DSA · Theory

Intersection of Linked List

Theory

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Intersection of Linked List

If you can teach Intersection of Linked List using a ticket queue node, you know it. If you only know the heading, you don’t.

Intersection of Linked List order — meaning → head → next → … → one limit. Dumping ten features helps nobody.

Without Intersection of Linked List, a counter gets messy and a ticket queue node is hard to trust.

Use Intersection of Linked List when a ticket queue node must stay clear. If a simpler DSA step works, use that instead.

If a ticket queue node breaks under Intersection of Linked List, check losing the next pointer on delete first.

Intersection of Linked List is not a lonely heading. Amit ties it to a ticket queue node.

One breath for Intersection of Linked List, then a ticket queue node, then losing the next pointer on delete. Sit down.

Diagram

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

Exam tip

Board: a ticket queue node. Dry-run Intersection of Linked List. Name the trap: 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

Intersection of Linked List — a linked list chains nodes with next pointers instead of contiguous indexes.

Short notes

DefIntersection of Linked List — Amit uses it for a ticket queue node in a counter.
RuleIntersection of Linked List → head → next → ….
RememberIntersection of Linked List + Big-O (a counter).
UseIntersection of Linked List in a counter (a ticket queue node).
TrapIntersection of Linked List — losing the next pointer on delete.
ExIntersection of 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

Intersection of Linked List

Example

Short notes

Questions

Intersection of Linked List

Example

Short notes

Questions