convex hexagon

Question: Give N points on the plane, find a straight line, so that all points in the same side of the straight line, and the average distance to the straight line is as small as possible. First find the convex hull It is easy to know that the optimal straight line must be an edge of a convex hull, and then calculated using the point-to-line distance formula. # Include

Link: nyoj 78 Question: This question is mainly about the usage of convex hull. It is an entry level. Of course, the premise is that you have been in touch with the plane ry: AC code: 1 # include Nyoj 78 ring pool (Entry level convex hull)

way, that it is accurate to 8 inches (1 foot is equal to 12 inches), since the King will not tolerate larger error in the estimates. Sample Input 9 100200 400300 400300 300400 300400 400500 400500 200350 200200 200 Sample output 1628 HintThe result is rounded to the nearest integer. SourceNortheastern Europe 2001: Give you the coordinates of N points in clockwise order, and then give you a length of L N points represent the coordinates of the castle, Require the castle to be at any point to bui

The main idea: building a fence around the castle, requiring the fence at least from the Castle L, the corner with an arc to replace, seeking the length of the fence.Topic idea: fence length = convex hull circumference + (2*pi*l), also do not know why C++POJ will re,g++ no problem.#include #include#include#include#include#include#include#include#defineINF 0x3f3f3f3f#defineMAX 100005#definePI ACOs (-1)using namespacestd;structnode{intx, y;} Point[max];

Simple convex hull + brute force enumeration. /* Geometric Convex Hull + brute force */# include

See the book "algorithm design and analysis" Wang Xiaodong Dynamic Planning 1. problem description (Note: it is the sum of weights of all triangles, not the sum of weights of edges and chords) 2. analysis 3. encoding implementation :/** * @ Author: Hu Jiawei * @ Createtime: 12:31:16 * @ Description: optimal triangular division of a convex polygon. */ PackageEx2; Public ClassTriangulation { Private IntN; // n PolygonPrivate Int[] [] Weight; // edge we

The bipartite method is applicable only to linear functions. It is necessary to divide functions into three points when they are convex or concave when they are separated from linear functions. The trigger process is as follows: Convex Function: Concave function: Implementation Method: double Calc(double p) { /*...*/}double Solve(double MIN, double MAX) { double Left, Right; double mid, midmid;

Similar to the slope of the optimization of things, really CF e will be the test center algorithm AH.It feels like this optimization should be very common, but the line is only the first quadrant, but the insertion, and the find operation is unchanged, by the angle of the order can be directly used in this template.#include #include#includestring.h>#include#includeusing namespaceStd;typedefLong Longll;structline{ll A, B; llGet(ll x) {returna*x+b; }};structconvex_hull{intsize; Line ls[200200]; vo

Analysis: The following is from: http://blog.csdn.net/acmaker/article/details/3178696Considering the following algorithm, the input of the algorithm is two convex polygons p and Q, respectively with M and n clockwise given vertices.1. Calculate the vertex with the lowest Y coordinate value on p (called YMINP) and the highest Y coordinate value on Q (called YMAXQ).2. Construct two tangent LP and LQ for polygons at YMINP and YMAXQ so that their corresp

There is a lot of trees in an area. A peasant wants to buy a rope to surround all these trees. So at first he must know the minimal required length of the rope. However, he does not know how to calculate it. Can you help him?The diameter and length of the trees is omitted, which means a tree can be seen as a point. The thickness of the rope is also omitted which means a rope can be seen as a line.There is no more than trees.Inputthe input contains one or more data sets. At first line of each inp

