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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help me understand this please (this is not exam question, its from online textrbook)

This question is about array lists and linked lists.
In the first question part we consider linked lists which are sequences of connected nodes,
taken from the class below.
class Node:
def __init__(self, d, n):
self.data = d
self.next = n
The data stored are integers.
(a) You are asked to solve the following pointer game. Starting from this initial configuration:
1s1
182
1
2
3
4
5
6
perform the following sequence of operations and draw the final configuration.
1s1 = Node (1,1s1)
ptr = ls1
ptr2 = 1s2
while ptr != None:
if ptr.data != ptr2.data: ptr2.data
else: ptr2.data
= = 0
ptr = ptr. next
ptr2 = ptr2.next
7
=
ptr.data
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Transcribed Image Text:This question is about array lists and linked lists. In the first question part we consider linked lists which are sequences of connected nodes, taken from the class below. class Node: def __init__(self, d, n): self.data = d self.next = n The data stored are integers. (a) You are asked to solve the following pointer game. Starting from this initial configuration: 1s1 182 1 2 3 4 5 6 perform the following sequence of operations and draw the final configuration. 1s1 = Node (1,1s1) ptr = ls1 ptr2 = 1s2 while ptr != None: if ptr.data != ptr2.data: ptr2.data else: ptr2.data = = 0 ptr = ptr. next ptr2 = ptr2.next 7 = ptr.data
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