lele_pipi

一、计算几何向量:A(x1,y1)  B(x2,y2)  C(x3,y3)  D(x4,y4)向量叉乘：叉积的几何意义：1：其模的结果是a和b为相邻边形成平行四边形的面积。2：结果有正有负，有sin（a，b）可知和其夹角有关，夹角大于180°为负值。3：叉积不满足交换律应用：1：通过结果的正负判断两矢量之间的顺逆时针关系若 a x

SegmentsDescriptionGiven n segments in the two dimensional space, write a program, which determines if there exists a line such that after projecting these segments on it, all projected segments

Toy StorageDescriptionMom and dad have a problem: their child, Reza, never puts his toys away when he is finished playing with them. They gave Reza a rectangular box to put his toys in. Unfortun

IntersectionDescriptionYou are to write a program that has to decide whether a given line segment intersects a given rectangle. An example: line: start point: (4,9) end point: (11,2) rec