摘要：
You want to build a house on an empty land which reaches all buildings in the shortest amount of distance. You can only move up, down, left and right. 阅读全文
摘要：
Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two 阅读全文
摘要：
Given a list of directory info including directory path, and all the files with contents in this directory, you need to find out all the groups of dup 阅读全文
摘要：
Two strings X and Y are similar if we can swap two letters (in different positions) of X, so that it equals Y. For example, "tars" and "rats" are simi 阅读全文
摘要：
Given many words, words[i] has weight i. Design a class WordFilter that supports one function, WordFilter.f(String prefix, String suffix). It will ret 阅读全文
摘要：
Design a hit counter which counts the number of hits received in the past 5 minutes. Each function accepts a timestamp parameter (in seconds granularity) and you may assume that calls are being made ... 阅读全文
摘要：
You are given several logs that each log contains a unique id and timestamp. Timestamp is a string that has the following format: Year:Month:Day:Hour: 阅读全文
摘要：
Given a collection of intervals, find the minimum number of intervals you need to remove to make the rest of the intervals non-overlapping. Note: You 阅读全文
摘要：
There are a number of spherical balloons spread in two-dimensional space. For each balloon, provided input is the start and end coordinates of the hor 阅读全文
摘要：
Example : Infix : (A+B) * (C-D) ) Postfix: AB+CD-* 算法： 1. Scan the infix expression from left to right. 2. If the scanned character is an operand, app 阅读全文