Below you're given a Node class and a LinkedList class. You will implement a method for the LinkedList class named "delete48in148". That is, whenever there is a sequence of nodes with values 1, 4, 8, we delete the 4 and 8. For example,
Below you're given a Node class and a LinkedList class. You will implement a method for the LinkedList class named "delete48in148". That is, whenever there is a sequence of nodes with values 1, 4, 8, we delete the 4 and 8. For example,
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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Transcribed Image Text:Below you're given a Node class and a LinkedList class. You will implement a
method for the LinkedList class named "delete48in148". That is, whenever there
is a sequence of nodes with values 1, 4, 8, we delete the 4 and 8. For exCample,
Before: 1 -> 4 -> 8
LAfter: 1
Before: 7 -> 1 -> 4 -> 8 -> 9 -> 4 -> 8
After: 7 -> 1 -> 9 -> 4 -> 8
Before: 7 -> 1 -> 4 -> 8 -> 4 -> 8 -> 4 -> 8 -> 9
After: 7 -> 1 -> 9
Note from the above example that, after deleting one instance of 48, there
may be new instances of 148 formed. You must delete ALL of them.
Requirement: Your implementation must be ITERATIVE (i.e., using a loop).
You must NOT use recursion. Recursive solutions will NOT be given marks.
import
...
# No other import is allowed
![class Node:
A node in the linked List
value: int
next: Optional (Node]
definit_ (self, value: int, nx: Node = None):
self.value = value
self.next = nx
class LinkedList:
The LinkedList is empty if and only if self.head is None
head: Optional (Node]
def init_(self, head: Optional [Node]):
self.head = head
def delete48in148(self) -> None:
In all occurrences of 148, delete the 48.
TODO: complete this method
Your implementation must be ITERATIVE (1.e., using a loop).
You must NOT use recursion.
Recursive solutions will NOT be given marks.
pass](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F50700bcb-7eae-4627-8f9a-d21c0cbd1fac%2Fec6d7754-4eba-4742-8c35-a99343e79b4b%2F6eift9b_processed.png&w=3840&q=75)
Transcribed Image Text:class Node:
A node in the linked List
value: int
next: Optional (Node]
definit_ (self, value: int, nx: Node = None):
self.value = value
self.next = nx
class LinkedList:
The LinkedList is empty if and only if self.head is None
head: Optional (Node]
def init_(self, head: Optional [Node]):
self.head = head
def delete48in148(self) -> None:
In all occurrences of 148, delete the 48.
TODO: complete this method
Your implementation must be ITERATIVE (1.e., using a loop).
You must NOT use recursion.
Recursive solutions will NOT be given marks.
pass
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