Sheryl Wang - 博客园

Pow(x, n)

摘要： Implement pow(x, n) 这题用二分做，思路很明确，但是具体怎么做很有trick. 首先是n可能为INT_MIN ，如果将n直接取绝对值，则会溢出，另外，此时直接求分母，最后再求倒数，也可能在求分母的过程中溢出．所以比较好的办法每次需要乘元素的时候乘以1/x(n<0)时．大坑：py 阅读全文

posted @ 2016-08-17 11:45 Sheryl Wang 阅读(183) 评论(0) 推荐(0) 编辑

Insertion Sort List

摘要： Sort a linked list using insertion sort. 这道题目要求插入排序，插入排序的做法的正常做法是，对于当前要处理的数字，朝前查找在已排序数组中的位置. 对于单向链表而言，无法朝前走，所以一个替换的选择是从头朝后走．直到后面的节点值大于当前处理的节点．值得注意的有两阅读全文

posted @ 2016-08-16 20:29 Sheryl Wang 阅读(116) 评论(0) 推荐(0) 编辑

Word Break II

摘要： Given a string s and a dictionary of words dict, add spaces in s to construct a sentence where each word is a valid dictionary word. Return all such p 阅读全文

posted @ 2016-08-15 21:48 Sheryl Wang 阅读(180) 评论(0) 推荐(0) 编辑

Decode Ways

摘要： A message containing letters from A-Z is being encoded to numbers using the following mapping: Given an encoded message containing digits, determine t 阅读全文

posted @ 2016-08-15 15:25 Sheryl Wang 阅读(118) 评论(0) 推荐(0) 编辑

Substring with Concatenation of All Words I

摘要：如题，这题需要思考的是复杂度阅读全文

posted @ 2016-08-15 11:19 Sheryl Wang 阅读(111) 评论(0) 推荐(0) 编辑

Generate Parentheses

摘要： Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n = 3, a solution set is: 这阅读全文

posted @ 2016-08-12 14:16 Sheryl Wang 阅读(123) 评论(0) 推荐(0) 编辑

Letter Combinations of a Phone Number

摘要： Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telepho 阅读全文

posted @ 2016-08-12 10:33 Sheryl Wang 阅读(151) 评论(0) 推荐(0) 编辑

SubTree

摘要： You have two every large binary trees: T1, with millions of nodes, and T2, with hundreds of nodes. Create an algorithm to decide if T2 is a subtree of 阅读全文

posted @ 2016-08-07 17:33 Sheryl Wang 阅读(148) 评论(0) 推荐(0) 编辑

Odd Even Linked List

摘要： Given a singly linked list, group all odd nodes together followed by the even nodes. Please note here we are talking about the node number and not the 阅读全文

posted @ 2016-08-07 11:18 Sheryl Wang 阅读(121) 评论(0) 推荐(0) 编辑

Partition Array by Odd and Even

摘要： Partition an integers array into odd number first and even number second. 剑指offer的一道题，把所有奇数移动到偶数前面，其实是partition的双端解法，利用双指针。先检测两边合格的元素，都不合格，则交换，继续。需要注阅读全文

posted @ 2016-08-07 11:03 Sheryl Wang 阅读(191) 评论(0) 推荐(0) 编辑