y2 y1 over x2 x1

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Why is the parallelogram area between two vectors (x1, Y1), (X2, Y2) (x1 * y2-x2 * Y1 )?

Link: http://blog.csdn.net/zhangxaochen/article/details/8027003 All of a sudden, I want to solve this problem. In fact, this is just a sentence that I don't know .. It is estimated that college students like me have to wait for a moment to

Two-dimensional graph with weighted matching (thinking of pushing box problem)

Reprint please attach the original link: http://blog.csdn.net/u013351484/article/details/51598270Binary graph with weighted matching (also called binary graph Optimal (best) matching,kuhn-munkres algorithm )Preliminary knowledge: Binary graph

HTML5 Erase effect for eraser

Original: HTML5 Erase effect for eraser  Disclaimer: This article is original article, if need reprint, please indicate source waxes, thank you!  Recently the project just used this effect, that is, a bit like a scratch card, on the mobile device, a

HTML5 Erase effect for eraser

Disclaimer: This article is original article, if need reprint, please indicate source waxes, thank you!Recently the project just used this effect, that is, a bit like a scratch card, on the mobile device, a picture is scraped off to show another

HTML5 Erase effect for eraser

  Disclaimer: This article is original article, if need reprint, please indicate source waxes, thank you!  Recently the project just used this effect, that is, a bit like a scratch card, on the mobile device, a picture is scraped off to show another

Cryptography in 1.3.2 Blockchain--Elliptic curve cryptography (ECC)

Today Learning elliptic curve cipher (Elliptic Curve CRYPTOGRAPHY,ECC) algorithm, his hand lacks the introduction of the algorithm of professional books, so on the internet to check a lot of blog and books, but most of the blog writing is really ...

POJ 3304 Segments (computational geometry basis)

Segments Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 11593 Accepted: 3657 DescriptionGiven n segments in the dimensional space, write a program, which determines if there

Introduction to the principle of ECC encryption algorithms

Preface Like RSA (names of Ron Rivest, Adi Shamir, And Len Adleman), ECC (elliptic curves cryptography, Elliptic Curve Cryptography) is also a public key algorithm. At present, there are not many public documents about ECC in China (I have not found

Introduction to the principle of ECC encryption algorithm

ObjectiveLike RSA (Ron Rivest,adi Shamir,len Adleman three-bit genius), ECC (Elliptic Curves cryptography, Elliptic curve cryptography) also belongs to the public key algorithm. At present, the domestic detailed introduction of ECC in the public

Implementation of image cutting using direct technology

Xuyan: This is a superficial article. Strictly speaking, it is not a technical article. It can only be said that it is a bit of your own experience in learning direct programming, however, it still contains a lot of basic knowledge about Win32

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