DSA · Theory

Arraylist vs linked list

← All stacks

Theory

366/810

Arraylist vs linked list

Meera only reaches for Arraylist vs linked list when a ticket queue node has to stay correct in a counter.

Arraylist vs linked list on the board — head → next → …. Then say what a ticket queue node looks like after.

Arraylist vs linked list exists so Meera can keep a ticket queue node correct in a counter.

Use Arraylist vs linked list when a ticket queue node must stay clear. If a simpler DSA step works, use that instead.

Arraylist vs linked list miss — losing the next pointer on delete. Fix it before you talk about advanced DSA.

Arraylist vs linked list is not a lonely heading. Meera ties it to a ticket queue node.

One breath for Arraylist vs linked list, then a ticket queue node, then losing the next pointer on delete. Sit down.

Diagram

  [10] → [20] → [30] → /
   head              tail

Exam tip

Say Arraylist vs linked list in one breath, then head → next → …, then losing the next pointer on delete.

Example

class Node:
    def __init__(self, val, next=None):
        self.val = val
        self.next = next

head = Node(1, Node(2, Node(3)))
cur = head
while cur:
    print(cur.val, end=" -> " if cur.next else "\n")
    cur = cur.next

Arraylist vs linked list — a linked list chains nodes with next pointers instead of contiguous indexes.

Short notes

DefArraylist vs linked list — Meera uses it for a ticket queue node in a counter.
RuleArraylist vs linked list → head → next → ….
RememberArraylist vs linked list + Big-O (a counter).
UseArraylist vs linked list in a counter (a ticket queue node).
TrapArraylist vs linked list — losing the next pointer on delete.
ExArraylist vs linked list → a ticket queue node.

class Node: def __init__(self, val, next=None): self.val = val self.next = next head = Node(1, Node(2, Node(3))) cur = head while cur: print(cur.val, end=" -> " if cur.next else "\n") cur = cur.next

Arraylist vs linked list

Example

Short notes

Questions

Arraylist vs linked list

Example

Short notes

Questions