Contains Duplicate

Array

Two Pointers

Trapping Rainwater

Dynamic Programming

Two Pointers

Compare Two Strings with Backspace

String

Two Pointers

Stack

Reverse Linked List II

Linked List

Two Pointers

Two pointers - Template 1

Array

Two Pointers

Template

Two pointers - Template 2

Array

Two Pointers

Template

Linked list: fast and slow pointer

Linked List

Two Pointers

Sliding Window

Array

Two Pointers

Template