摘要： Description:Given a binary tree, return thezigzag level ordertraversal of its nodes' values. (ie, from left to right, then right to left for the next ... 阅读全文

摘要： Description:Given a linked list and a valuex, partition it such that all nodes less thanxcome before nodes greater than or equal tox.You should preser... 阅读全文

摘要： Description:The count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, ...1is read off as"one 1"or11.11is re... 阅读全文

摘要： Decription:Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.For example, gi... 阅读全文

摘要： Subsets Description:Given a set of distinct integers,S, return all possible subsets.Note:Elements in a subset must be in non-descending order.The solu... 阅读全文

摘要： Description :Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST.分析：这道题目简单版是把一个排序好的数组转成平衡的二叉树... 阅读全文

摘要： Unique Binary Search TreesGivenn, how many structurally uniqueBST's(binary search trees) that store values 1...n?For example,Givenn= 3, there are a to... 阅读全文

摘要： 一次总结两道题，两道题目都比较基础Description:Write a function to find the longest common prefix string amongst an array of strings.分析： 这道题目最重要的知道什么叫prefix前缀， 否则一不小心就做... 阅读全文

摘要： Description:Given a binary tree, flatten it to a linked list in-place.For example,Given 1 / \ 2 5 / \ \ 3 4 6The... 阅读全文

摘要： Description:Given an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the array represents... 阅读全文