UKG coding interview
questions, leaked.
11 problems reported across recent UKG interviews. Top patterns: array, string, hash table. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
UKG's coding assessment leans hard on arrays and strings, with 11 problems split across easy, medium, and hard. You'll see hash-table and math patterns repeatedly. Most of what they test is medium difficulty, but the two hard problems require you to combine geometry, sorting, and tree structures under pressure. If you hit a wall on something like Maximum Area Rectangle With Point Constraints II mid-assessment, StealthCoder runs invisibly and surfaces a working solution in seconds, no proctor visibility.
Top problems at UKG
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Maximum Area Rectangle With Point Constraints II | HARD | 100.0 | 21% | Array · Math · Binary Indexed Tree |
| 02 | Maximum Area Rectangle With Point Constraints I | MEDIUM | 100.0 | 50% | Array · Math · Binary Indexed Tree |
| 03 | Special Binary String | HARD | 84.2 | 64% | String · Recursion |
| 04 | Minimum Length of Anagram Concatenation | MEDIUM | 79.1 | 40% | Hash Table · String · Counting |
| 05 | Count the Number of Good Subsequences | MEDIUM | 79.1 | 51% | Hash Table · Math · String |
| 06 | Valid Word | EASY | 72.5 | 39% | String |
| 07 | Longest Consecutive Sequence | MEDIUM | 72.5 | 47% | Array · Hash Table · Union Find |
| 08 | Two Sum | EASY | 72.5 | 56% | Array · Hash Table |
| 09 | Make a Positive Array | MEDIUM | 63.3 | 38% | Array · Greedy · Prefix Sum |
| 10 | Best Time to Buy and Sell Stock | EASY | 63.3 | 55% | Array · Dynamic Programming |
| 11 | Angle Between Hands of a Clock | MEDIUM | 63.3 | 64% | 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 UKG OA. The proctor cannot see it. Screen share cannot detect it. 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 StealthCoder- array6 · 55%
- string4 · 36%
- hash table4 · 36%
- math4 · 36%
- counting2 · 18%
- binary indexed tree2 · 18%
- segment tree2 · 18%
- geometry2 · 18%
- sorting2 · 18%
- recursion1 · 9%
Arrays dominate the question set, appearing in six problems. Strings and hash-tables each show up four times, so you need solid fundamentals on substring matching, character counts, and hash-based lookups. Math and counting appear frequently enough that you can't skip them. The real trap: two hard problems stitch together multiple topics. Maximum Area Rectangle With Point Constraints I and II mix arrays, math, geometry, and advanced tree structures. Those aren't flukes; they're signals that UKG expects you to see how patterns connect. Start with the basics (Two Sum, Best Time to Buy and Sell Stock), then spend real time on hash-table plus string combinations like Minimum Length of Anagram Concatenation and Count the Number of Good Subsequences. StealthCoder hedges the gaps. If you haven't drilled segment trees or binary indexed trees, that's your blind spot.
Companies with similar patterns
If you prepped for UKG, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass UKG.
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 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.
UKG interview FAQ
Should I memorize segment trees for UKG?+
Two of 11 problems use segment trees or binary indexed trees, so they're not ignorable. But they're bundled with geometry and sorting in hard problems. Get comfortable with hash-tables and arrays first (they span six and four problems respectively), then tackle tree structures if you have time. Know the pattern, not necessarily the implementation.
How many string problems should I solve before the OA?+
Strings appear in four problems here. Three are medium or hard and often combine with hash-tables or recursion (Special Binary String, Minimum Length of Anagram Concatenation). Drill at least two pure string problems, then do two mixed string-plus-hash problems. That covers your exposure.
Is two-sum enough for array fundamentals?+
No. Two Sum is easy, and arrays appear in six problems total. You need Two Sum, Best Time to Buy and Sell Stock, Longest Consecutive Sequence, and the Make a Positive Array greedy problem. Four problems give you enough depth for arrays at UKG's difficulty mix.
What's the weakest topic I can skip?+
Recursion, union-find, and dynamic programming each touch only one or two problems. They're lower priority. If you're short on time, skip deep recursion drills and focus on arrays, hash-tables, and strings first. You can't afford to skip math or geometry.
Should I practice the hard problems before the assessment?+
Yes, at least once. Maximum Area Rectangle With Point Constraints I and II are technical and combine many topics. You won't solve them cold. Work through one, understand the geometry and sorting logic, then trust that the medium problems will feel manageable by comparison.