Meeting Room Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all meetings. For example,Given [[0, 30],[5, 10],[15, 20]],return false. 分析: 即判断这些区间是否有重叠,遍历一遍…

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all meetings. For example, Given [[0, 30],[5, 10],[15, 20]], return false. 这题和求解有多少架飞机在空中一样. public class S…

Meeting Rooms Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all meetings. For example,Given [[0, 30],[5, 10],[15, 20]],return false. /** * Definition for…

Paint House There are a row of n houses, each house can be painted with one of the three colors: red, blue or green. The cost of painting each house with a certain color is different. You have to paint all the houses such that no two adjacent houses…

Flip Game I You are playing the following Flip Game with your friend: Given a string that contains only these two characters:+and -, you and your friend take turns to flip two consecutive "++" into "--". The game ends when a person can…

Palindrome Permutation I Given a string, determine if a permutation of the string could form a palindrome. For example,"code" -> False, "aab" -> True, "carerac" -> True. Hint: Consider the palindromes of odd vs even…

Meeting Rooms I/II 要点:这题和skyline类似,利用了interval start有序的特点,从左向右处理,用一个heap来动态表示当前占用rooms的时间段,所以heap的size就是room数.具体来说, heap是end time的min heap 当前?就是和新interval同时使用room的情况 如果min end<=新的interval.start,那么同一房间可以被这个interval重用.同时所有heap中end小的都要pop 如果min end>新的i…

sql语句优化总结 数据库优化的几个原则: 1.尽量避免在列上做运算,这样会导致索引失败: 2.使用join是应该用小结果集驱动大结果集,同时把复杂的join查询拆分成多个query.不然join的越多表,就会导致越多的锁定和堵塞. 3.注意like模糊查询的使用,避免使用%%,例如select * from a where name like '%de%'; 代替语句:select * from a where name >= 'de' and name < 'df'; 4.仅列出需要查询的…

0x01 :Scrum Meeting基本摘要 Beta阶段第二次Scrum Meeting 敏捷开发起始时间 2015/12/13 00:00 A.M. 敏捷开发终止时间 2015/12/14 22:00 P.M. 会议基本内容摘要 ü  在后端方面,统一后端逻辑框架,抛弃此前XML格式数据向JSON数据的转化或兼容想法,全部通过Django框架进行后端逻辑的书写,而赵庶宏同学则重点学习Django框架后改写历史的java文件即可 ü  在前端方面,此段时间Scrum开发陷入迟滞,一方面在于j…

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), find the minimum number of conference rooms required. For example,Given [[0, 30],[5, 10],[15, 20]],return 2. 这道题是之前那道Meeting Rooms的拓展,那道题只让我们是…