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Best Time to Buy and Sell Stock ISay you have an array for which the ith element is the price of a given stock on day i.If you were only permitted to ... 阅读全文
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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.For example:Given the below binary tree, 1 ... 阅读全文
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Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, ... 阅读全文
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Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary).You may assume that the intervals were initial... 阅读全文
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Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.)You have t... 阅读全文
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Given two words (start and end), and a dictionary, find the length of shortest transformation sequence from start to end, such that:Only one letter ca... 阅读全文
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平常在实验室上班，周末老板如果又给个邮件就让我一个周末也没了。这周决定白天一定要出去玩玩，不然宅在宿舍想着老板出的问题也过得太过悲催。昨晚刷完攻略后决定去赤柱。期待的是无敌海景还有沙滩比基尼。攻略上都说吃的贵，作为极品ds也就准备傍晚回来再吃。早上10点左右出发，到达中环再坐260去。坐大巴比坐地铁... 阅读全文
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Given an unsorted array of integers, find the length of the longest consecutive elements sequence.For example,Given [100, 4, 200, 1, 3, 2],The longest... 阅读全文
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Mergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity.想法很简单，就是两两合并。在Merge Two Sorted Lists这道题已经实现了两两合并的代码了，就... 阅读全文
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Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number.An example is the root-to-leaf path 1->2->3 which... 阅读全文