poj1269计算几何直线和直线的关系】的更多相关文章

We all know that a pair of distinct points on a plane defines a line and that a pair of lines on a plane will intersect in one of three ways: 1) no intersection because they are parallel, 2) intersect in a line because they are on top of one another…
依旧是叉积的应用 判定重合:也就是判断给定的点是否共线的问题——叉积为0 if(!cross(p1,p2,p3) && !cross(p1,p2,p4))printf("LINE\n"); 因为给的是整数所以用非号来判断 平行也好说,就用高中知识就行了 else if((x1 - x2) * (y3 - y4) == (y1 - y2) * (x3 - x4))printf("NONE\n"); 接下来就是求交点了,设焦点为x,那么p1,p2,x共线…
Problem D Morley's Theorem Input: Standard Input Output: Standard Output Morley's theorem states that that the lines trisecting the angles of an arbitrary plane triangle meet at the vertices of an equilateral triangle. For example in the figure below…
#include<iostream> #include<cstring> #include<cstdio> #include<algorithm> #include<cmath> using namespace std; ; const double inf = 1e20; const double pi = acos(-1.0); ; int sgn(double x){ ; ); ; } inline double sqr(double x)…
题意:    判断直线间位置关系: 相交,平行,重合 include <iostream> #include <cstdio> using namespace std; struct Point { int x , y; Point(, ) :x(a), y(b) {} }; struct Line { Point s, e; int a, b, c;//a>=0 Line() {} Line(Point s1,Point e1) : s(s1), e(e1) {} void…
1007: [HNOI2008]水平可见直线 Description 在xoy直角坐标平面上有n条直线L1,L2,...Ln,若在y值为正无穷大处往下看,能见到Li的某个子线段,则称Li为可见的,否则Li为被覆盖的.    例如,对于直线:    L1:y=x; L2:y=-x; L3:y=0    则L1和L2是可见的,L3是被覆盖的.    给出n条直线,表示成y=Ax+B的形式(|A|,|B|<=500000),且n条直线两两不重合.求出所有可见的直线. Input 第一行为N(0 <…
TOYS Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 12015   Accepted: 5792 Description Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts his toys away w…
Problem ATriangle Fun Input: Standard Input Output: Standard Output In the picture below you can see a triangle ABC. Point D, E and F divides the sides BC, CA and AB into ratio 1:2 respectively. That is CD=2BD, AE=2CE and BF=2AF. A, D; B, E and C, F…
Mirror and Light Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 650    Accepted Submission(s): 316 Problem Description The light travels in a straight line and always goes in the minimal path b…
题目链接:http://poj.org/problem?id=1269 题面: Description We all know that a pair of distinct points on a plane defines a line and that a pair of lines on a plane will intersect in one of three ways: 1) no intersection because they are parallel, 2) interse…