🌳 Interview Prep
Trees, Graphs & DP
Trees, heaps, tries, graphs, backtracking and dynamic programming: what separates a pass from a strong pass at big tech.
📘 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.