Assignments | Course Home | Documentation | Lab Hours/Tutoring | Schedule | Submit

Saint Louis University

Computer Science 180
Data Structures

Michael Goldwasser

Spring 2014

Dept. of Math & Computer Science


Lab Assignment 05

Topic: Tanning Salon
Source Code: salon.cpp
Live Archive Ref#: 2538

Pre-lab Due:

Tuesday, 25 February 2014, 10:00am
Submission Deadline: Wednesday, 26 February 2014, 11:59pm

Techniques:

Various

Collaboration Policy

The pre-lab requirement must be completed and submitted individually.

The remainder of the lab activity should be completed working in pairs. One person should submit the result, making sure that both partners' names are clearly identified in that submission.

Please make sure you adhere to the policies on academic integrity in this regard.


Pre-Lab Requirement

Read the complete problem description and then determine what the expected output should be if given the following input:

Prelab input: Prelab output:
2 CBALLMMACZBDDZ
5 VWXYZWVXYZABCDEFFABCDE
0


Tanning Salon

Tan Your Hide, Inc., owns several coin-operated tanning salons. Research has shown that if a customer arrives and there are no beds available, the customer will turn around and leave, thus costing the company a sale. Your task is to write a program that tells the company how many customers left without tanning.

The input consists of data for one or more salons, followed by a line containing the number 0 that signals the end of the input. Data for each salon is a single line containing a positive integer, representing the number of tanning beds in the salon, followed by a space, followed by a sequence of uppercase letters. Letters in the sequence occur in pairs. The first occurrence indicates the arrival of a customer, the second indicates the departure of that same customer. No letter will occur in more than one pair. Customers who leave without tanning always depart before customers who are currently tanning. There are at most 20 beds per salon.

For each salon, output a sentence telling how many customers, if any, walked away. Use the exact format shown below.

Example input:
2 ABBAJJKZKZ
3 GACCBDDBAGEE
3 GACCBGDDBAEE
1 ABCBCA
0
Example output:
All customers tanned successfully.
1 customer(s) walked away.
All customers tanned successfully.
2 customer(s) walked away.

Hints

I'll admit that I picked this problem because, superficially, it seemed like the salon behaves sort of like a stack, or a queue, or a leaky stack, or something along those lines. In reality, none of those abstractions apply.

My recommendation for data structures is the following:

All that's left is to loop through the input string and decide how to accurately update the simulation for each step.

Judge's Data

You can run the automated judge's tests on turing to test the correctness of your program (although you must still formally submit the source code via the course website). If you are working on your own machine (or if you just want to examine the judge's inputs and expected outputs), we provide them here.


Michael Goldwasser
CSCI 180, Spring 2014
Last modified: Tuesday, 25 February 2014
Assignments | Course Home | Documentation | Lab Hours/Tutoring | Schedule | Submit