# 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

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### 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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