266. Palindrome Permutation

2095. Delete The Middle Node Of A Linked List

Two Pointers Linked List

424. Longest Repeating Character Replacement

234. Palindrome Linked List

82. Remove Duplicates From Sorted List Ii

Min Stack

706. Design Hashmap

Intersection Of Two Linked Lists

69. Sqrtx

Min Cost Climbing Stairs

Number Of Islands

Array Depth-First Search Breadth-First Search Matrix Union Find

547. Number Of Provinces

21. Merge Two Sorted Lists

Linked List

19. Remove Nth Node From End Of List

Linked List

9. Palindrome Number

String

2. Add Two Numbers

Linked List

Valid Parentheses

HashTable Stack

1. Two Sum

Array HashTable

Instead of learning solutions of LeetCode questions, understand patterns!

Instead of learning solutions of LeetCode questions, understand patterns!

FAANG Strategy Tips

DoublyLinkedList Design (with bidirectional search to perform faster)

Node.next - Value - Node.prev Actions: addAtHead, addAtTail, get, deleteAt, addAtIndex

Linked List