5e73\u5747\u503c<\/span><\/a><\/p>\n","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\/2520"}],"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=2520"}],"version-history":[{"count":1,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/2520\/revisions"}],"predecessor-version":[{"id":2522,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/2520\/revisions\/2522"}],"wp:attachment":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/media?parent=2520"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/categories?post=2520"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/tags?post=2520"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}