DSA · Theory

Linked List Deletion (Deleting a key at a given position)

Theory

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Linked List Deletion (Deleting a key at a given position)

Linked List Deletion (Deleting a key at a given position) sits in a counter. Dev’s job is a ticket queue node. Write that first.

For Linked List Deletion (Deleting a key at a given position), Big-O is in play. Don’t blame it until you have traced a ticket queue node.

Linked List Deletion (Deleting a key at a given position) exists so Dev can keep a ticket queue node correct in a counter.

Linked List Deletion (Deleting a key at a given position) shows up in a counter. Name a ticket queue node, not “a real-world scenario”.

Don’t do this with Linked List Deletion (Deleting a key at a given position): losing the next pointer on delete. Interviewers spot it in ten seconds.

Linked List Deletion (Deleting a key at a given position) is not a lonely heading. Dev ties it to a ticket queue node.

Close Linked List Deletion (Deleting a key at a given position) with: “If I skip it, a ticket queue node goes wrong like this: losing the next pointer on delete.”

Diagram

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

Exam tip

For Linked List Deletion (Deleting a key at a given position): definition + a counter + one failure.

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

Linked List Deletion (Deleting a key at a given position) — a linked list chains nodes with next pointers instead of contiguous indexes.

Short notes

DefLinked List Deletion (Deleting a key at a given position) — Dev uses it for a ticket queue node in a counter.
RuleLinked List Deletion (Deleting a key at a given position) → head → next → ….
RememberLinked List Deletion (Deleting a key at a given position) + Big-O (a counter).
UseLinked List Deletion (Deleting a key at a given position) in a counter (a ticket queue node).
TrapLinked List Deletion (Deleting a key at a given position) — losing the next pointer on delete.
ExLinked List Deletion (Deleting a key at a given position) → 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

Linked List Deletion (Deleting a key at a given position)

Example

Short notes

Questions

Linked List Deletion (Deleting a key at a given position)

Example

Short notes

Questions