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题目： The count-and-say sequence is the sequence of integers with the first five terms as following: count-and-say序列是整数序列，前五个术语如下： 1 is read off as "one 阅读全文
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题目： In a row of seats, 1 represents a person sitting in that seat, and 0 represents that the seat is empty. 在一排座位中，1表示坐在该座位上的人，0表示座位是空的。 There is at l 阅读全文
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题目： Given a binary search tree (BST) with duplicates, find all the mode(s) (the most frequently occurred element) in the given BST. 给定具有重复项的二叉搜索树（BST） 阅读全文
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题目： Given an array consisting of n integers, find the contiguous subarray of given length k that has the maximum average value. And you need to output 阅读全文
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题目： Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. 确定整数是否是回文。 当它向前读取向后时，整数是回文。 E 阅读全文
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题目： Given a non-empty string check if it can be constructed by taking a substring of it and appending multiple copies of the substring together. You m 阅读全文
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题目： Given an array of integers, return indices of the two numbers such that they add up to a specific target. 给定一个整数数组，返回两个数字的索引，使它们相加到特定目标。 You may a 阅读全文
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题目： Given a binary tree, determine if it is height-balanced. 给定二叉树，确定它是否是高度平衡的。 For this problem, a height-balanced binary tree is defined as: 对于此问题，高 阅读全文
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题目： Implement the following operations of a queue using stacks. 使用堆栈实现队列的以下操作。 push(x) -- Push element x to the back of queue. 将元素x推送到队列的后面。 pop() -- 阅读全文
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1.数据结构分类 （1）线性结构 数组，栈，队列，链表，哈希表 （2）树结构 二叉树，二分搜索树，AVL，红黑树，Treap，Splay，堆，Trie，线段树，K-D树，并查集，哈夫曼树 （3）图结构 邻接矩阵，邻接表 2.数据结构应用 (1)数据库 树结构：AVL,红黑树，Treap，伸展树，B树 阅读全文