Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Use python when completing the question:
Write a function interleaved that accepts two sorted sequences of numbers and returns a sorted sequence of all numbers obtained by interleaving the two sequences.
Guidelines:
- each argument is either a list or a range
- assume that each argument is sorted in non-decreasing order (goes up or stays the same, never goes down)
- you are not allowed to use sort or sorted (or any other form of sorting) in your solution
- you must interleave by iterating over the two sequences simultaneously, choosing the smallest current number from each sequence.
Output:
>>> interleaved( [-7, -2, -1], [-4, 0, 4, 8])
[-7, -4, -2, -1, 0, 4, 8]
>>> interleaved( [-4, 0, 4, 8], [-7, -2, -1])
[-7, -4, -2, -1, 0, 4, 8]
>>> interleaved( [-8, 4, 4, 5, 6, 6, 6, 9, 9], [-6, -2, 3, 4, 4, 5, 6, 7, 8])
[-8, -6, -2, 3, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 7, 8, 9, 9]
>>> interleaved( [-3, -2, 0, 2, 2, 2, 3, 3, 3], [-3, -2, 2, 3])
[-3, -3, -2, -2, 0, 2, 2, 2, 2, 3, 3, 3, 3]
>>> interleaved( [-3, -2, 2, 3], [-3, -2, 0, 2, 2, 2, 3, 3, 3])
[-3, -3, -2, -2, 0, 2, 2, 2, 2, 3, 3, 3, 3]
>>> interleaved([1,2,2],[])
[1, 2, 2]
>>> interleaved([],[1,2,2])
[1, 2, 2]
>>> interleaved([],[])
[]
>>> interleaved( range(-2,12,3), range(20,50,5) )
[-2, 1, 4, 7, 10, 20, 25, 30, 35, 40, 45]
>>> interleaved( range(20,50,5), range(-2,12,3) )==[-2, 1, 4, 7, 10, 20, 25,
30, 35, 40, 45]
True
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