thoughtspot coding interview
questions, leaked.
12 problems reported across recent thoughtspot interviews. Top patterns: array, hash table, depth first search. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
ThoughtSpot's assessment leans hard on arrays and hash tables, with half the problems rated hard. You're looking at 12 questions total, but the distribution is brutal: zero easy problems, eight medium, four hard. The hard ones stack multiple patterns, like combining arrays with prefix sums or bit manipulation with sliding windows. This isn't a warm-up round. If you hit a wall on Minimum Window Substring or Count Subarrays With Median K, StealthCoder runs invisibly during your assessment and surfaces a working solution in seconds, buying you time to move on and score elsewhere.
Top problems at thoughtspot
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Count Subarrays With Median K | HARD | 100.0 | 46% | Array · Hash Table · Prefix Sum |
| 02 | Count Paths That Can Form a Palindrome in a Tree | HARD | 89.5 | 45% | Dynamic Programming · Bit Manipulation · Tree |
| 03 | LRU Cache | MEDIUM | 82.1 | 45% | Hash Table · Linked List · Design |
| 04 | Minimum Window Substring | HARD | 82.1 | 45% | Hash Table · String · Sliding Window |
| 05 | Snakes and Ladders | MEDIUM | 71.6 | 48% | Array · Breadth-First Search · Matrix |
| 06 | Number of Islands | MEDIUM | 71.6 | 62% | Array · Depth-First Search · Breadth-First Search |
| 07 | Subarray Sums Divisible by K | MEDIUM | 71.6 | 56% | Array · Hash Table · Prefix Sum |
| 08 | Most Stones Removed with Same Row or Column | MEDIUM | 71.6 | 62% | Hash Table · Depth-First Search · Union Find |
| 09 | Minimum Number of K Consecutive Bit Flips | HARD | 71.6 | 62% | Array · Bit Manipulation · Queue |
| 10 | Interleaving String | MEDIUM | 71.6 | 42% | String · Dynamic Programming |
| 11 | Count Pairs of Connectable Servers in a Weighted Tree Network | MEDIUM | 71.6 | 54% | Array · Tree · Depth-First Search |
| 12 | House Robber II | MEDIUM | 71.6 | 44% | Array · Dynamic Programming |
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 thoughtspot OA. The proctor cannot see it. Screen share cannot detect it. Made for the engineer who has done the work but might still blank with a webcam pointed at him.
Get StealthCoder- array7 · 58%
- hash table5 · 42%
- depth first search4 · 33%
- prefix sum3 · 25%
- dynamic programming3 · 25%
- bit manipulation2 · 17%
- tree2 · 17%
- breadth first search2 · 17%
- matrix2 · 17%
- union find2 · 17%
Arrays dominate the test with seven problems, but you can't just grind array drills and call it done. Hash tables appear in five problems, often paired with arrays or strings. The real trap is the hard problems: they combine two or three patterns at once. Prefix sums show up in three mediums and one hard, so if you blank on that technique mid-assessment, it costs you. Depth-first search and dynamic programming each appear in three problems, making them second-priority drills. The medium problems are your bread and butter for score padding, but the hard ones require clean implementations. Since StealthCoder is your real-time safety net if you blank on a prefix-sum or DFS pattern during the live OA, focus your prep on the mediums first, get them airtight, then study hard-problem patterns in combination.
Companies with similar patterns
If you prepped for thoughtspot, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass thoughtspot.
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. Made for the engineer who has done the work but might still blank with a webcam pointed at him. Works on HackerRank, CodeSignal, CoderPad, and Karat.
thoughtspot interview FAQ
Should I study hash tables before arrays for ThoughtSpot?+
No. Arrays appear in seven problems versus five for hash tables. But don't ignore hash tables, they're paired with arrays in at least three of those. Study arrays first, then hash tables in the context of array problems. The mediums like Subarray Sums Divisible by K drill both.
How many hard problems should I solve before the assessment?+
ThoughtSpot has four hard problems out of twelve, all combining multiple topics. Study at least two fully, especially ones mixing prefix sums with arrays or DFS with bit manipulation. If you can nail Minimum Window Substring and one other hard, you're positioned to score even if you blank on a third.
Is dynamic programming essential for ThoughtSpot?+
It appears in three problems, including one hard. It's not the focus like arrays are, but you'll see it paired with strings or trees. If you have time, drill Interleaving String and House Robber II as warm-ups. Don't prioritize it over array patterns.
What's the fastest way to prep for arrays and prefix sums together?+
Two problems hit both: Subarray Sums Divisible by K and Count Subarrays With Median K. Start with Subarray Sums since it's medium difficulty. Once you've solved it and understand the prefix-sum hash table trick, you'll spot the pattern in harder variants.
How much time should I spend on DFS versus BFS?+
DFS appears in four problems, BFS in two. Prioritize DFS, but both show up in Number of Islands and Most Stones Removed. Solve Number of Islands twice, once with DFS and once with union-find, so you can pick the faster approach during your actual assessment.