题目链接:https://vjudge.net/problem/POJ-1113 Wall Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 39281   Accepted: 13418 Description Once upon a time there was a greedy King who ordered his chief Architect to build a wall around the King's…

题意: 给你一个由n个点构成的多边形城堡(看成二维),按顺序给你n个点,相邻两个点相连. 让你围着这个多边形城堡建一个围墙,城堡任意一点到围墙的距离要求大于等于L,让你求这个围墙的最小周长(看成二维平面)(结果四舍五入 分析: 凸包问题和这个问题的差别就在于:凸包问题没有"城堡任意一点到围墙的距离要求大于等于L"这个要求 凸包:找到一个凸多边形把这n个点形成的多边形围起来,找到的那个周长最小的凸多边形就是我们所求的凸包 那么这个问题怎么在凸包的基础上解决呢? 我们考虑L,对于求出的凸多…

Once upon a time there was a greedy King who ordered his chief Architect to build a wall around the King's castle. The King was so greedy, that he would not listen to his Architect's proposals to build a beautiful brick wall with a perfect shape and…

题目大意:建立围墙将城堡围起来,要求围墙至少距离城堡L,拐角处用圆弧取代,求围墙的长度. 题目思路:围墙长度=凸包周长+(2*PI*L),另外不知道为什么C++poj会RE,G++就没问题. #include<cstdio> #include<cstdlib> #include<cmath> #include<iostream> #include<algorithm> #include<cstring> #include<vec…

题目来源:http://poj.org/problem?id=1113题目大意: 如图所示,给定N个顶点构成的一个多边形和一个距离值L.建立一个围墙,把这个多边形完全包含在内,且围墙距离多边形任一点的距离不超过指定的距离L.求出满足条件的围墙长度最小值. 输入:第一行为N和L.3 <= N <= 1000, 1 <= L <= 1000.接下来N行每行两个整数代表一个点的坐标,(-10000 <= Xi, Yi <= 10000) ,每个点都不重合,输入保证了多边形的每…

Description Once upon a time there was a greedy King who ordered his chief Architect to build a wall around the King's castle. The King was so greedy, that he would not listen to his Architect's proposals to build a beautiful brick wall with a perfec…

题目链接:https://cn.vjudge.net/problem/POJ-1113 题意 给一些点,求一个能够包围所有点且每个点到边界的距离不下于L的周长最小图形的周长 思路 求得凸包的周长,再加上一个半径为L的圆的周长 提交过程 CE 注意某些OJ上cmath库里没有M_PI AC 代码 #define PI 3.1415926 #include <cmath> #include <cstdio> #include <vector> #include <al…

题意: 求把城堡围起来需要的最小墙壁周长. 思路: 围墙周长为=n条平行于凸包的线段+n条圆弧的长度=凸包周长+围墙离城堡距离L为半径的圆周长. 代码: ...还是看大佬写的,自己做个记录方便日后复习.. #include <iostream> #include <cstdio> #include <algorithm> #include <cmath> #include <cstring> using namespace std; ; cons…

此题为凸包问题模板题,题目中所给点均为整点,考虑到数据范围问题求norm()时先转换成double了,把norm()那句改成<vector>压栈即可求得凸包. 初次提交被坑得很惨,在GDB中可以完美运行A掉,到OJ上就频频RE(此处应有黑人问号) 后来发现了问题,原因是玩杂耍写了这样的代码 struct point { int x, y; point (){ scanf("%d%d", &x, &y); } ... }pt[MAXN]; 于是乎,在swap…

Wall Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 3139    Accepted Submission(s): 888 Problem Description Once upon a time there was a greedy King who ordered his chief Architect to build a w…