题目大意:给出一个线段的两端,和矩形两端(不一定是左上和右下),问线段是否与矩形相交(若线段在矩形内也算相交).这题蒸鹅心-- 题目思路:判断所有情况:线段是否在矩形内,线段内一点是否在矩形内,线段是否与四边相交(叉积),线段的两端是否在矩形上,矩形的四点是否在线段上. 要注意的是: 1.如果两条线段的叉积为0,也可能共线但不相交. 2.判断点在线段上的方法:叉积为0,且到两点的距离与线段等长. #include<cstdio> #include<cstdlib> #include…

题目链接:POJ 1410 Description You 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) rectangle: left-top: (1,5) right-bottom: (7,1) Figure 1: Line se…

计算几何的题目, 学cv的要做一下.poj 地址: http://poj.org/problem?id=1410 题意:判断一个直线段,是否与一个矩形有相交点. 解决方案: 判断矩形的每一条边是否与直线段相交, 则归结为判断直线段相交问题,然后判断两条线段是否相交的条件,是看每一条线段的两个点,是否分布在另一条直线的两端. 利用斜率可以求解. // // 1410 #include <iostream> #include <cstdio> #include <cstdlib&…

D. Area of Two Circles' Intersection time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given two circles. Find the area of their intersection. Input The first line contains three int…

Intersection Time Limit: 4000/4000 MS (Java/Others)    Memory Limit: 512000/512000 K (Java/Others)Total Submission(s): 3018    Accepted Submission(s): 1135 Problem Description Matt is a big fan of logo design. Recently he falls in love with logo made…

题目链接: Intersection Time Limit: 4000/4000 MS (Java/Others)     Memory Limit: 512000/512000 K (Java/Others) Problem Description   Matt is a big fan of logo design. Recently he falls in love with logo made up by rings. The following figures are some fam…

题目大意:求线段与实心矩形是否相交. 解题关键:转化为线段与线段相交的判断. #include<cstdio> #include<cstring> #include<algorithm> #include<cstdlib> #include<cmath> #include<iostream> #define eps 1e-8 using namespace std; typedef long long ll; struct Point…

1.poj2318 TOYS 传送:http://poj.org/problem?id=2318 题意:有m个点落在n+1个区域内.问落在每个区域的个数. 分析:二分查找落在哪个区域内.叉积判断点与线段的位置. #include<iostream> #include<cstring> #include<algorithm> using namespace std; ; struct point{ int x,y; point(){ } point(int _x,int…

图论 图论解题报告索引 DFS poj1321 - 棋盘问题 poj1416 - Shredding Company poj2676 - Sudoku poj2488 - A Knight's Journey poj1724 - ROADS(邻接表+DFS) BFS poj3278 - Catch That Cow(空间BFS) poj2251 - Dungeon Master(空间BFS) poj3414 - Pots poj1915 - Knight Moves poj3126 - Prim…

Matt is a big fan of logo design. Recently he falls in love with logo made up by rings. The following figures are some famous examples you may know.A ring is a 2-D figure bounded by two circles sharing the common center. The radius for these circles…