From 4e34ba44e5ba977d67eb0b8841451ade6f40c580 Mon Sep 17 00:00:00 2001 From: Droid-An Date: Mon, 13 Oct 2025 17:05:32 +0100 Subject: [PATCH] done linked list --- Sprint-2/implement_linked_list/linked_list.py | 50 +++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/Sprint-2/implement_linked_list/linked_list.py b/Sprint-2/implement_linked_list/linked_list.py index e69de29..aad4acb 100644 --- a/Sprint-2/implement_linked_list/linked_list.py +++ b/Sprint-2/implement_linked_list/linked_list.py @@ -0,0 +1,50 @@ +class LinkedList: + def __init__(self): + self.head = None + self.tail = None + + def push_head(self, element): + node = Node(element) + if self.head and self.tail: + node.next = self.head + self.head.previous = node + self.head = node + elif not self.head and not self.tail: + self.head = node + self.tail = node + return node + + def pop_tail(self): + node = self.tail + if self.tail is not self.head: + self.tail = node.previous + node.previous.next = None + node.previous = None + else: + self.head = None + self.tail = None + return node.value + + def remove(self, node): + if self.head != node and self.tail != node: + node.previous.next = node.next + node.next.previous = node.previous + node.previous, node.next = None, None + elif self.head == node and self.tail != node: + node.next.previous = None + self.head = node.next + node.previous, node.next = None, None + elif self.head != node and self.tail == node: + node.previous.next = None + self.tail = node.previous + node.previous, node.next = None, None + elif self.head == node and self.tail == node: + self.head = None + self.tail = None + + +class Node: + def __init__(self, value): + self.value = value + self.previous = None + self.next = None