From c374a57940399c37aa8c892225216400ea19eb4e Mon Sep 17 00:00:00 2001
From: Alexander Thompson <53663334+alext8900@users.noreply.github.com>
Date: Wed, 16 Sep 2020 22:07:31 -0500
Subject: [PATCH 1/5] Implemented Queue Class

array backing storage
---
 queue/queue.py | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/queue/queue.py b/queue/queue.py
index 0d2599ded7..93ae978c37 100644
--- a/queue/queue.py
+++ b/queue/queue.py
@@ -16,13 +16,18 @@
 class Queue:
     def __init__(self):
         self.size = 0
-        # self.storage = ?
+        self.storage = []
     
     def __len__(self):
-        pass
+        return len(self.storage):
 
     def enqueue(self, value):
-        pass
+        self.storage.append(value)
 
     def dequeue(self):
-        pass
+        if len(self.storage) > 0:
+            item = self.storage[0]
+            del self.storage[0]
+        else:
+            item = None
+		return item
\ No newline at end of file

From 163329e11225a0496638d0e30a6067f5db4d5255 Mon Sep 17 00:00:00 2001
From: Alexander Thompson <53663334+alext8900@users.noreply.github.com>
Date: Thu, 17 Sep 2020 01:04:34 -0500
Subject: [PATCH 2/5] Added second queue method with linked list, added stack
 and second stack method, did the linked list

---
 queue/queue.py                           | 31 ++++++++-
 queue/singly_linked_list.py              | 78 +++++++++++++++++++++++
 singly_linked_list/singly_linked_list.py | 80 ++++++++++++++++++++++++
 stack/singly_linked_list.py              | 80 ++++++++++++++++++++++++
 stack/stack.py                           | 35 +++++++++--
 5 files changed, 297 insertions(+), 7 deletions(-)
 create mode 100644 queue/singly_linked_list.py
 create mode 100644 stack/singly_linked_list.py

diff --git a/queue/queue.py b/queue/queue.py
index 93ae978c37..1c1154ed4b 100644
--- a/queue/queue.py
+++ b/queue/queue.py
@@ -13,13 +13,15 @@
 Stretch: What if you could only use instances of your Stack class to implement the Queue?
          What would that look like? How many Stacks would you need? Try it!
 """
+
+"""
 class Queue:
     def __init__(self):
         self.size = 0
         self.storage = []
-    
+
     def __len__(self):
-        return len(self.storage):
+        return len(self.storage)
 
