北叶青藤

2016年7月23日

Power of Two & Power of Three & Power of Four

摘要： Check Power of 2 Using O(1) time to check whether an integer n is a power of 2. Check Power of 2 Using O(1) time to check whether an integer n is a po 阅读全文

posted @ 2016-07-23 02:59 北叶青藤阅读(195) 评论(0) 推荐(0) 编辑

10. Regular Expression Matching & Wildcard Matching

摘要： Regular Expression Matching Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or 阅读全文

posted @ 2016-07-23 02:51 北叶青藤阅读(206) 评论(0) 推荐(0) 编辑

2016年7月22日

33. Search in Rotated Sorted Array I & II

摘要： Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). You are given a target va 阅读全文

posted @ 2016-07-22 10:59 北叶青藤阅读(166) 评论(0) 推荐(0) 编辑

Topological Sorting

摘要： Given an directed graph, a topological order of the graph nodes is defined as follow: For each directed edge A -> B in graph, A must before B in the o 阅读全文

posted @ 2016-07-22 09:56 北叶青藤阅读(193) 评论(0) 推荐(0) 编辑

Expression Tree Build

摘要： The structure of Expression Tree is a binary tree to evaluate certain expressions.All leaves of the Expression Tree have an number string value. All n 阅读全文

posted @ 2016-07-22 07:53 北叶青藤阅读(446) 评论(0) 推荐(0) 编辑

Create Maximum Number

摘要： Given two arrays of length m and n with digits 0-9 representing two numbers. Create the maximum number of length k <= m + n from digits of the two. Th 阅读全文

posted @ 2016-07-22 04:15 北叶青藤阅读(233) 评论(0) 推荐(0) 编辑

341. Flatten Nested List Iterator

摘要： Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list -- whose elements may also be integ 阅读全文

posted @ 2016-07-22 00:28 北叶青藤阅读(208) 评论(0) 推荐(0) 编辑

2016年7月21日

Scramble String

摘要： Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively. Below is one possible representati 阅读全文

posted @ 2016-07-21 23:00 北叶青藤阅读(224) 评论(0) 推荐(0) 编辑

Binary Representation

摘要： Given a (decimal - e.g. 3.72) number that is passed in as a string, return the binary representation that is passed in as a string. If the fractional 阅读全文

posted @ 2016-07-21 13:29 北叶青藤阅读(253) 评论(0) 推荐(0) 编辑

Convert Expression to Reverse Polish Notation

摘要： Given an expression string array, return the Reverse Polish notation of this expression. (remove the parentheses) Given an expression string array, re 阅读全文

posted @ 2016-07-21 11:52 北叶青藤阅读(299) 评论(0) 推荐(0) 编辑

公告