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Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains only 阅读全文
posted @ 2016-07-08 10:29
北叶青藤
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Given a binary tree, find the maximum path sum. The path may start and end at any node in the tree. Example Given the below binary tree: 1 / \ 2 3 ret 阅读全文
posted @ 2016-07-08 10:19
北叶青藤
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Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers along its path. 阅读全文
posted @ 2016-07-08 05:14
北叶青藤
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Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree is defined as a binary tree in which the dept 阅读全文
posted @ 2016-07-08 04:05
北叶青藤
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Given the root and two nodes in a Binary Tree. Find the lowest common ancestor(LCA) of the two nodes. The lowest common ancestor is the node with larg 阅读全文
posted @ 2016-07-08 02:55
北叶青藤
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Design an iterator over a binary search tree with the following rules: Elements are visited in ascending order (i.e. an in-order traversal) next() and 阅读全文
posted @ 2016-07-08 02:39
北叶青藤
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Given a sequence of integers, find the longest increasing subsequence (LIS). You code should return the length of the LIS. Clarification What's the de 阅读全文
posted @ 2016-07-08 00:58
北叶青藤
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Given inorder and postorder traversal of a tree, construct the binary tree. Notice You may assume that duplicates do not exist in the tree. Given inor 阅读全文
posted @ 2016-07-08 00:21
北叶青藤
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