     def enqueue(self, value):
         self.storage.append(value)
@@ -30,4 +32,27 @@ def dequeue(self):
             del self.storage[0]
         else:
             item = None
-		return item
\ No newline at end of file
+        return item
+
+"""
+from singly_linked_list import LinkedList
+
+class Queue:
+    def __init__(self):
+        self.size = 0
+        self.storage = LinkedList()
+    
+    def __len__(self):
+        return self.size
+
+    def enqueue(self, value):
+        self.storage.add_to_tail(value)
+        self.size += 1
+
+
+    def dequeue(self):
+        if self.size == 0:
+            return None
+        self.size -= 1
+        return self.storage.remove_head()   
+        
\ No newline at end of file
diff --git a/queue/singly_linked_list.py b/queue/singly_linked_list.py
new file mode 100644
index 0000000000..4a562a0ae4
--- /dev/null
+++ b/queue/singly_linked_list.py
@@ -0,0 +1,78 @@
+class Node:
+    def __init__(self, value = None, next_node = None):
+        self.value = value
+        self.next_node = next_node
+
+    def get_value(self):
+        return self.value
+
+    def get_next(self):
+        return self.next_node
+
+    def set_next(self, new_next):
+        self.next_node = new_next
+
+class LinkedList:
+    def __init__(self):
+        self.head = None
+        self.tail = None
+
+    def add_to_tail(self, value):
+        new_node = Node(value, None)
+        if not self.head:
+            self.head = new_node
+            self.tail = new_node
+        else:
+            self.tail.set_next(new_node)
+            self.tail = new_node
+
+    def remove_head(self):
+        if not self.head:
+            head = self.head
+            self.head = None
+            self.tail = None
+            return head.get_value()
+        value = self.head.get_value()
+        self.head = self.head.get_next()
+        return value
+
+    def remove_tail(self):
+        if not self.head:
+            return None
+
+        if self.head is self.tail:
+            value = self.head.get_value()
+            self.head = None
+            self.tail = None
+            return value
+
+        current = self.head
+
+        while current.get_next() is not self.tail:
+            current = current.get_next()
+
+        value = self.tail.get_value()
+        self.tail = current
+        return value
+
+    def contains(self, value):
+        if not self.head:
+            return False
+
+        current = self.head
+        while current:
+            if current.get_value() == value:
+                return True
+            current = current.get_next()
+        return False
+
+    def get_max(self):
+        if not self.head:
+            return None
+        max_value = self.head.get_value()
+        current = self.head.get_next()
+        while current:
+            if current.get_value() > max_value:
+                max_value = current.get_value()
+            current = current.get_next()                 
+        return max_value 
\ No newline at end of file
diff --git a/singly_linked_list/singly_linked_list.py b/singly_linked_list/singly_linked_list.py
index e69de29bb2..d915b46a44 100644
--- a/singly_linked_list/singly_linked_list.py
+++ b/singly_linked_list/singly_linked_list.py
@@ -0,0 +1,80 @@
+class Node:
+    def __init__(self, value=None, next_node=None):
+        self.value = value
+        self.next_node = next_node
+
+    def get_value(self):
+        return self.value
+
+    def get_next(self):
+        return self.next_node
+
+    def set_next(self, new_next):
+        self.next_node = new_next
+
+class LinkedList:
+    def __init__(self):
+        self.head = None
+        self.tail = None
+
+    def add_to_tail(self, value):
+        new_node = Node(value, None)
+        if not self.head:
+            self.head = new_node
+            self.tail = new_node
+        else:
+            self.tail.set_next(new_node)
+            self.tail = new_node
+
+    def remove_head(self):
+        if not self.head:
+            return None
+        if not self.head.get_next():
+            head = self.head
+            self.head = None
+            self.tail = None
+            return head.get_value()
+        value = self.head.get_value()
+        self.head = self.head.get_next()
+        return value
+
+    def remove_tail(self):
+        if not self.head:
+            return None
+
+        if self.head is self.tail:
+            value = self.head.get_value()
+            self.head = None
+            self.tail = None
+            return value
+
+        current = self.head
+
+        while current.get_next() is not self.tail:
+            current = current.get_next()
+
+        value = self.tail.get_value()
+        self.tail = current
+        return value
+
+    def contains(self, value):
+        if not self.head:
+            return False
+
+        current = self.head
+        while current:
+            if current.get_value() == value:
+                return True
+            current = current.get_next()
+        return False
+
+    def get_max(self):
+        if not self.head:
+            return None
+        max_value = self.head.get_value()
+        current = self.head.get_next()
+        while current:
+            if current.get_value() > max_value:
+                max_value = current.get_value()
+            current = current.get_next()
+        return max_value
\ No newline at end of file
diff --git a/stack/singly_linked_list.py b/stack/singly_linked_list.py
new file mode 100644
index 0000000000..d915b46a44
--- /dev/null
+++ b/stack/singly_linked_list.py
@@ -0,0 +1,80 @@
+class Node:
+    def __init__(self, value=None, next_node=None):
+        self.value = value
+        self.next_node = next_node
+
+    def get_value(self):
+        return self.value
+
+    def get_next(self):
+        return self.next_node
+
+    def set_next(self, new_next):
+        self.next_node = new_next
+
+class LinkedList:
+    def __init__(self):
+        self.head = None
+        self.tail = None
+
+    def add_to_tail(self, value):
+        new_node = Node(value, None)
+        if not self.head:
+            self.head = new_node
+            self.tail = new_node
+        else:
+            self.tail.set_next(new_node)
+            self.tail = new_node
+
+    def remove_head(self):
+        if not self.head:
+            return None
+        if not self.head.get_next():
+            head = self.head
+            self.head = None
+            self.tail = None
+            return head.get_value()
+        value = self.head.get_value()
+        self.head = self.head.get_next()
+        return value
+
+    def remove_tail(self):
+        if not self.head:
+            return None
+
+        if self.head is self.tail:
+            value = self.head.get_value()
+            self.head = None
+            self.tail = None
+            return value
+
+        current = self.head
+
+        while current.get_next() is not self.tail:
+            current = current.get_next()
+
+        value = self.tail.get_value()
+        self.tail = current
+        return value
+
+    def contains(self, value):
+        if not self.head:
+            return False
+
+        current = self.head
+        while current:
+            if current.get_value() == value:
+                return True
+            current = current.get_next()
+        return False
+
+    def get_max(self):
+        if not self.head:
+            return None
+        max_value = self.head.get_value()
+        current = self.head.get_next()
+        while current:
+            if current.get_value() > max_value:
+                max_value = current.get_value()
+            current = current.get_next()
+        return max_value
\ No newline at end of file
diff --git a/stack/stack.py b/stack/stack.py
index 6e6d660ac7..cd50e8fa99 100644
--- a/stack/stack.py
+++ b/stack/stack.py
@@ -10,16 +10,43 @@
 3. What is the difference between using an array vs. a linked list when 
    implementing a Stack?
 """
+
+"""
 class Stack:
     def __init__(self):
         self.size = 0
-        # self.storage = ?
+        self.storage = []
 
