Stack Using Linked List vs Array Stack Trade-offs in DSA Python - Interactive Comparison Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to push an element onto an array-based stack.

DSA Python

def push(stack, element):
    stack.[1](element)

Drag options to blanks, or click blank then click option'

Ainsert

Bpop

Cremove

Dappend

Attempts:

3 left

💡 Hint

Common Mistakes

Using pop instead of append

Using insert which adds at the start

We use append to add an element at the end of the list, simulating push in an array stack.

2fill in blank

medium

Complete the code to pop an element from a linked list based stack.

DSA Python

def pop(head):
    if head is None:
        return None, None
    popped_value = head.data
    head = head.[1]
    return popped_value, head

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Aprev

Bnext

Cdata

Dhead

Attempts:

3 left

💡 Hint

Common Mistakes

Using prev which is for doubly linked lists

Using data which is the value, not the link

In a linked list stack, head.next points to the next node after popping the top.

3fill in blank

hard

Fix the error in the array stack size check before pushing.

DSA Python

def push(stack, element, max_size):
    if len(stack) [1] max_size:
        return "Stack Overflow"
    stack.append(element)
    return stack

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A==

B<

C>=

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' which allows overflow

Using '==' which misses overflows

We check if the stack length is greater than or equal to max size to prevent overflow.

4fill in blank

hard

Fill both blanks to check if a linked list stack is empty and to push a new node.

DSA Python

def push(head, element):
    new_node = Node(element)
    if head is [1]:
        head = new_node
    else:
        new_node.[2] = head
        head = new_node
    return head

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ANone

Bhead

Cnext

Dprev

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'head' instead of None for empty check

Using 'prev' instead of 'next' for linking

We check if head is None to see if stack is empty. Then set new_node.next to head to link nodes.

5fill in blank

hard

Fill all three blanks to create a dictionary showing trade-offs: keys are 'ArrayStack' and 'LinkedListStack', values are their main advantage.

DSA Python

trade_offs = {
    '[1]': 'Fast access',
    '[2]': 'Dynamic size',
}

print(trade_offs['[3]'])

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AArrayStack

BLinkedListStack

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing keys and values

Printing wrong key's value

ArrayStack has fast access due to contiguous memory. LinkedListStack has dynamic size. The print accesses ArrayStack's advantage.