摘要：
Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4]. Not 阅读全文
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Find the total area covered by two rectilinear rectangles in a 2D plane. Each rectangle is defined by its bottom left corner and top right corner as s 阅读全文
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Given a 2D board and a list of words from the dictionary, find all words in the board. Each word must be constructed from letters of sequentially adja 阅读全文
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Convert a non-negative integer to its english words representation. Given input is guaranteed to be less than 231 - 1. For example, 123 -> "One Hundre 阅读全文
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Design and implement a TwoSum class. It should support the following operations: add and find. add - Add the number to an internal data structure. fin 阅读全文
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Design a data structure that supports the following two operations: search(word) can search a literal word or a regular expression string containing o 阅读全文