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A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null. Return a deep copy 阅读全文
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There are N gas stations along a circular route, where the amount of gas at station i is gas[i]. You have a car with an unlimited gas tank and it cost 阅读全文
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Given a string s, partition s such that every substring of the partition is a palindrome. Return all possible palindrome partitioning of s. For exampl 阅读全文
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Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 阅读全文
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Implement int sqrt(int x). Compute and return the square root of x. 方法一：牛顿迭代 f(x)=f(x0)+f'(x0)(x-x0) >x=x0-f(x0)/f'(x0) 在此处f(x)=x^2-n, f'(x)=2x,代入并整理得 阅读全文
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Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order. For example,Given the following matrix: You s 阅读全文
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Implement pow(x, n). 阅读全文
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Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacen 阅读全文
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Given a string array words, find the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. You may assum 阅读全文
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描述 那是木姑娘十七岁时，我送给她的生日礼物。（后来手链也成为了我最喜欢的出题媒介） 记得最初买的手链，由n段紫色的珠子构成，每一颗珠子都被赋予了一种价值评价w[i]。 为了木姑娘，我只惋惜自己不能摘下漫天繁星送给她。 不过我并没有将整个手链都送出去，木姑娘的手腕是纤细的。我只需要截取一个子段就可以 阅读全文