Two Sum is the single most asked interview problem in existence. Google has asked it over times in recent years. Amazon, Meta, Microsoft, Apple, and Bloomberg all ask it regularly. Why do interviewers love it? It's a perfect litmus test. If you can't solve Two Sum in - minutes, you're not ready for harder problems. It also has multiple valid solutions (brute force, sorting, hash map), so interviewers can see how you think about trade-offs. Expect follow-ups like: "What if the array is sorted?" (two pointers), "What if there are multiple pairs?" (return all), or "What about Sum?" (which you'll learn next section).
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$ curl repovive.com/roadmaps/maang-interview-prep/arrays-hashing/two-sum-why-this-problem
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