（叉积，线段判交）HDU1086 You can Solve a Geometry Problem too

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（叉积，线段判交）HDU1086 You can Solve a Geometry Problem too

You can Solve a Geometry Problem too Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 12959 Accepted Submission(s): 6373 Problem Description Many geometry(几何)problems were designed in the ACM/…

HDU1086 You can Solve a Geometry Problem too(计算几何)

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You can Solve a Geometry Problem too （hdu1086）几何，判断两线段相交

You can Solve a Geometry Problem too Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 6837 Accepted Submission(s): 3303 Problem Description Many geometry(几何)problems were designed in the ACM/ICPC. A…

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(hdu step 7.1.2)You can Solve a Geometry Problem too(乞讨n条线段,相交两者之间的段数)

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hdu 1086 You can Solve a Geometry Problem too

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HDU 1086：You can Solve a Geometry Problem too

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(计算几何线段判交) 51nod1264 线段相交

1264 线段相交给出平面上两条线段的两个端点,判断这两条线段是否相交(有一个公共点或有部分重合认为相交). 如果相交,输出"Yes",否则输出"No". 输入第1行:一个数T,表示输入的测试数量(1 <= T <= 1000) 第2 - T + 1行:每行8个数,x1,y1,x2,y2,x3,y3,x4,y4.(-10^8 <= xi, yi <= 10^8) (直线1的两个端点为x1,y1 | x2, y2,直线2的两个端点为x3…

POJ 2653 Pick-up sticks（线段判交）

Description Stan has n sticks of various length. He throws them one at a time on the floor in a random way. After finishing throwing, Stan tries to find the top sticks, that is these sticks such that there is no stick on top of them. Stan has noticed…

HDU 1086 You can Solve a Geometry Problem too（判断线段是否相交水题）

链接:传送门题意:给出 n 个线段找到交点个数思路:数据量小,直接暴力判断所有线段是否相交 /************************************************************************* > File Name: hdu1086.cpp > Author: WArobot > Blog: http://www.cnblogs.com/WArobot/ > Created Time: 2017年05月07日星期日 23时34…

hdu 1086 You can Solve a Geometry Problem too [线段相交]

题目:给出一些线段,判断有几个交点. 问题:如何判断两条线段是否相交? 向量叉乘(行列式计算):向量a(x1,y1),向量b(x2,y2): 首先我们要明白一个定理:向量a×向量b(×为向量叉乘),若结果小于0,表示向量b在向量a的顺时针方向:若结果大于0,表示向量b在向量a的逆时针方向:若等于0,表示向量a与向量b平行.(顺逆时针是指两向量平移至起点相连,从某个方向旋转到另一个向量小于180度).如下图: 在上图中,OA×OB = 2 > 0, OB在OA的逆时针方向:OA×OC = -2 <…

hdu_1086 You can Solve a Geometry Problem too(计算几何)

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HDU 1086You can Solve a Geometry Problem too(判断两条选段是否有交点）

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【HDOJ】1086 You can Solve a Geometry Problem too

数学题,证明AB和CD.只需证明C.D在AB直线两侧,并且A.B在CD直线两侧.公式为:(ABxAC)*(ABxAD)<= 0 and(CDxCA)*(CDxCB)<= 0 #include <stdio.h> #define MAXNUM 105 typedef struct { double x1, y1; double x2, y2; } line_st; line_st lines[MAXNUM]; int cal(int i, int j) { double ab_x,…

Hdoj 1086.You can Solve a Geometry Problem too 题解

Problem Description Many geometry(几何)problems were designed in the ACM/ICPC. And now, I also prepare a geometry problem for this final exam. According to the experience of many ACMers, geometry problems are always much trouble, but this problem is ve…