{"id":699,"date":"2020-09-26T11:12:11","date_gmt":"2020-09-26T03:12:11","guid":{"rendered":"http:\/\/39.96.58.60\/?p=699"},"modified":"2022-10-18T16:38:16","modified_gmt":"2022-10-18T08:38:16","slug":"leetcode-404-%e5%b7%a6%e5%8f%b6%e5%ad%90%e4%b9%8b%e5%92%8c","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=699","title":{"rendered":"Leetcode 404. \u5de6\u53f6\u5b50\u4e4b\u548c"},"content":{"rendered":"<p>\u8ba1\u7b97\u7ed9\u5b9a\u4e8c\u53c9\u6811\u7684\u6240\u6709\u5de6\u53f6\u5b50\u4e4b\u548c\u3002<\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>    3\n\n   \/ \\\n\n  9  20\n\n    \/  \\\n\n   15   7\n\n\n\n\u5728\u8fd9\u4e2a\u4e8c\u53c9\u6811\u4e2d\uff0c\u6709\u4e24\u4e2a\u5de6\u53f6\u5b50\uff0c\u5206\u522b\u662f 9 \u548c 15\uff0c\u6240\u4ee5\u8fd4\u56de 24<\/pre>\n<p>&nbsp;<\/p>\n<p>**\u96be\u5ea6**: Easy<\/p>\n<p>**\u6807\u7b7e**: \u6811\u3001<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism undefined-numbers lang-python\" data-lang=\"Python\"><code>\n# -*- coding: utf-8 -*-\n# @Author  : LG\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a36 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8694.98% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a14.1 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8624.06% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u89c1\u4ee3\u7801\u6ce8\u91ca\n\"\"\"\n# Definition for a binary tree node.\n# class TreeNode:\n#     def __init__(self, x):\n#         self.val = x\n#         self.left = None\n#         self.right = None\n\nclass Solution:\n    def sumOfLeftLeaves(self, root: TreeNode) -&gt; int:\n        self.result = 0\n        def find(root):\n            left = root.left    # \u5f53\u524d\u8282\u70b9\u5de6\u5b50\u6811\n            right = root.right  # \u5f53\u524d\u8282\u70b9\u53f3\u5b50\u6811\n            if left:            # \u5982\u679c\u5de6\u5b50\u6811\u4e0d\u4e3aNone\n                if not (left.left or left.right):   # \u5982\u679c\u8be5\u5de6\u5b50\u6811\u662f\u53f6\u8282\u70b9\uff0c\u6dfb\u52a0\u5230\u6700\u7ec8\u7ed3\u679c\u4e2d\n                    self.result += left.val\n                else:\n                    find(left)  # \u5982\u4e0d\u662f\u53f6\u8282\u70b9\uff0c\u5904\u7406\u8be5\u8282\u70b9\n            if right:   # \u5982\u679c\u53f3\u5b50\u68112\u4e0d\u4e3aNone, \u5904\u7406\u8be5\u8282\u70b9\n                find(right)\n        if root:\n            find(root)\n        return self.result<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u8ba1\u7b97\u7ed9\u5b9a\u4e8c\u53c9\u6811\u7684\u6240\u6709\u5de6\u53f6\u5b50\u4e4b\u548c\u3002 \u793a\u4f8b\uff1a 3 \/ \\ 9 20 \/ \\ 15 7 \u5728\u8fd9\u4e2a\u4e8c\u53c9\u6811\u4e2d\uff0c\u6709\u4e24\u4e2a\u5de6\u53f6\u5b50&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":[],"categories":[11,1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/699"}],"collection":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=699"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/699\/revisions"}],"predecessor-version":[{"id":700,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/699\/revisions\/700"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=699"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=699"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=699"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}