class Stack:
def __init__(self):
self.size = 0
self.storage = LinkedList()
def __len__(self):
return self.size
def push(self, value):
self.size += 1
self.storage.add_to_head(value)
def pop(self):
self.size -= 1
self.storage.remove_tail()
class Stack:
def __init__(self):
self.storage = LinkedList()
def __len__(self):
return self.storage.length
def push(self, value):
self.storage.add_to_tail(value)
def pop(self):
if self.storage.length == 0: return None
return self.storage.remove_tail()
class Stack:
def __init__(self):
self.size = 0
self.storage = LinkedList()
def __len__(self):
return self.size
def push(self, value):
self.storage.add_to_tail(value)
self.size += 1
def pop(self):
if self.size == 0:
return None
self.size -= 1
return self.storage.remove_tail()
class Stack:
def __init__(self):
self.size = 0
self.storage = LinkedList()
def __len__(self):
return len(self.storage)
def __str__(self):
return str(self.storage)
def push(self, value):
self.storage.add_to_tail(value)
def pop(self):
if len(self.storage) > 0:
return self.storage.remove_tail()
class LinkedListStack:
def __init__(self):
self.size = 0
self.storage = LinkedList()
# len returns the number of elements in the stack.
def __len__(self):
return self.size
# push adds an item to the top of the stack.
def push(self, value):
self.storage.add_to_tail(value)
self.size += 1
# pop removes and returns the element at the top of the stack
def pop(self):
if self.size == 0:
return None
self.size -= 1
return self.storage.remove_tail()
class Stack:
def __init__(self):
self.size = 0
self.storage = LinkedList()
self.head = None
self.tail = None
def __len__(self):
return self.size
def push(self, value):
# size of LL gets increased by 1 every time we push
self.size += 1
return self.storage.add_to_tail(value)
def pop(self):
# check if LL is empty. If so, we cannot remove an element
if self.size == 0:
return None
# if not empty, remove the tail (LIFO) and decrase the size by 1
else:
self.size -= 1
return self.storage.remove_tail()
class Stack:
def __init__(self):
self.size = 0
# Store Data through invocation of the LinkedList
self.storage = LinkedList()
def __len__(self):
# Returning the tracked size of the Linked list
return self.size
def push(self, value):
# Add to size as adding items
self.size += 1
# add item to the tail through LinkedList methods
return self.storage.add_to_tail(value)
def pop(self):
# Establish empty size of List
if self.storage.head == None:
self.size = 0
else:
# Subtract as removing items
self.size -= 1
return self.storage.remove_tail()