# POJ 3668 Game of Lines C语言版

POJ题解 1391浏览

Description

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 coordinates Xi and Yi (-1,000 ≤ Xi ≤ 1,000; -1,000 ≤ Yi ≤ 1,000).

Bessie can score a point in the game by picking two of the dots and drawing a straight line between them; however, she is not allowed to draw a line if she has already drawn another line that is parallel to that line. Bessie would like to know her chances of winning, so she has asked you to help find the maximum score she can obtain.

Input

* Line 1: A single integer: N
* Lines 2..N+1: Line i+1 describes lattice point i with two space-separated integers: Xi and Yi.

Output

* Line 1: A single integer representing the maximal number of lines Bessie can draw, no two of which are parallel.

Sample Input

4
-1 1
-2 0
0 0
1 1

Sample Output

4

Slyar:题目大意就是求N个点最多确定多少条互不平行的直线。

### 网友最新评论 (2)

1. 不能和0比较，可以和0.0比较啊！
匿名8年前 (2010-10-13)回复
2. 这一个礼拜我都不用来你博客了……全是鸟语……
Jutoy10年前 (2009-04-21)回复