Company preparation
Google preparation guide
Make the reasoning visible at every step.
Understand the problem
Clarify ambiguity, test examples, and discuss alternative approaches before committing. Explain correctness and complexity, and respond constructively when constraints change. Confirm round details with the recruiter.
Make it concrete
If memory becomes constrained, revisit whether sorting can replace a hash-based approach.
Trade-offs and pitfalls
A fast answer is less useful when its assumptions are not stated.
Check your understanding
Practice changing a solution after an interviewer adds a new constraint.
Practice this topic