Online JudgeProblem SetAuthorsOnline ContestsUser
Web Board
Home Page
Statistical Charts
Submit Problem
Online Status
Update your info
Authors ranklist
Current Contest
Past Contests
Scheduled Contests
Award Contest
User ID:
Commuter train
Time Limit: 2000MSMemory Limit: 65536K
Total Submissions: 520Accepted: 138Special Judge


You might have noticed that bus drivers sometimes pass by passengers waiting for the bus and stop at a place where the distance from the people to the bus doors is maximal. We don’t know exact reasonsof such behaviour, probably, this is done not because of some special wickedness of the driver but in order to allow passengers in the vehicle to get off quicker. However, we know that in one far-away countrythe government decided to implement automatic driving system on their commuter railroads. Amongother features, this system is intended to automatically stop commuter trains at stations. A computer in the train is connected to a special radar, which determines passenger positions at the station platform. The computer decides where to stop the train in order to maximize the sum of the distances from each passenger to the closest door. All the hardware is ready, but the software project is late (transport problems). Your task is to implement this function for this software project.
More precisely: The platform has length 0 < L <= 5000. There are 0 < M <= 300 passengers at the station platform. Each passenger p has position Pp (0 <= P1 <= ... <= PM <= L) — the distance from the platform beginning to the passenger. There are 0 < N <= 300 doors in the train. Each door d has position Dd (0 = D1 < D2 < ... < DN <= L) -- the distance from it to the door 1. The door width and the passenger sizes are not taken into account. For simplicity, you can assume that the distance between a passenger i and a train door j is dist(i, j, S) = |Dj + S - Pi|, where S is train position -- the distance between the first door and the beginning of the platform. Remember that the train must stop so that no door is outside of the platform.


The input contains integer numbers, separated by spaces and/or line feeds. At the beginning of the file
there is the station description L, M, and P1 ... PM, followed by the train description N and D2 ... DN.


You should output two numbers -- the train position S, at which the maximal possible sum of the minimal distances between the passengers and the doors can be achieved and the sum by itself. If there are many such train positions -- output any one.

Sample Input

0 1 2 3 4
1 2 3

Sample Output

0.5 2.5


Northeastern Europe 2002, Northern Subregion

[Submit]   [Go Back]   [Status]   [Discuss]

Home Page   Go Back  To top

All Rights Reserved 2003-2013 Ying Fuchen,Xu Pengcheng,Xie Di
Any problem, Please Contact Administrator