摘要：
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
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Given n items with size Ai and value Vi, and a backpack with size m. What's the maximum value can you put into the backpack? Given 4 items with size [ 阅读全文
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Given n items with size Ai, an integer m denotes the size of a backpack. How full you can fill this backpack? If we have 4 items with size [2, 3, 5, 7 阅读全文
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Given an array of strings, return all groups of strings that are anagrams. Given ["lint", "intl", "inlt", "code"], return["lint", "inlt", "intl"]. Giv 阅读全文
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Design a data structure that supports the following two operations: addWord(word) and search(word) search(word) can search a literal word or a regular 阅读全文