Sphere Online Judge

SPOJ Problem Set (classical)

9655. Elevator Trouble

Problem code: ELEVTRBL

You are on your way to your rst job interview as a program tester, and you are already
late. The interview is in a skyscraper and you are currently in
oor s, where you see an
elevator. Upon entering the elvator, you learn that it has only two buttons, marked UP
u" and DOWN d". You conclude that the UP-button takes the elevator u
floors up
(if there aren't enough
oors, pressing the UP-botton does nothing, or at least so you
assume), whereas the DOWN-button takes you d stories down (or none if there aren't
enough). Knowing that the interview is at
floor g, and that there are only f
floors in
the building, you quickly decide to write a program that gives you the amount of button
pushes you need to perform. If you simply cannot reach the correct
floor, your program
halts with the message "use the stairs".
Given input f, s, g, u and d (
floors, start, goal, up, down), nd the shortest sequence
of button presses you must press in order to get from s to g, given a building of floors,
or output "use the stairs" if you cannot get from s to g by the given elevator.


The input will consist of one line, namely f s g u d, where 1 <= s; g <= f <= 1000000 and
0 <= u; d <= 1000000. The
floors are one-indexed, i.e. if there are 10 stories, s and g be in
[1; 10].


You must reply with the minimum numbers of pushes you must make in order to get from
s to g, or output use the stairs if it is impossible given the con guration of the elvator.


10 1 10 2 1

Added by:Krzysztof Lewko
Time limit:1s
Source limit:50000B
Memory limit:256MB
Cluster: Pyramid (Intel Pentium III 733 MHz)
Resource:Nordic programming contest

hide comments
2014-06-26 12:26:35 |RAMžDEN|
my first problem based on bfs :)
2014-06-15 12:26:42 Sajal Sharma
@Legolas : DFS will give wrong answer... because it will not give the minimum result...i hope u got my point.. nice question...
2014-06-08 21:29:08 Subrata Roy
Getting "runtime error (SIGFPE)" in test case 12..!!
2013-11-01 08:15:38 Legolas
DFS gives WA, while BFS passes.
2013-09-06 17:35:30 Sourav Chakraborty
awesome problem :)
2013-07-03 06:48:30 shiva_hellgeek
easy one
2013-05-12 14:48:52 Ashhar Jawaid
think it to be a tree ;) gr8 question
2013-05-10 09:09:30 Kumar Mrinal
Child's Play :D :D
2013-03-20 14:32:49 raunak_talwar
nyce1..AC :D
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