From 4b82230d3c54571b8e5f47e5b0c62412550c2f72 Mon Sep 17 00:00:00 2001
From: Zobeir-Rigi <rigi.zobir@yahoo.com>
Date: Mon, 6 Jul 2026 00:48:15 +0100
Subject: [PATCH 1/3] Implement linked list

---
 Sprint-2/implement_linked_list/linked_list.py | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/Sprint-2/implement_linked_list/linked_list.py b/Sprint-2/implement_linked_list/linked_list.py
index e69de29..0dfbb5c 100644
--- a/Sprint-2/implement_linked_list/linked_list.py
+++ b/Sprint-2/implement_linked_list/linked_list.py
@@ -0,0 +1,53 @@
+class Node:
+    def __init__(self, value):
+        self.value = value
+        self.next = None
+        self.previous = None
+
+
+class LinkedList:
+    def __init__(self):
+        self.head = None
+        self.tail = None
+
+    def push_head(self, value):
+        node = Node(value)
+
+        if self.head is None:
+            self.head = node
+            self.tail = node
+        else:
+            node.next = self.head
+            self.head.previous = node
+            self.head = node
+
+        return node
+
+    def pop_tail(self):
+        if self.tail is None:
+            return None
+
+        value = self.tail.value
+
+        if self.head == self.tail:
+            self.head = None
+            self.tail = None
+        else:
+            self.tail = self.tail.previous
+            self.tail.next = None
+
+        return value
+
+    def remove(self, node):
+        if node.previous is not None:
+            node.previous.next = node.next
+        else:
+            self.head = node.next
+
+        if node.next is not None:
+            node.next.previous = node.previous
+        else:
+            self.tail = node.previous
+
+        node.next = None
+        node.previous = None
\ No newline at end of file

From 4b6da1249f16cdb0e0146edbd19b62ab308b943e Mon Sep 17 00:00:00 2001
From: Zobeir-Rigi <rigi.zobir@yahoo.com>
Date: Tue, 14 Jul 2026 18:22:34 +0100
Subject: [PATCH 2/3] Refactor linked list implementation

---
 Sprint-2/implement_linked_list/linked_list.py | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/Sprint-2/implement_linked_list/linked_list.py b/Sprint-2/implement_linked_list/linked_list.py
index 0dfbb5c..931fbf3 100644
--- a/Sprint-2/implement_linked_list/linked_list.py
+++ b/Sprint-2/implement_linked_list/linked_list.py
@@ -1,4 +1,6 @@
 class Node:
+    __slots__ = ("value", "next", "previous")
+
     def __init__(self, value):
         self.value = value
         self.next = None
@@ -27,14 +29,10 @@ def pop_tail(self):
         if self.tail is None:
             return None
 
-        value = self.tail.value
+        node = self.tail
+        value = node.value
 
-        if self.head == self.tail:
-            self.head = None
-            self.tail = None
-        else:
-            self.tail = self.tail.previous
-            self.tail.next = None
+        self.remove(node)
 
         return value
 

From bc6f068f3442b39ec70fe5918b73650eb188aeb5 Mon Sep 17 00:00:00 2001
From: Zobeir-Rigi <rigi.zobir@yahoo.com>
Date: Tue, 14 Jul 2026 18:50:55 +0100
Subject: [PATCH 3/3] Refactor linked list implementation

---
 Sprint-2/implement_linked_list/linked_list.py | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/Sprint-2/implement_linked_list/linked_list.py b/Sprint-2/implement_linked_list/linked_list.py
index 931fbf3..f0d39af 100644
--- a/Sprint-2/implement_linked_list/linked_list.py
+++ b/Sprint-2/implement_linked_list/linked_list.py
@@ -48,4 +48,21 @@ def remove(self, node):
             self.tail = node.previous
 
         node.next = None
-        node.previous = None
\ No newline at end of file
+        node.previous = None
+
+    def move_to_head(self, node):
+        if node == self.head:
+            return
+
+        self.remove(node)
+
+        node.previous = None
+        node.next = self.head
+
+        if self.head is not None:
+            self.head.previous = node
+
+        self.head = node
+
+        if self.tail is None:
+            self.tail = node
\ No newline at end of file