引言 首先介绍下什么是凸包?如下图: 在一个二维坐标系中,有若干点杂乱排列着,将最外层的点连接起来构成的凸多边型,它能包含给定的所有的点,这个多边形就是凸包. 实际上可以理解为用一个橡皮筋包含住所有给定点的形态. 凸包用最小的周长围住了给定的所有点.如果一个凹多边形围住了所有的点,它的周长一定不是最小,如下图.根据三角不等式,凸多边形在周长上一定是最优的. 凸包的求法 寻找凸包的算法有很多种,常用的求法有 Graham 扫描法和 Andrew 算法 Graham Scan 算法求凸包 Graha
3D Convex Hull Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1266 Accepted Submission(s): 658 Problem Description There are N points in 3D-space which make up a 3D-Convex hull*. How many f
http://acm.hdu.edu.cn/showproblem.php?pid=4273 Rescue Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 337 Accepted Submission(s): 243 Problem Description I work at NASA outer space rescue te
http://acm.hdu.edu.cn/showproblem.php?pid=4266 The Worm in the Apple Time Limit: 50000/20000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 547 Accepted Submission(s): 252 Problem Description Willy the Worm was
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4573 Problem Description Remember our childhood? A few naked children throw stones standing on the same position, the one throws farther win the game. Aha, of course, there are some naughty boys who care
Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 4628 Accepted: 1434 Description The DIY Furniture company specializes in assemble-it-yourself furniture kits. Typically, the pieces of wood are attached to one another using a wooden peg
Ultimate Weapon Time Limit: 2000MS Memory Limit: 131072K Total Submissions: 2074 Accepted: 989 Description In year 2008 of the Cosmic Calendar, the Aliens send a huge armada towards the Earth seeking after conquest. The humans now depend on their
/* *JS时间戳比较大小:对于一组时间戳(开始时间~结束时间)和另一组时间戳进行比较,用于判断被比较时间戳组是否在要求范围内 *@param date1 date2(形如:'2015-01-01'类型字符串) */ function compareDate(date1,date2){ //对获得的时间戳区间与既定的时间戳进行比对 var baseDate1='2015-01-01'; var baseDate2='2015-03-31'; baseDate1=new Date(baseDate