{"id":52,"date":"2018-11-12T16:32:58","date_gmt":"2018-11-12T16:32:58","guid":{"rendered":"https:\/\/andybase.com\/?p=52"},"modified":"2018-11-27T14:31:21","modified_gmt":"2018-11-27T14:31:21","slug":"938-range-sum-of-bst","status":"publish","type":"post","link":"https:\/\/andybase.com\/?p=52","title":{"rendered":"938 Range Sum of BST"},"content":{"rendered":"<p>link: <a href=\"https:\/\/leetcode.com\/problems\/range-sum-of-bst\/\">Range Sum of BST <\/a><\/p>\n\n\n<h2 class=\"wp-block-heading\">Thought<\/h2>\n\n\n\n<p>When first saw this question, I think using tree traverse could solve it and it did works.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Code<\/h2>\n\n\n\n<pre class=\"wp-block-syntaxhighlighter-code brush: python; notranslate\"># 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 rangeSumBST(self, root, L, R):\n        \"\"\"\n        :type root: TreeNode\n        :type L: int\n        :type R: int\n        :rtype: int\n        \"\"\"\n        self.res = 0\n        def helper(root): # helper function to traverse tree\n            if not root:\n                return\n            if L &lt;= root.val &lt;= R:\n                self.res += root.val\n                helper(root.left)\n                helper(root.right)\n            elif root.val &lt; L:\n                helper(root.right)\n            else:\n                helper(root.left)\n        helper(root)\n        return self.res<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Runtime<\/h2>\n\n\n\n<p>Time O(n)<br>\nSpace O(n)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>link: Range Sum of BST Thought When first saw this question, I think using tree traverse could solve it and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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