The O(n) Club: Odd Even Linked List: When Indices, Not Values, Go Rogue
The O(n) Club: Odd Even Linked List — When Indices, Not Values, Go Rogue ⚡ TL;DR Don’t confuse “odd” with funky node values: This is about…
The O(n) Club: Reorder List: When Your Linked List Needs a Hollywood Makeover (Pointer Edition)
The O(n) Club: Reorder List — When Your Linked List Needs a Hollywood Makeover (Pointer Edition) ⚡ TL;DR Want to glam up your linked list so…
The O(n) Club: Swap Nodes in Pairs — No, You Can’t Just Swap Values
The O(n) Club: Swap Nodes in Pairs — No, You Can’t Just Swap Values ⚡ TL;DR Take a singly linked list and actually swap every pair of…
The O(n) Club: Reverse Linked List II — Now With 100% More Pointer Regret
The O(n) Club: Reverse Linked List II — Now With 100% More Pointer Regret ⚡ TL;DR A classic linked list headache: given a 1-indexed singly…
The O(n) Club: Add Two Numbers, Linked Lists, and That Sneaky Carry
The O(n) Club: Add Two Numbers, Linked Lists, and That Sneaky Carry ⚡ TL;DR Two linked lists. Digits in reverse. Add ’em, digit by…
The O(n) Club: Sort List—Where Linked Lists and Merge Sort Go Full Buddy Cop
The O(n) Club: Sort List—Where Linked Lists and Merge Sort Go Full Buddy Cop ⚡ TL;DR LeetCode 148 wants you to sort a singly linked list.…
The O(n) Club: Reverse Nodes in K-Group: Now You’re Juggling Pointers and Sanity
The O(n) Club: Reverse Nodes in K-Group — Now You’re Juggling Pointers and Sanity ⚡ TL;DR Reverse your singly-linked list in groups of k…
The O(n) Club: Flatten Binary Tree to Linked List, Minus the Screaming
The O(n) Club: Flatten Binary Tree to Linked List, Minus the Screaming ⚡ TL;DR Take your binary tree and wrestle it into a right-child-only…
The O(n) Club: Palindrome Linked List: Sanity-Check Edition—Because Lists Deserve Symmetry Too
The O(n) Club: Palindrome Linked List—Sanity-Check Edition ⚡ TL;DR Want to see if your singly linked list reads the same from both ends, but…
The O(n) Club: Remove Nth Node From End—Don’t Lose Your Head (Literally)
The O(n) Club: Remove Nth Node From End—Don’t Lose Your Head (Literally) ⚡ TL;DR Delete the nth node from the end of a singly linked list—no…