Leetcode Data Structures and Algorithms Crash Course

This repository contains notes and examples for the Leetcode Data Strucutures and Algorithms Crash Course.

Data Structure

Arrays and strings

1. Two pointers Approach: Solve an array problem in O(n) time complexity.
2. Sliding Window Approach: Solve finding a valid (longest) subarray in O(n) time complexity.
3. Prefix Sum:

Hashing

1. Checking for the existence
2. Counting

Stacks and queues

Algorithms