Enumeration interview questions
46 enumeration problems tagged across recent interview reports. Drilled most heavily by rubrik, capital one, and visa.
Enumeration is the systematic generation and checking of all candidate solutions within a search space. You're iterating through possibilities, testing each against constraints, and collecting valid answers. With 46 problems in this pattern, it's a foundational skill that shows up most heavily at Rubrik, Capital One, and Visa. It's not glamorous, but it's often the first working solution before optimization. If you can't recognize when to enumerate and when to stop, you'll either time out or miss easy points in a live OA. StealthCoder is the safety net when a variant lands that you didn't drill.
Most-asked enumeration problems
You can't drill every enumeration variant before the assessment. StealthCoder runs invisibly during screen share and solves whichever variant they throw at you. No browser extension. No detection signature. Built by an engineer at a top-10 tech company who can solve these problems cold but didn't want to trust himself in a 90-minute screen share.
Get StealthCoderEnumeration problems ask you to find, count, or generate all solutions matching specific criteria. The pattern is recognizable by phrases like 'find all', 'count valid', or 'list combinations where'. Common subtypes: nested loops over indices (pairs, triplets, quadruplets), Cartesian products, constraint-based filtering, and subset generation. Drill order matters: start with straightforward nested loops like counting triplets or quadruplets, move to problems with geometric or mathematical constraints (lattice points, prime counts), then tackle optimization tricks like early termination or pruning. Problems like count-good-triplets and count-increasing-quadruplets build the foundation. When a harder variant hits your screen in a live assessment, StealthCoder reads the problem and delivers a solution in seconds, invisible to the proctor.
Companies that hire most on enumeration
46 enumeration problems.
You won't drill them all. Pass anyway.
Enumeration is one of the patterns interviews actually filter on. Memorizing every variant in a week is a fantasy. StealthCoder is the hedge: an AI overlay invisible during screen share. It reads the problem and surfaces a working solution in under 2 seconds, no matter which enumeration flavor lands in your live OA. Built by an engineer at a top-10 tech company who can solve these problems cold but didn't want to trust himself in a 90-minute screen share. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Enumeration interview FAQ
How many enumeration problems should I drill before an OA?+
At least 8 to 10 across varying difficulty. Start with triplet/quadruplet patterns, then add constraint-based ones like coordinate-with-maximum-network-quality. The 46 problems in this pattern span wide ground; focus on the subtypes that match your target companies' recent problems.
Is enumeration just brute force?+
Not quite. Enumeration is the controlled generation of candidates. Brute force is one flavor. Real enumeration often includes pruning, early termination, or mathematical shortcuts to avoid exploring the entire space. Problems like consecutive-numbers-sum show how to enumerate smartly.
Which companies ask enumeration the most?+
Rubrik leads with 6 problems, followed by Capital One and Visa at 5 each. De Shaw, Atlassian, Databricks, and Sprinklr each have 4. If you're interviewing there, enumeration is not optional.
How do I recognize an enumeration problem in 10 seconds?+
Look for 'find all', 'count valid', 'list all pairs/triplets', or 'generate all subsets'. If the problem is asking you to iterate through a solution space and test conditions, you're enumerating. Problems like count-almost-equal-pairs-i and collect-chocolates fit this pattern.
Should I optimize enumeration or just write the nested loops?+
Write the nested loops first to pass examples. Then optimize only if time limit fails. Many enumeration problems are solvable within limits with clean O(n^2) or O(n^3) code. Premature optimization wastes interview time.