Pro.ID1355 TitleGame of Lines Title链接http://10.20.2.8/oj/exercise/problem?problem_id=1355 AC21 Submit123 Ratio17.07% 时间&空间限制描述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 coordinates Xi and Yi ( -1000 ≤ Xi ≤ 1000; -1000 ≤ Yi ≤ 1000 ). 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. 输入多测试用例。每个测试用例： * 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 . 输出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 ( -1000 ≤ Xi ≤ 1000; -1000 ≤ Yi ≤ 1000 ). 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 多测试用例。每个测试用例： * 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 每个测试用例输出一行: A single integer representing the maximal number of lines Bessie can draw, no two of which are parallel. Sample Input 4 Sample Output 4 Hint 本题请用 hash 来做。 Source 样例输入4 样例输出4 提示本题请用 hash 来做。 |
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