Bare convex bag. Very good write, nonsense not to say, direct sticker code.#include #include#include#include#include#defineRep (i,r) for (int i=0;iusing namespacestd;Const intmaxn=10000+5;structP {Doublex, y; P (Doublex=0,Doubley=0): X (x), Y (y) {} Poperator+ (P o) {returnP (x+o.x,y+o.y); } Poperator-(P o) {returnP (x-o.x,y-o.y); } BOOL operator== (ConstP o)Const { returnx==o.x y==o.y; } BOOL operatorConstP o)Const { retu

exactly to distance in metres (e.g., the distance between coordinate (ten;) and (11; 1 1) is one metre).OutputYou is to output a single integer value and the number of cows that can survive in the largest field you can construct using The available trees.Sample Input40 00 10175) 075 101Sample Output151Test instructions: In a forest to raise cattle, each cow needs 50 square meters of space, ask you how many cows can be raised?Puzzle: Convex bag Area/5

. OutputThe minimal length of the rope. The precision should be 10^-2. Sample Input9 12 7 24 9 30 5 41 9 80 7 50 87 22 9 45 1 50 7 0 Sample Output243.06 Sourceasia 1997, Shanghai (Mainland China) Recommendignatius.l Topic Analysis:To find the perimeter of the convex hull. The problem is about the same as getting wall. It is important to note that the number o

Link:#include int main(){ puts("转载请注明出处[辗转山河弋流歌 by 空灰冰魂]谢谢"); puts("网址：blog.csdn.net/vmurder/article/details/46591735");}ExercisesThe convex hull is first asked and then:Enumeration points i , and then for Point J Get the i And J (ordered) The point in the middle, and J And i (ordered) The point in the middle, is mo

(CODE) Low-rank Matrix Recovery and completion via convex optimizationThis is from http://blog.sina.com.cn/s/blog_631a4cc401012wah.html this link, I borrowed here, this blog has a small problem, I update the domain name can open, here record, also share.If the address of the first zip file is http://perception.csl.uiuc.edu/matrix-rank/Files/inexact_alm_rpca.zip, but this address is not open, will UIUC modified to Illinois, you can download.The blog Al

Test instructionsFor n points on a plane, the maximum triangular area of the n points is obtained.Analysis:Rotating jam, but to pay attention to the difference between the most distant point of the plane, the largest triangle of the edge is not necessarily on the convex hull, but also posted in the previously written to find the plane the furthest point of the POJ 2187 code as a comparison.Code:POJ 2079//sep9#include The code that asks for the farthes

Analysis: Directly to find convex hull, then calculate the edge length can be. In addition, only one point is handled separately for 0.00, and both points are processed separately for the distance.#include HDU ACM 1392 Surround the trees-> convex bag

Topic: given n convex polygons, the area of intersection is obtained.After many years I finally put the complete half-plane to make out ... It's so hard ...Once wrote a re to die so put on hold 0.0 today write a pitch is WA to the rhythm of death ...Not much to say directly on the code in fact Rujia classmates write trouble every time after inserting a half plane without both ends of the deletion of only one end of the final processing of the end of t

1007: [HNOI2008] Horizontal visible LineTime Limit: 1 Sec Memory Limit: 162 MBSubmit: 4567 Solved: 1686DescriptionThere are n linear l1,l2 on the Xoy Cartesian plane,... Ln, if the Y value is positive infinity down, you can see a sub-segment of Li, it is said that Li is visible, otherwise li is covered.For example, for a line:L1:y=x; L2:y=-x; L3:y=0Then L1 and L2 are visible, and L3 are covered.gives a line of N, expressed as a form of y=ax+b (| a|,| b|InputThe first behavior n (0 OutputFrom s

Convex hull template title.1 /*3285*/2#include 3#include 4#include 5#include 6#include 7 using namespacestd;8 9 #defineMAXN 55Ten Onetypedefstruct { A intx, y; - } point_t; - the point_t POINTS[MAXN]; - point_t STACK[MAXN]; - inttop; - + voidOutputint); - + DoubleDist (point_t A, point_t b) { A returnsqrt1.0* (a.x-b.x) * (a.x-b.x) + (A.Y-B.Y) * (a.y-b.y)); at } - - intDist2 (point_t A, point_t b) { - return(a.x-b.x) * (a.x-b.x) + (A.Y