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1922:Subway planning

题目描述
The government in a foreign country is looking into the possibility of establishing a subway system in its capital. Because of practical reasons, they would like each subway line to start at the central station and then go in a straight line in some angle as far as necessary. You have been hired to investigate whether such an approach is feasible. Given the coordinates of important places in the city as well as the maximum distance these places can be from a subway station (possibly the central station, which is already built), your job is to calculate the minimum number of subway lines needed. You may assume that any number of subway stations can be
built along a subway line.

Figure 1: The figure above corresponds to the first data set in the example input.
输入解释
The first line in the input file contains an integer N, the number of data sets to follow. Each set starts with two integers, n and d (1 <= n <= 500, 0 <= d < 150). n is the number of important places in the city that must have a subway station nearby, and d is the maximum distance allowed
between an important place and a subway station. Then comes n lines, each line containing two integers x and y (-100 <= x, y <= 100), the coordinates of an important place in the capital. The central station will always have coordinates 0, 0. All pairs of coordinates within a data set
will be distinct (and none will be 0, 0).
输出解释
For each data set, output a single integer on a line by itself: the minimum number of subway lines needed to make sure all important places in the city is at a distance of at most d from a subway station.
输入样例
2
7 1
-1 -4
-3 1
-3 -1
2 3
2 4
2 -2
6 -2
4 0
0 4
-12 18
0 27
-34 51
输出样例
4
2
来自杭电HDUOJ的附加信息
Recommend wangye

该题目是Virtual Judge题目,来自 杭电HDUOJ

题目来源 NM2003

源链接: HDU-1922

最后修改于 2020-10-25T22:48:53+00:00 由爬虫自动更新

共提交 0

通过率 --%
时间上限 内存上限
5000/1000MS(Java/Others) 65536/32768K(Java/Others)