3029：Tour Guide

题目描述

You are working as a guide on a tour bus for retired people, and today you have taken your regular Nordic seniors to The Gate of Heavenly Peace. You let them have a lunch break where they could do whatever they like. Now you have to get them back to the bus, but they are all walking in random directions. You try to intersect them, and send them straight back to the bus. Minimize the time before the last person is in the bus. You will always be able to run faster than any of the tour guests, and they walk with constant speed, no matter what you tell them. The seniors walk in straight lines, and the only way of changing their direction is to give them promises of camphor candy. A senior will neither stop at nor enter the bus before given such a promise.

输入解释

A number of test cases consisting of: A line with an integer 1 ≤ n ≤ 8, the number of people on the tour. A line with an floating point number 1 < v ≤ 100, your maximum speed (you start in the bus at the origin). Then follow n lines, each containing four floating point numbers x_i y_i v_i a_i, the starting coordinates (−10⁶ ≤ x_i, y_i ≤ 10⁶), speed (1 ≤ v_i < 100) and direction (0 ≤ a_i < 2π) of each of the tour guests.

The input is terminated by a case with n = 0, which should not be processed. All floating point numbers in the input will be written in standard decimal notation, and have no more than 10 digits.

输出解释

For each test case, print a line with the time it takes before everybody is back in the bus (the origin). Round the answer to the nearest integer. The answer will never be larger than 10⁶.

输入样例

1
50.0
125.0 175.0 25.0 1.96
3
100.0
40.0 25.0 20.0 5.95
-185.0 195.0 6.0 2.35
30.0 -80.0 23.0 2.76
0

输出样例

20
51

提示

Q: Should 2.5000000000 be rounded to 3?
A: We have constructed the test cases such that it does not matter.

该题目是Virtual Judge题目，来自北京大学POJ

题目来源 Nordic 2006

源链接： POJ-3029

最后修改于 2020-10-29T06:50:37+00:00 由爬虫自动更新

共提交 0 次

通过率 --%

时间上限	内存上限
1000	65536