思路:裸的DLX重复覆盖 #include<set> #include<cmath> #include<queue> #include<cstdio> #include<vector> #include<string> #include<cstdlib> #include<cstring> #include<iostream> #include<algorithm> #define pb…

Description N cities of the Java Kingdom need to be covered by radars for being in a state of war. Since the kingdom has M radar stations but only K operators, we can at most operate K radars. All radars have the same circular coverage with a radius…

题目大意: 有一堆雷达工作站,安放至多k个人在这些工作站中,找到一个最小的雷达监控半径可以使k个工作人所在的雷达工作站覆盖所有城市 二分半径的答案,每次利用dlx的重复覆盖来判断这个答案是否正确 #include <iostream> #include <cstring> #include <cstdio> #include <algorithm> #include <queue> #include <climits> #includ…

Radar Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3684    Accepted Submission(s): 1398 Problem Description N cities of the Java Kingdom need to be covered by radars for being in a state of w…

2分答案+DLX判断可行 不使用的估计函数的可重复覆盖的搜索树将十分庞大 #include <iostream> #include <cstring> #include <cstdio> #include <cmath> #include <vector> using namespace std; #define FOR(i,A,s) for(int i = A[s]; i != s; i = A[i]) #define exp 1e-8 , M…

Radar Problem Description N cities of the Java Kingdom need to be covered by radars for being in a state of war. Since the kingdom has M radar stations but only K operators, we can at most operate K radars. All radars have the same circular coverage…

题意: N个城市,M个雷达站,K个操作员,问雷达的半径至少为多大,才能覆盖所有城市.M个雷达中最多只能有K个同时工作. 思路: 二分雷达的半径,看每个雷达可以覆盖哪些城市,然后做重复覆盖,判断这个半径是否可行. 我是直接二分的半径,跑了300+ms,看了Virtual Judge上面跑得快的代码,才发现为了不浪费半径的长度,最小的半径一定等于某一个雷达站到某一个城市之间的距离.这样一来枚举量就小了很多,只需要15ms…… 代码: 300+ms的 -_- #include <iostream>…

Radar Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2882    Accepted Submission(s): 1113 Problem Description N cities of the Java Kingdom need to be covered by radars for being in a state of w…

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…

http://blog.csdn.net/sr_19930829/article/details/39756513 http://www.kuangbin.net/archives/hdu4069-dlx http://acm.hdu.edu.cn/showproblem.php?pid=3909 还是不会DLX哎= = 这题先放着吧…