     def __len__(self):
-        pass
+        return self.size
+
+    def push(self, value):
+        self.size += 1
+        self.storage.append(value)
 
+    def pop(self):
+        if self.size == 0:
+            return None
+        self.size -= 1
+        return self.storage.pop()
+
+"""
+from singly_linked_list import LinkedList
+
+class Stack:
+    def __init__(self):
+        self.size = 0
+        self.storage = LinkedList()
+
+    def __len__(self):
+        return self.size
+    
     def push(self, value):
-        pass
+        self.size += 1
+        self.storage.add_to_tail(value)
 
     def pop(self):
-        pass
+        if self.size == 0:
+            return None
+        self.size -= 1
+        return self.storage.remove_tail()

From 2c79eef09deaf06d8a0b4775b4188e7464750d21 Mon Sep 17 00:00:00 2001
From: Alexander Thompson <53663334+alext8900@users.noreply.github.com>
Date: Sat, 19 Sep 2020 12:02:57 -0500
Subject: [PATCH 3/5] Completed lsitNode Class

---
 doubly_linked_list/doubly_linked_list.py | 25 +++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/doubly_linked_list/doubly_linked_list.py b/doubly_linked_list/doubly_linked_list.py
index 6f91b43a9b..9206b8dcdc 100644
--- a/doubly_linked_list/doubly_linked_list.py
+++ b/doubly_linked_list/doubly_linked_list.py
@@ -7,7 +7,30 @@ def __init__(self, value, prev=None, next=None):
         self.prev = prev
         self.value = value
         self.next = next
-            
+
+    def get_value(self):
+        return self.value
+
+    def get_next(self):
+        if self.next:
+            return self.next
+        else:
+            return None
+
+    def get_prev(self):
+        if self.prev:
+            return
+        else:
+            return None
+
+    def delete(self):
+        if self.prev:
+            self.prev.next = self.next
+        if self.next:
+            self.next.prev = self.prev
+        self.value
+        self.next
+        self.prev = None
 """
 Our doubly-linked list class. It holds references to 
 the list's head and tail nodes.

From 067e576cdf79a3ab1eb7b61ed79108cbef67e7fa Mon Sep 17 00:00:00 2001
From: Alexander Thompson <53663334+alext8900@users.noreply.github.com>
Date: Sat, 19 Sep 2020 12:52:23 -0500
Subject: [PATCH 4/5] Finished writing the doubly linked list, but getting some
 failures im working on fixing

---
 doubly_linked_list/doubly_linked_list.py | 108 ++++++++++++++++++++---
 1 file changed, 96 insertions(+), 12 deletions(-)

diff --git a/doubly_linked_list/doubly_linked_list.py b/doubly_linked_list/doubly_linked_list.py
index 9206b8dcdc..9987734329 100644
--- a/doubly_linked_list/doubly_linked_list.py
+++ b/doubly_linked_list/doubly_linked_list.py
@@ -17,9 +17,9 @@ def get_next(self):
         else:
             return None
 
-    def get_prev(self):
+    def get_previous(self):
         if self.prev:
-            return
+            return self.prev
         else:
             return None
 
@@ -28,8 +28,8 @@ def delete(self):
             self.prev.next = self.next
         if self.next:
             self.next.prev = self.prev
-        self.value
-        self.next
+        self.value = None
+        self.next = None
         self.prev = None
 """
 Our doubly-linked list class. It holds references to 
@@ -50,7 +50,15 @@ def __len__(self):
     the old head node's previous pointer accordingly.
     """
     def add_to_head(self, value):
-        pass
+        root = ListNode(value)
+        if self.head and self.tail:
+            root.next = self.head
+            self.head.prev = root
+            self.head = root
+        else:
+            self.head = root
+            self.tail = root
+        self.length += 1
         
