Two Sum

Array

Hash Table

Contains Duplicate

Array

Two Pointers

Product Except Self

Array

The Sign of an Array

Array

Arithmetic Progression

Array

Maximum Sub-array

Array

Divide and Conquer

Dynamic Programming

First Missing Possitive

Array

Find Peak Element

Array

Search

Coin Change

Array

Dynamic Programming

Best Time to Buy and Sell Stocks

Array

Dynamic Programming

Binary Search

Array

Search

Array

Class

Array

Data Structure

Sorted Array to a Binary Search Tree

Array

Search

Tree

BST

Two pointers - Template 1

Array

Two Pointers

Template

Two pointers - Template 2

Array

Two Pointers

Template

Prefix Sum

Array

Template

Efficient string building

Array

String

Template

Find number of subarrays that fit an exact criteria

Array

Template

Monotonic increasing stack

Array

Stack

Template

Sliding Window

Array

Two Pointers

Template