🧮 Interview Prep
Core Algorithms
Arrays, strings, hash maps, two pointers, sliding windows, stacks, binary search and linked lists: the coding rounds at almost every company.
📘 Learn it from scratch
Visual, hands-on lessons for every pattern in this topic. Do the lesson, then come back and the questions click.
100 questions, most asked first
Ranked by how often each question comes up in real interviews. #1 is the most common.