
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Dictionary Walk
Program
Using Java, write a program which takes two words as inputs and walks through the dictionary and creates a list of words between them. Two words are “adjacent” if you can change one word into the other by adding, deleting, or changing a single letter. A “word list” is an ordered list of unique words where successive words are adjacent. Use the official Scrabble word list as your dictionary of valid words.
Examples:
hate → love: hate, have, hove, love
dogs → wolves: dogs, does, doles, soles, solves, wolves
man → woman: man, ran, roan, roman, woman
flour → flower: flour, lour, dour, doer, dower, lower, flower
Questions
What is the shortest list between “crawl” and “run”?
What is the shortest list between “mouse” and “elephant”?
Does your program necessarily return the shortest list?
What assumptions did you make in your program?
How did you test your program?
What is the Big-O complexity of your program?
Additional Questions, answer three
Suppose each letter had a point value. Discuss (but don’t code) how your algorithm would change if you wanted to find the list with the lowest possible point total.
Sometimes the shortest list isn’t unique. Discuss (but don’t code) how your algorithm would change if you needed to return all of the shortest list between two words.
Discuss (don’t code) how you might change your program if your concern was minimizing memory usage.
Discuss (don’t code) how you might change your program if your concern was minimizing CPU time.
Discuss (don’t code) how you might change your program if your concern was minimizing programmer time.
Discuss (but don’t code) how your algorithm would change if you wanted to find the longest list between two words.
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