convex hexagon

algorithm, but also the image of geometry and intuitive. This combination of two seemingly contradictory features made her a very interesting subject.Calculate geometry, which is weighed on the calculation. That is, we use the computer, select efficient algorithm to solve the problem of geometry. See, eventually still settled in the "algorithm", so if said "computational geometry" is wrapped in "geometric" coat "algorithm design", completely can.Since the study is an algorithm, it must also be

--graham_scan algorithm for convex hullSort by y-x first, sort by the polar angle of p0, then scanPoint STK[MAXN];inttop;BOOLCmpyx (ConstPoint A,ConstPoint B)//Sort by Y-x{ if(A.Yreturn true; if(a.y==b.y) { returna.xb.x; } return false;}BOOLcmpConstPoint A,ConstPoint B)//Sort by Polar angle{ return(a-p[0]) * (b-p[0]) >EPS;}voidGraham_scan () {sort (p,p+N,cmpyx); Sort (P+1, p+n,cmp); Top=0;//simulating stacks with arraysstk[top++]=p[0];

http://poj.org/problem?id=1584 Test instructions: Clockwise or counter-clockwise point, let you first determine whether the polygon is convex, if not output hole is ill-formed If yes, determine if a circle of a given size and position can be completely contained if (OK)printf ("PEG would fit\n");Elseprintf ("PEG would not fit\n"); 1 Turn the dots counterclockwise, And then the convex, Then judge whether t

lap Pool time limit: Ms | Memory limit: 65535 KB Difficulty: 4 Just finished HDU1392, see this problem, well, the original code changed on the past. Test instructions said, will convex bag words is very simple, will not be difficult, this problem time limit is 4s, data 100, will cross product words three layer loop traversal can, two points determine a line segment to judge apart from the two points outside the other points are on the side of this li

Given a convex polygon with n vertices (numbered 1 to n clockwise), the weights of each vertex are known. Ask how to divide this convex polygon into N-2 disjoint triangles, making the sum of the weights of the vertices of these triangles a minimum. F[I][J] represents the smallest weight from the numbered I to J (clockwise) after the successive vertices are divided; then the problem solved becomes f[1][n]

This article is a little bit of knowledge about optimization problems before SVM, which is used in SVM. Considering the complexity of SVM, the basic knowledge of optimization is put forward, this article, so, this article will not involve the optimization problem of many deep-seated problems, but in the scope of personal knowledge of the SVM is involved in the optimization problem.One, convex optimization problemIn the optimization problem, the

Some institutions in the Chinese continental mathematical field the definition of function convexity differs from others.So let's talk about convex functions (convex function) for what is called convex (convex):this is because the convex function is associated with a

Problem The main problem with a triangle is that it is flat. If you use two triangles to draw a huge wall and attach a beautiful texture to the wall, the result is disappointing. You can divide a triangle into smaller triangles to add details. This requires defining the 3D position of each vertex, but this consumes too much resources. Solution You can replace this ugly method with concave-convex ing. The concave-

/* ===================================================== ===============* \ | 3D convex hull | call: build convex hull = construct (); \ * =================================================== ===============*/# define TPN 1010 struct tpoint {Double X, y, Z; void get () {scanf ("% lf", X, Y, Z) ;} tpoint () {} tpoint (double _ x, double _ y, double _ z): X (_ x), y (_ y), Z (_ z) {} tpoint operator-(const

The knowledge about convex hull is not difficult to understand, and a little look can understand the process and principle of convex package.1. What is a convex bag?In a real vector space V, for a given set X, all the intersection s of the convex sets that contain x are called conv