Answered: First List three key points of the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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First List three key points of the dynamic programming problem-solving technique with a short description for each key point

Then take the Levenshtein edit distance code snippet below as an example to illustrate how three key points of the dynamic programming technique you listed above are applied in Levenshtein's solution. You may refer to the line number to explain your points

1 def editDistanceDP (s1, s2, m, n, memo) :
if memo [m] [n] > -1: return memo [m] [n]
if m == 0: memo [m] [n] = n; return memo [m] [n]
if n == 0 : memo [m] [n]
if s1[m-1]
2
3
4
= m; return memo [m] [n]
s2 [n-1] :
= editDistanceDP (s1, s2, m-1, n-1, memo)
==
6.
memo [m] [n]
return memo [m] [n]
memo [m] [n] = 1 + min (editDistanceDP (s1, 32, m, n-1, memo),\
7
editDistanceDP (s1, s 2, m-1, n, memo),
editDistanceDP (s1, s2, m-1, n-1, memo))
10
11
return memo [m] [n]

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