Groupon coding interview
questions, leaked.
4 problems reported across recent Groupon interviews. Top patterns: array, math, greedy. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Groupon's interview is all medium difficulty, no easy problems to warm up on. You're facing four problems across arrays, math, and greedy algorithms. Every single one tests your ability to optimize under pressure. This isn't about knowing patterns, it's about adapting fast. The good news: the problem set is tight and predictable. The better news: if you hit a wall mid-assessment and can't remember the greedy trick or the binary-search angle, StealthCoder runs invisible during your screen share and surfaces a working solution in seconds.
Top problems at Groupon
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Sell Diminishing-Valued Colored Balls | MEDIUM | 100.0 | 30% | Array · Math · Binary Search |
| 02 | Jump Game II | MEDIUM | 74.9 | 42% | Array · Dynamic Programming · Greedy |
| 03 | Find the Winner of the Circular Game | MEDIUM | 66.5 | 82% | Array · Math · Recursion |
| 04 | Insert Delete GetRandom O(1) | MEDIUM | 66.5 | 55% | Array · Hash Table · Math |
Frequencies derived from public community-tagged interview reports. Click a row to view on LeetCode.
You have a week, maybe less. You can't out-grind the list above. StealthCoder runs invisibly during the actual Groupon OA. The proctor cannot see it. Screen share cannot detect it. Built because the OA filter rejects engineers who'd pass the on-site. That's a broken filter. This is the workaround.
Get StealthCoder- array4 · 100%
- math3 · 75%
- greedy2 · 50%
- recursion1 · 25%
- queue1 · 25%
- simulation1 · 25%
- hash table1 · 25%
- design1 · 25%
- randomized1 · 25%
- binary search1 · 25%
Arrays dominate the Groupon interview. Three of the four problems are array-heavy, and most require you to think in terms of optimization (greedy, binary search, or dynamic programming). Math appears in half the problems, often layered with arrays. Recursion, queue, and simulation show up once each, which means you can't ignore them but they're not the focus. The real trap: these problems look deceptively simple. Jump Game II seems straightforward until you realize a naive approach times out. Sell Diminishing-Valued Colored Balls pairs arrays with binary search and greedy logic. You need to drill greedy intuition and binary-search setup first, then lean on array manipulation. If you blank on the binary-search bounds or the greedy logic mid-OA, StealthCoder is your safety net. Study the problems above in this order: greedy (highest leverage), math patterns, then hash-table and design edge cases.
Companies with similar patterns
If you prepped for Groupon, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Groupon.
Memorizing every problem above in a week is a fantasy. StealthCoder is the hedge: an AI overlay that's invisible during screen share. It reads the problem on screen and surfaces a working solution in under 2 seconds. Built because the OA filter rejects engineers who'd pass the on-site. That's a broken filter. This is the workaround. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Groupon interview FAQ
How many array problems should I solve before the Groupon OA?+
All four Groupon problems use arrays, but quantity isn't the issue. Study the four listed problems deeply, then solve 5-10 additional medium-difficulty array + greedy combos. Groupon prioritizes optimization over data-structure variety, so focus on greedy and binary-search patterns within arrays.
Is greedy enough for Groupon, or do I need to learn binary search too?+
Both. The top problem, Sell Diminishing-Valued Colored Balls, explicitly combines greedy with binary search and sorting. Greedy alone won't pass that one. Study greedy decision-making first (Jump Game II), then drill binary search on the harder problem.
Should I worry about hash tables and design problems for Groupon?+
Yes, but lower priority. Insert Delete GetRandom O(1) is a design problem that uses hash tables. It tests your ability to support random access and deletion in constant time. Solve it, understand the trick, but it's one of four, so don't spend a week on it.
What if I don't know the math trick during the actual assessment?+
That's where preparation and a backup plan matter. Drill the four listed problems until the math patterns feel automatic. If you still blank on the circular game or diminishing-value math mid-OA, StealthCoder reads the problem and hands you a working approach invisible to the proctor.
How much time should I spend on recursion and queue for Groupon?+
The circular game problem uses recursion, queue, and simulation, but it's one of four total. Master the array and greedy problems first. If you have time, solve the circular game to understand the Josephus problem variant, but don't let recursion distract you from optimizing arrays.