CONCEPT BLOGS
Multi-phase guides with mental models, worked examples, diagrams, and real edge cases — the public form of Learnisim AI's conceptual learning. Read here; train it interactively in the app.
![Triplets in [-1, 0, 1, 2, -1, -4] overview diagram](/blogs/3sum-with-duplicate-skipping-explained-tracing-1-0-1-2-1-4/diagrams/hero.svg)
Learn 3Sum with duplicate skipping by tracing [-1, 0, 1, 2, -1, -4] step-by-step. Build a rock-solid mental model of sorting and two-pointer traversal.
Master space complexity by tracing memory use in a worked example. Understand the model, avoid common pitfalls, and predict real-world bottlenecks with confidence.
Master Big O notation by focusing on growth rates and dominant terms. See a step-by-step derivation from code, practice with nested loops, and apply your knowledge to predict real-world performance.
