"Section 7: Linked List — Easy/Medium"

📚 Vanakkam DSA Course (24 sections) · Hope AI — ML & DS Course

Overview

Linked lists are a fundamental data structure. This section covers traversal, manipulation, cycle detection, and classic interview problems.

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Lessons

#	Lesson Name	Duration	Notes
1	Intro to Linked List	27m 56s
2	Design Linked List	21m 6s
3	Adding Nodes	46m 30s
4	Deleting Nodes	20m 19s
5	Middle of Linked List	21m 19s
6	Reverse Linked List	24m 31s
7	Linked List Cycle - Hash Table	26m 30s
8	Linked List Cycle - Floyd's	29m 32s
9	Palindrome Linked List	45m 31s
10	Intersection of Two Linked Lists	22m 7s
11	Remove Linked List Elements	20m+
12	Remove nth Node	—
13	Merge Two Sorted Lists	—
14	Rotate List	—

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Lesson Checklist

• [ ] Intro to Linked List (27m 56s)
• [ ] Design Linked List (21m 6s)
• [ ] Adding Nodes (46m 30s)
• [ ] Deleting Nodes (20m 19s)
• [ ] Middle of Linked List (21m 19s)
• [ ] Reverse Linked List (24m 31s)
• [ ] Linked List Cycle - Hash Table (26m 30s)
• [ ] Linked List Cycle - Floyd's (29m 32s)
• [ ] Palindrome Linked List (45m 31s)
• [ ] Intersection of Two Linked Lists (22m 7s)
• [ ] Remove Linked List Elements (20m+)
• [ ] Remove nth Node
• [ ] Merge Two Sorted Lists
• [ ] Rotate List

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My Notes

Add your personal notes, key takeaways, and insights here as you progress through the section.

Key Patterns

• Two pointer / Fast & Slow pointer — middle, cycle detection
• Dummy node — simplifies edge cases in add/remove
• Reverse in-place — iterative vs recursive

Problem Notes

Reverse Linked List

Floyd's Cycle Detection

• slow moves 1 step, fast moves 2 steps
• If they meet → cycle exists

Palindrome Linked List

• Find middle → reverse second half → compare

Merge Two Sorted Lists