The Complete Guide to Solving Question 1: Methods, Code, and Logic
Algorithm optimization is not about memorizing syntax tricks. It reflects an engineer's instinct for resource efficiency. Mastering Question 1 provides a clean mental template that extends across dozens of harder problems, including Three Sum, Subarray Sum Equals K, and complex graph lookups. When you see an array search problem, stop reaching for nested iterations. Map the complement, leverage your auxiliary memory, and let constant-time lookups do the heavy lifting.
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solve question 1