CSci 3501 Algorithms and Computability - Lab 12.

Due Wednesday, December 7th at 11:59pm

What to submit and when:

• All submissions are electronic: by e-mail to elenam at morris.umn.edu and CC to all lab partners. Please do not delete your e-mail from "Sent mail" or your mailbox until the end of the semester.
• When working on the lab, please comment your work so that it is clear what contributions of each person are.
• At the end of the lab each group should send me the results of their in-class work. Please indicate if this is your final submission.
• If your submission at the end of the lab time was not final, please send me(CC to the lab partner(s)) a final copy before the due time. Please use the subject "3501 Lab N", where N is the lab number.

Lab assignment

Work in groups as assigned.

Lab overview and goals

The goals of the lab are: to get experience with algorithmic problem-solving; to get practice with the pumping lemma for context-free languages.

Play the context-free "pumping lemma game" (7 points)

Use the tutorial for the pumping lemma. Play the "pumping lemma game" for the following examples. For each example state whether the language is context-free; justify it based on which side has a winning strategy in the pumping lemma game. If submitting your write-up as a text file, please use .txt extension.

• The third language (a^n b^j a^n b^j, n >= 0, j >= 0) -- computer goes first.
• The eighth language (a^k b^n c^n d^j: j not equal to k) -- you go first

Problem-solving (30 points)

For this lab you will be working on a problem defined here. Please log in with your dungeon user name and password. Groups are assigned. The problem statement is in Help/Documentation.

You should download a Desktop application for testing (also in Help/Documentation).

Problem submissions generate scores for a given set of test cases. You can also generate random test cases or define your own via the Desktop application.

Every group should submit at least one copy of the code at the end of the lab. Solutions are automatcially scored on the current set of tests when you submit them.

Your solution will be evaluated both on the set of test cases that are posted now and on a different (final) set that I will activate next Thursday.

What to submit

• Submit the JFLAP files and the writeups for the pumping lemma problem.
• Solutions for the polygon problem must be uploaded directly into the web application.

CSci 3501 course web site.