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151. Reverse Words in a String Given an input string, reverse the string word by word. For example,Given s = "the sky is blue",return "blue is sky the 阅读全文
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96. Unique Binary Search Trees Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example,Given n = 3, the 阅读全文
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201. Bitwise AND of Numbers Range Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive 阅读全文
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221. Maximal Square Given a 2D binary matrix filled with 0's and 1's, find the largest square containing only 1's and return its area. For example, gi 阅读全文
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376. Wiggle Subsequence A sequence of numbers is called a wiggle sequence if the differences between successive numbers strictly alternate between pos 阅读全文
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331. Verify Preorder Serialization of a Binary Tree One way to serialize a binary tree is to use pre-order traversal. When we encounter a non-null nod 阅读全文
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127. Word Ladder Given two words (beginWord and endWord), and a dictionary's word list, find the length of shortest transformation sequence from begin 阅读全文
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365. Water and Jug Problem You are given two jugs with capacities x and y litres. There is an infinite amount of water supply available. You need to d 阅读全文
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355. Design Twitter Design a simplified version of Twitter where users can post tweets, follow/unfollow another user and is able to see the 10 most re 阅读全文
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93. Restore IP Addresses Given a string containing only digits, restore it by returning all possible valid IP address combinations. For example:Given 阅读全文