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HDU2295 Radar —— Dancing Links 可重复覆盖

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2295 Radar Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4106    Accepted Submission(s): 1576 Problem Description N cities of the Java Kingdom n…

HDU2295 Radar (DLX)

下面的代码99%参考了这个网站http://www.cnblogs.com/183zyz/archive/2011/08/07/2130193.html 人生的第一道DLX肯定是需要作一些参考的啦. 题意:给你N个城市,M个雷达,你要在其中选K个,问当半径最小是多少的时候可以覆盖到所有的N个城市. 做法:二分所需要的半径r,然后处理出这时雷达能够覆盖到哪些位置.然后就转化成了一个重复覆盖问题,跑一下DLX即可. 花了两天的时间学习了一下DLX这种神奇的数据结构,它在解决精确覆盖问题上尤其有帮助,…

Dancing Links 专题总结

算法详细:Dancing Links博客 1.精确覆盖: ZOJ3209 Treasure Map HUST1017 Exact cover POJ3074 Sudoku 2.可重复覆盖: HDU2295 Radar FZU1686 神龙的难题…

HDU 2295 Radar （重复覆盖）

Radar Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2280    Accepted Submission(s): 897 Problem Description N cities of the Java Kingdom need to be covered by radars for being in a state of wa…

GNU Radio Radar Toolbox

GNU Radio Radar Toolbox Install guide Change to any folder in your home directory and enter following commands in your terminal. git clone https://github.com/kit-cel/gr-radar.git // clone this repository cd gr-radar/ mkdir build // make build folder…

radar js

<!doctype html> <html> <head> <meta charset="utf-8"> <link href="style.css" rel="stylesheet" type="text/css"> <title></title> </head> <body> <canvas id="…

[POJ1328]Radar Installation

[POJ1328]Radar Installation 试题描述 Assume the coasting is an infinite straight line. Land is in one side of coasting, sea in the other. Each small island is a point locating in the sea side. And any radar installation, locating on the coasting, can onl…

Radar Installation

Radar Installation 题目链接:http://acm.hust.edu.cn/vjudge/contest/view.action?cid=86640#problem/C 题目: Description   Assume the coasting is an infinite straight line. Land is in one side of coasting, sea in the other. Each small island is a point locating…

Radar Installation(贪心）

Radar Installation Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 56826   Accepted: 12814 Description Assume the coasting is an infinite straight line. Land is in one side of coasting, sea in the other. Each small island is a point loca…

贪心 POJ 1328 Radar Installation

题目地址:http://poj.org/problem?id=1328 /* 贪心 (转载)题意:有一条海岸线,在海岸线上方是大海,海中有一些岛屿, 这些岛的位置已知,海岸线上有雷达,雷达的覆盖半径知道, 问最少需要多少个雷达覆盖所有的岛屿. (错误)思路:我开始是想从最左边的点雷达能探测的到的最右的位置出发,判断右边其余的点是否与该点距离小于d 是,岛屿数-1:不是,雷达数+1,继续... (正确)思路:每个岛屿的座标已知,以雷达半径为半径画圆,与x轴有两个交点. 也就是说,若要覆盖该岛,雷达…