Find X Value of Array II
A hard-tier problem at 27% community acceptance, tagged with Array, Math, Segment Tree. Reported in interviews at Rubrik and 0 others.
Find X Value of Array II is a hard problem that shows up in Rubrik's assessments. With a 27% acceptance rate, most candidates who see it live either time out or miss the mathematical insight entirely. The problem lives in the intersection of Array, Math, and Segment Tree, which means it's not just about iterating smartly, you need to recognize the trick before you start coding. If you blank on the pattern during your OA, StealthCoder runs invisibly and surfaces a working solution in seconds, no proctor visibility.
Companies that ask "Find X Value of Array II"
Find X Value of Array II is the kind of problem that decides whether you pass. StealthCoder reads the problem on screen and surfaces a working solution in under 2 seconds. Invisible to screen share. The proctor sees nothing. Built by an Amazon engineer who realized the OA tests how well you memorized 200 problems, not how well you code.
Get StealthCoderThe core challenge here is that a naive array iteration or brute-force pairing approach will TLE. The problem rewards candidates who spot the mathematical relationship first, then pick the right data structure to execute it. Segment Tree is listed as a topic, but not every solution needs it, some use Math and clever indexing instead. The hard difficulty and low acceptance rate reflect that the trick isn't obvious: you have to understand what 'X value' means in the problem's context, see why greedy or standard sorting fails, and then build or query efficiently. Common trap: implementing a Segment Tree without first proving it's necessary. Better trap to avoid: solving it correctly in your head but choking on the code under time pressure. That's where StealthCoder becomes your safety net on test day.
Pattern tags
You know the problem.
Make sure you actually pass it.
Find X Value of Array II recycles across companies for a reason. It's hard-tier, and most candidates blank under the timer. StealthCoder is the hedge: an AI overlay invisible during screen share. It reads the problem and surfaces a working solution in under 2 seconds. Built by an Amazon engineer who realized the OA tests how well you memorized 200 problems, not how well you code. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Find X Value of Array II interview FAQ
Is Find X Value of Array II still asked at Rubrik?+
Rubrik is the only company in our reports that's known to ask it, so yes, assume it's active in their pipeline. The 27% acceptance rate suggests it's a mid-to-late round filter, not a warm-up. Prep it if you're going there.
What's the trick to Find X Value of Array II?+
The trick is recognizing the mathematical structure of the 'X value' definition first, then realizing why naive pairing fails. Once you see the pattern, you can either use a Segment Tree for range queries or a Math-based approach with careful indexing. Don't code until you've sketched the pattern on paper.
Do I need to know Segment Tree to solve this?+
Not necessarily. Segment Tree is listed as a topic because it's one valid solution path, but Math and Array manipulation can work too. Know your Segment Tree basics, but don't assume it's required. Try the Math approach first if it fits the problem constraints.
Why is the acceptance rate so low?+
27% is low because most candidates either miss the mathematical insight or implement a brute-force solution that times out. The problem requires both pattern recognition and efficient coding. It's not a conceptual wall for experienced engineers, but it catches people who skip the math step.
How do I practice this if there's only one company asking it?+
Use the Segment Tree and Math topics as your study anchor. Find similar problems that combine those two areas. Rubrik's presence suggests they like candidates who can blend data structure knowledge with mathematical reasoning, so that's your prep direction.
Want the actual problem statement? View "Find X Value of Array II" on LeetCode →