4445: [Scoi2015] small convex want to run
Time Limit:2 Sec Memory limit:128 MBsubmit:756 solved:280[Submit] [Status] [Discuss]Description
Xiao Convex evening like to go to the playground to run, today he finished two laps, he played such a game.The playground is a convex n-shaped, n vertices are numbered counterclockwise from the 0~n-l. Now the little
Reading test instructions is critical, enter a point on the convex hull (no point inside the convex hull, either the convex hull vertex or the point on the convex edge) to determine whether the convex hull is stable. The so-called stability is to determine whether the origin
the
Xiao Convex evening like to go to the playground to run, today he finished two laps, he played such a game.The playground is a convex n-shaped, n vertices are numbered counterclockwise from the 0~n-l. Now a small convex random stand in the playground of a position, marked as P point. The P-point and N-vertices are connected to each other to form n triangles.
The principle of convex hull, here is not much introduced.
A few days ago, I encountered a common-line convex hull problem. Because of their own drawings, directly with the polar coordinates of the template up to do, WA a day.
Then you look for information, read other people's code, read books.
Finally, the polar order of the convex hull does not solve the collin
Time is fast; I think of a report on the convex problem made by Nankai classmate last year.The following is a friend of the letter written, paste it over with ^_^:The general expression of the optimization problem in mathematics is to get, that is, the n-dimensional vector, the feasible domain, is the real value function on.The convex set refers to any two points in the set, that is, any two points of the c
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
Today, the company started a discussion class on machine learning. During this period, a student asked: why is the mean square error function of linear regression convex (like this )? I was excited that the conclusion "convex function is also convex function by polynomial combination" is incorrect. It should be that the conve
How to design concave and convex words in ppt
Although the animation effect is very difficult to copy, but the static effect of this text is very easy to use PPT to achieve, today in this article on the graphics and text detailed use PPT to make the design of concave and convex words.
To do the key point of concave and convex text: font on the top of the shadow
2618: [Cqoi2006] Convex polygon Time Limit:5 Sec Memory limit:128 MBsubmit:878 solved:450[Submit] [Status] [Discuss] The vertex coordinates of n convex polygons are given by Description , and the area of their intersection is obtained. For example, when n=2, two convex polygons are shown below:
The area of the intersecting part is 5.233. Input
The first line has
Scrambled Polygon
Time Limit: 1000MS
Memory Limit: 30000K
Total Submissions: 7214
Accepted: 3445
DescriptionA closed polygon is a figure bounded by a finite number of line segments. The intersections of the bounding line segments is called the vertices of the polygon. When one starts at any vertex of a closed polygon and traverses each bounding line segment exactly once, one comes back to The starting vertex.
A
Merge convex hull
Consider the following question: what is the Minimum Convex Polygon that contains two convex polygon? The answer is the convex polygon obtained after the convex hull is merged.
The merge convex hull can be imp
Convex hull algorithm for planar circleWe've discussed this interesting question before:
There are several circles on the plane that contain the intersection of all the convex sets of these circles.
Based on the results discussed earlier, it is wrong to do a scan line directly by the center of the circle. We need to consider whether each point on the circle can be part of the
Http://www.codeforces.com/problemset/problem/70/D
Two operations
1: Add a vertex to form a new convex hull
2: Determine whether a point is in a convex hull
There are two ways to do this, but they are similar, all based on the convex hull method.
For example, when a convex packet is obtained in a horizontal
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]
Method for Determining Convex Polygon
In the calculation of geometric and geographic information systems, it is very important to determine the convex and convex aspects of polygon. So what are concave polygon and convex polygon? First, we can intuitively understand that a convex
Understand the convex bag first
The convex package must first say the definition of convexity, the simple point is that the point of any two points in the plane neighborhood is in the neighborhood, then the neighborhood has convexity. With a simple scrutiny, it can be found that a point with a first order derivative discontinuity in the neighborhood must not be represented linearly by a set of dots. Further
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