Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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3. Design a dynamic programming algorithm for the Longest Alternating Subsequence problem
described below:
Input: A sequence of n integers
Output: The longest subsequence where the numbers alternate between being larger and smaller than
their predecessor
The algorithm must take O(n) time. You must also write and explain the recurrence.
Example 1:
Input: [3, 5, 4, 1, 3, 6, 5, 7, 3, 4]
Output: [3, 5, 4, 6, 5, 7, 3, 4]
Example 2:
Input: [4, 7, 2, 5, 8, 3, 8, 0, 4, 7, 8]
Output: [4, 7, 2, 5, 3, 8, 0, 4]

Write in Pseudocode, please

3. Design a dynamic programming algorithm for the Longest Alternating Subsequence problem
described below:
Input: A sequence of n integers
Output: The longest subsequence where the numbers alternate between being larger and smaller than
their predecessor
The algorithm must take O(n) time. You must also write and explain the recurrence.
Example 1:
Input: [3, 5, 4, 1, 3, 6, 5, 7, 3, 4]
Output: [3,5, 4, 6, 5, 7, 3, 4]
Example 2:
Input: [4, 7, 2,5,8, 3, 8, 0, 4, 7, 8]
Output: [4,7, 2, 5, 3, 8,0, 4]
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Transcribed Image Text:3. Design a dynamic programming algorithm for the Longest Alternating Subsequence problem described below: Input: A sequence of n integers Output: The longest subsequence where the numbers alternate between being larger and smaller than their predecessor The algorithm must take O(n) time. You must also write and explain the recurrence. Example 1: Input: [3, 5, 4, 1, 3, 6, 5, 7, 3, 4] Output: [3,5, 4, 6, 5, 7, 3, 4] Example 2: Input: [4, 7, 2,5,8, 3, 8, 0, 4, 7, 8] Output: [4,7, 2, 5, 3, 8,0, 4]
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