Subarray Sum Equals K || Leetcode 560 || 2 Variant Questions Big Tech Actually Asks

Discover the actual variants Meta asks on Leetcode problem 560: Subarray Sum Equals K.

Timestamps:
00:00 Leetcode Explanation
19:42 Leetcode Coding
21:10 Variant #1 Explanation: True or False?
24:48 Variant #1 Coding: True or False?
25:55 Variant #2 Explanation: Only Positive Numbers
30:11 Variant #2 Coding: Only Positive Numbers

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More Context:
FAANG, mid-sized companies, and startups are asking more LeetCode-style puzzle questions every day, making it harder to stand out as the competition grows. With an increasing number of new graduates entering the software market and tech companies laying off developers while overworking those who remain, it’s a tough landscape. Take Meta, for example: they expect 2-3 months of intense study time, only to likely ghost you afterward. But this doesn’t mean we should be unprepared.

While LeetCode is a valuable learning resource, many developers focus too much on rote memorization. Others find themselves stuck in a vicious cycle, where they don’t study as efficiently as they could because they’re juggling multiple responsibilities. They have full-time jobs, personal commitments, or other obligations that limit the time they can dedicate to solving problems. It’s a grind. Unfortunately, most companies introduce their own twists or "variants" of common problems (e.g., 6-sum instead of 2-sum), which throw candidates off. Rephrasings of problems and follow-up questions are also common, so recognizing these variations and curveballs is crucial.

For those who don’t have the time to revisit LeetCode problems multiple times to solidify concepts, this channel covers the most frequently asked variants, rephrasings, and follow-ups. If you've seen these before, you’ll have a significant edge over your competitors. Remember, time pressure — especially at Meta — is intense, so speed is essential. Even with thorough preparation, interviewers may be unpredictable, but knowing the variants beforehand can drastically increase your chances of success.

Take LeetCode 560, Subarray Sum Equals K, which is one of Meta’s most frequently asked questions (top 20 as of writing). Meta sometimes sticks to the original problem. Variants - however - do exist, and with thousands of interviewers, it's hard to predict them all. We cover 2 key variants: one, what if you had to return true if there is at least one subarray sum that equals K? And two, what if you were given only positive numbers - does your algorithm change?

We also walk through variants in mock interviews. Using the exact platform (CoderPad) that Meta uses, you’ll get familiar with the UI, settings, and overall experience. This is a 1-on-1 simulation of how Meta conducts and facilitates their interviews, so the goal is to avoid wasting time on the tool itself. Once again, time limits at Meta are a huge factor, so speed is critical.

That said, even with perfect preparation, interviewers might not always be in a good mood or may judge unfairly. The interview process has its power dynamics, but with insider knowledge, you’ll have done as much as you can on your end to secure a Strong Hire decisi