原题: D. Pair Of Lines time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output You are given n points on Cartesian plane. Every point is a lattice
UVA378 Intersecting Lines 题解 怎么这么多点斜式邪教啊。 解法 在计算几何中,我们应该尽可能地避免使用浮点数的计算,尽可能地使用向量计算。 本篇题解默认读者具有向量基础。 为了方便讲解,我们将输入的四个点分别记作 A , B , C , D A,B,C,D A,B,C,D。 考虑两条直线 A B , C D AB,CD AB,CD 何时平行。根据向量叉乘的
John has several lines. The lines are covered on the X axis. Let A is a point which is covered by the most lines. John wants to know how many lines cover A. Input The first line contains a single in
Problem Description John has several lines. The lines are covered on the X axis. Let A is a point which is covered by the most lines. John wants to know how many lines cover A. Input
题目: 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) inte
这道题是普及-,结果我比赛时想了整整一个小时。。。果然我还是太菜了啊QAQ 题目大意 解题思路 佬曰:“有人看到这道题直接网络流。” 网络流?最大独立集?大可不必。题目中最关键的一句话其实是 注意:输入数据不保证 gcd ( a , b ) = 1 \gcd(a,b)=1 gcd(a,b)=1。 真是一语点醒梦中人。事实上,我们需要充分利用 a a a, b b b
题目背景 Farmer John最近发明了一个游戏,来考验自命不凡的贝茜。 题目描述 Farmer John has challenged Bessie to the following game: FJ has a board with dots marked at N (2 ≤ N ≤ 200) distinct lattice points. Dot i has the integer