Spiral Matrix
A medium-tier problem at 54% community acceptance, tagged with Array, Matrix, Simulation. Reported in interviews at AMD and 45 others.
Spiral Matrix shows up at AMD, Capital One, Cisco, and 43 other companies. You're given an m x n matrix and need to return all elements in spiral order: right, down, left, up, repeat inward. It sounds simple until you're live, your boundaries collapse, and you've retraced a row. The trick is tracking four limits (top, bottom, left, right) and shrinking them after each direction. If you blank on the boundary logic during the assessment, StealthCoder surfaces a clean solution in seconds, invisible to the proctor.
Companies that ask "Spiral Matrix"
Spiral Matrix 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 a senior engineer who knows the OA is theater. This is the script.
Get StealthCoderThe naive approach fails because most candidates either revisit cells or skip them by miscounting boundaries. The real pattern: after moving right, increment top. After down, decrement right. After left, decrement bottom. After up, increment left. Check that boundaries still exist between each step. The loop condition needs to guard against a fully exhausted matrix. This is a Simulation problem dressed as an Array problem, and the acceptance rate of 54 percent reflects the number of candidates who get the boundary logic wrong on first attempt. On a live OA, off-by-one errors here cost minutes. StealthCoder hedges that risk by delivering a working spiral traversal instantly if you hit the wall.
Pattern tags
You know the problem.
Make sure you actually pass it.
Spiral Matrix recycles across companies for a reason. It's medium-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 a senior engineer who knows the OA is theater. This is the script. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Spiral Matrix interview FAQ
How hard is Spiral Matrix really?+
Medium difficulty is accurate. The algorithm is straightforward once you see the boundary-shrinking pattern. The real challenge is clean implementation under time pressure. Most failures come from boundary logic errors, not algorithmic insight. With solid prep, it's a confident pass.
Do top companies still ask Spiral Matrix?+
Yes. It appears across 46 reported companies including AMD, Capital One, Cisco, and Epic Systems. It's especially common at finance and infrastructure firms. The wide ask rate suggests it's a reliable screening filter for attention to detail.
What's the actual trick to Spiral Matrix?+
Maintain four boundary pointers and shrink them after each directional pass. The order matters: top after right, right after down, bottom after left, left after up. Check that boundaries haven't crossed before each direction. Boundary collision is where most candidates stumble.
Is Spiral Matrix just about memorizing the pattern?+
No. You need to understand why boundaries shrink and when to check for exhaustion. Memorization without logic fails on rectangular matrices or under pressure. The conceptual grip comes from simulating the spiral step by step, not from rote code.
How does Spiral Matrix connect to other matrix problems?+
It's a pure Simulation problem that tests boundary management and directional traversal. Those skills transfer to problems like Rotate Matrix and Set Matrix Zeroes. It also bridges Array and Matrix topics. Master the boundary logic here and you're faster on related OAs.
Want the actual problem statement? View "Spiral Matrix" on LeetCode →