当前你的浏览器版本过低,网站已在兼容模式下运行,兼容模式仅提供最小功能支持,网站样式可能显示不正常。
请尽快升级浏览器以体验网站在线编辑、在线运行等功能。

建议使用的浏览器:

谷歌Chrome 火狐Firefox Opera浏览器 微软Edge浏览器 QQ浏览器 360浏览器 傲游浏览器

1380:Nonstop Travel

题目描述
Fast Phil works the late shift and leaves his company's parking lot at precisely 2:00 AM every morning. His route home is by a straight road which has one or more traffic signals. Phil has always wondered if, given the locations and cycles of each of the traffic signals, are there velocities he can travel home without ever having to speed up or slow down on account of a red light. You are to write a program to satisfy his curiosity.

Your program should find all integer speeds (in miles per hour) which can be used for Phil's trip home. Each speed is a rate (in miles per hour) he can maintain the moment he leaves the parking lot at 2:00 AM until he arrives home (we assume Phil has a long driveway in which to decelerate) such that he never passes through a red signal. He is allowed to pass throgh a signal at the exact moment it turns from yellow to red, or at the exact moment a red signal turns green. Since Phil is a relatively law-abiding citizen, you need only consider speeds less than or equal to 60 mph. Likewise, Phil isn't interested in travelling too slowly, so you should not consider speeds lower than 30 mph.
输入解释
Input will consist of one or more sets of data describing a set of traffic signals, followed by the integer -1. The first integer in each set will contain the value N (specifying the number of traffic signals). N will be no larger than 6. This value will be followed by N sets of numbers, each containing values (in order) for L, G, Y and R. L is a positive real number indicating the location of a traffic signal, in miles, from the parking lot. G, Y and R are the lengths of time (in seconds) of the green, yellow, and red periods of the corresponding traffic signal's cycle. Phil has learned from an informant in the Highway Department that all N traffic signals start their green period precisely at 2:00 AM.
输出解释
Output should consist of the input case number (starting with 1) followed by a list of all valid integer speeds Phil may drive to avoid the red signals. Consecutive integer speeds should be specified in interval notation of the form L-H, where L and H are the lowest and highest speeds for the interval. Intervals of the form L-L (that is, an interval of length 1) shold just be written as L. Intervals should be separated by commas. If there are no valid speeds, you program should display the phrase No acceptable speeds. The Expected Output below illustrates this format.
输入样例
1
5.5 40 8 25

3
10.7 10 2 75
12.5 12 5 57
17.93 15 4 67

-1
输出样例
Case 1: 30, 32-33, 36-38, 41-45, 48-54, 59-60
Case 2: No acceptable speeds.
来自杭电HDUOJ的附加信息
Recommend Eddy

该题目是Virtual Judge题目,来自 杭电HDUOJ

源链接: HDU-1380

最后修改于 2020-10-25T22:44:27+00:00 由爬虫自动更新

共提交 260

通过率 82.69%
时间上限 内存上限
2000/1000MS(Java/Others) 65536/32768K(Java/Others)