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Arrays & Two Pointers
10 problems · Easy to Hard · Arrays and two-pointer patterns
Arrays are the most common data structure in technical interviews, and the two-pointer technique is one of the highest-leverage patterns you can learn. This track starts with warm-up problems on in-place manipulation and builds to multi-pointer problems like 3Sum, 4Sum, and the generalized KSum framework.
Why it matters:
Interviewers use array problems to test whether you can optimize from O(n²) brute force to O(n) using pointer movement and sorting. Recognizing when to apply two pointers — and knowing which direction to move them — is a skill that transfers across dozens of problem types beyond this track.
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