Sheryl Wang - 博客园

Sqrt(x)

摘要： Implement int sqrt(int x). Compute and return the square root of x. 求一个数的开方，binary search on result 二分结果的典型。对于0和1直接返回1。后面的left ＝ 1 ，right 为 x/2。代码如下：阅读全文

posted @ 2016-05-15 22:08 Sheryl Wang 阅读(191) 评论(0) 推荐(0)

Lowest Common Ancestor of a Binary Tree

摘要： Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowes 阅读全文

posted @ 2016-05-15 17:05 Sheryl Wang 阅读(202) 评论(0) 推荐(0)

First Bad Version

摘要： You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quality c 阅读全文

posted @ 2016-05-14 22:04 Sheryl Wang 阅读(178) 评论(0) 推荐(0)

Search for a Range

摘要： Given a sorted array of integers, find the starting and ending position of a given target value. Your algorithm's runtime complexity must be in the or 阅读全文

posted @ 2016-05-14 21:54 Sheryl Wang 阅读(137) 评论(0) 推荐(0)

Find in Large Sorted Array

摘要： http://www.lintcode.com/zh-cn/problem/search-in-a-big-sorted-array/ 给一个按照升序排序的正整数数组。这个数组很大以至于你只能通过固定的接口 ArrayReader.get(k) 来访问第k个数。(或者C++里是ArrayReade 阅读全文

posted @ 2016-05-14 21:26 Sheryl Wang 阅读(243) 评论(0) 推荐(0)

Search a 2D Matrix

摘要： Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers in each row are sorted f 阅读全文

posted @ 2016-05-13 11:59 Sheryl Wang 阅读(136) 评论(0) 推荐(0)

Search Insert Position

摘要： Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in or 阅读全文

posted @ 2016-05-12 22:46 Sheryl Wang 阅读(129) 评论(0) 推荐(0)

Validate Binary Search Tree

摘要： Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains only 阅读全文

posted @ 2016-05-12 10:36 Sheryl Wang 阅读(157) 评论(0) 推荐(0)

Populating Next Right Pointers in Each Node II

摘要： Follow up for problem "Populating Next Right Pointers in Each Node". What if the given tree could be any binary tree? Would your previous solution sti 阅读全文

posted @ 2016-05-11 21:47 Sheryl Wang 阅读(163) 评论(0) 推荐(0)

Populating Next Right Pointers in Each Node

摘要： Given a binary tree Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be set to NULL 阅读全文

posted @ 2016-05-11 17:18 Sheryl Wang 阅读(134) 评论(0) 推荐(0)