     """
     Removes the List's current head node, making the
@@ -58,7 +66,22 @@ def add_to_head(self, value):
     Returns the value of the removed Node.
     """
     def remove_from_head(self):
-        pass
+        if self.head:
+            headValue = self.head.get_value()
+            if self.length > 1:
+                newHead = self.head.get_next()
+                self.head.delete()
+                self.head = newHead
+                self.length -= 1
+                return headValue
+            else:
+                self.head.delete()
+                self.head = None
+                self.tail = None
+                self.length -= 1
+                return headValue
+        else:
+            return None
             
     """
     Wraps the given value in a ListNode and inserts it 
@@ -66,7 +89,15 @@ def remove_from_head(self):
     the old tail node's next pointer accordingly.
     """
     def add_to_tail(self, value):
-        pass
+        endNode = ListNode(value)
+        if self.head and self.tail:
+            endNode.prev = self.head
+            self.tail.next = endNode
+            self.tail = endNode
+        else:
+            self.head = endNode
+            self.tail = endNode
+        self.length += 1
             
     """
     Removes the List's current tail node, making the 
@@ -74,32 +105,85 @@ def add_to_tail(self, value):
     Returns the value of the removed Node.
     """
     def remove_from_tail(self):
-        pass
+        if self.tail:
+            tailValue = self.tail.get_value()
+            if self.length > 1:
+                newTail = self.tail.get_previous()
+                self.tail.delete()
+                self.tail = newTail
+                self.length -= 1
+                return tailValue
+            else:
+                self.tail.delete()
+                self.tail = None
+                self.head = None
+                self.length -= 1
+                return tailValue
+        else:
+             return None
             
     """
     Removes the input node from its current spot in the 
     List and inserts it as the new head node of the List.
     """
     def move_to_front(self, node):
-        pass
+        value = node.value
+        if node == self.head:
+            return
+        elif node == self.tail:
+            self.remove_from_tail()
+            self.add_to_head(value)
+        else:
+            self.delete(node)
+            self.add_to_head(value)
         
     """
     Removes the input node from its current spot in the 
     List and inserts it as the new tail node of the List.
     """
     def move_to_end(self, node):
-        pass
+        value = node.value
+        if node == self.tail:
+            return
+        elif node == self.head:
+            self.remove_from_head()
+            self.add_to_tail(value)
+        else:
+            self.delete(node)
+            self.add_to_tail(value)
 
     """
     Deletes the input node from the List, preserving the 
     order of the other elements of the List.
     """
     def delete(self, node):
-        pass
+        if self.length == 0:
+            return
+        elif self.length == 1:
+            self.head = None
+            self.tail = None
+            node.delete()
+            self.length -= 1
+        elif self.head == node:
+            self.remove_from_head()
+        elif self.tail == node:
+            self.remove_from_tail()
+        else:
+            node.delete()
+            self.length -= 1 
 
     """
     Finds and returns the maximum value of all the nodes 
     in the List.
     """
     def get_max(self):
-        pass
\ No newline at end of file
+        if not self.head:
+            return None
+        max_value = self.head.value
+        current_node = self.head
+        while current_node:
+            if current_node.value > max_value:
+                max_value = current_node.value
+            current_node = current_node.get_next()
+
+        return max_value
\ No newline at end of file

From fe2f6e45e60ff86d6e9209333967bf9149ffa34b Mon Sep 17 00:00:00 2001
From: Alexander Thompson <53663334+alext8900@users.noreply.github.com>
Date: Sat, 19 Sep 2020 12:53:53 -0500
Subject: [PATCH 5/5] Found where i made a mistake and now the test runs fine

---
 doubly_linked_list/doubly_linked_list.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doubly_linked_list/doubly_linked_list.py b/doubly_linked_list/doubly_linked_list.py
index 9987734329..5c42c640c2 100644
--- a/doubly_linked_list/doubly_linked_list.py
+++ b/doubly_linked_list/doubly_linked_list.py
@@ -91,7 +91,7 @@ def remove_from_head(self):
     def add_to_tail(self, value):
         endNode = ListNode(value)
         if self.head and self.tail:
-            endNode.prev = self.head
+            endNode.prev = self.tail
             self.tail.next = endNode
             self.tail = endNode
         else: