Problem database last updated: June 20, 2025
12 problems · 0 Easy, 8 Medium, 4 Hard · Ranked #128 of 458
0 Easy
0% · avg 23%
8 Medium
67% · avg 59%
4 Hard
33% · avg 18%
Based on 12 reported problems, thoughtspot interviews are significantly harder than average - 33% Hard vs 18% across all companies. The majority (67%) of questions are Medium difficulty, which is typical for companies that want to see solid fundamentals without excessive trick questions.
Compared to the industry average, thoughtspot puts unusual emphasis on prefix-sum (25% of problems, 7.5x the industry average), union-find (16.7% of problems, 5.6x the industry average), bit-manipulation (16.7% of problems, 5x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (58.3%), hash-table (50%), prefix-sum (25%), dynamic-programming (25%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Count Subarrays With Median K You are given an array nums of size n consisting of distinct integers from 1 to n and a positive integer k. | Hard | Very Likely | arrayhash-tableprefix-sum | Solve |
Count Paths That Can Form a Palindrome in a Tree You are given a tree (i.e. a connected, undirected graph that has no cycles) rooted at node 0 consisting of n nodes numbered from 0 to n - 1. The tree is repres... | Hard | Very Likely | hash-tabledynamic-programmingbit-manipulation | Solve |
LRU Cache Design a data structure that follows the constraints of a Least Recently Used (LRU) cache. | Medium | Very Likely | hash-tablelinked-listdesign | Solve |
Minimum Window Substring Given two strings s and t of lengths m and n respectively, return the minimum window substring of s such that every character in t (including duplicates) is inc... | Hard | Very Likely | hash-tablestringsliding-window | Solve |
House Robber II You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed. All houses at this place are arranged in... | Medium | Likely | arraydynamic-programming | Solve |
Subarray Sums Divisible by K Given an integer array nums and an integer k, return the number of non-empty subarrays that have a sum divisible by k. | Medium | Likely | arrayhash-tableprefix-sum | Solve |
Most Stones Removed with Same Row or Column On a 2D plane, we place n stones at some integer coordinate points. Each coordinate point may have at most one stone. | Medium | Likely | hash-tabledepth-first-searchunion-find | Solve |
Count Pairs of Connectable Servers in a Weighted Tree Network You are given an unrooted weighted tree with n vertices representing servers numbered from 0 to n - 1, an array edges where edges[i] = [ai, bi, weighti] represe... | Medium | Likely | arraytreedepth-first-search | Solve |
Minimum Number of K Consecutive Bit Flips You are given a binary array nums and an integer k. | Hard | Likely | arraybit-manipulationqueue | Solve |
Number of Islands Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands. | Medium | Likely | arraydepth-first-searchbreadth-first-search | Solve |
Interleaving String Given strings s1, s2, and s3, find whether s3 is formed by an interleaving of s1 and s2. | Medium | Likely | stringdynamic-programming | Solve |
Snakes and Ladders You are given an n x n integer matrix board where the cells are labeled from 1 to n2 in a Boustrophedon style starting from the bottom left of the board (i.e. b... | Medium | Likely | arraybreadth-first-searchmatrix | Solve |
Count Subarrays With Median K
SolveYou are given an array nums of size n consisting of distinct integers from 1 to n and a positive integer k.
Count Paths That Can Form a Palindrome in a Tree
SolveYou are given a tree (i.e. a connected, undirected graph that has no cycles) rooted at node 0 consisting of n nodes numbered from 0 to n - 1. The tree is repres...
LRU Cache
SolveDesign a data structure that follows the constraints of a Least Recently Used (LRU) cache.
Minimum Window Substring
SolveGiven two strings s and t of lengths m and n respectively, return the minimum window substring of s such that every character in t (including duplicates) is inc...
House Robber II
SolveYou are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed. All houses at this place are arranged in...
Subarray Sums Divisible by K
SolveGiven an integer array nums and an integer k, return the number of non-empty subarrays that have a sum divisible by k.
Most Stones Removed with Same Row or Column
SolveOn a 2D plane, we place n stones at some integer coordinate points. Each coordinate point may have at most one stone.
Count Pairs of Connectable Servers in a Weighted Tree Network
SolveYou are given an unrooted weighted tree with n vertices representing servers numbered from 0 to n - 1, an array edges where edges[i] = [ai, bi, weighti] represe...
Minimum Number of K Consecutive Bit Flips
SolveYou are given a binary array nums and an integer k.
Number of Islands
SolveGiven an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands.
Interleaving String
SolveGiven strings s1, s2, and s3, find whether s3 is formed by an interleaving of s1 and s2.
Snakes and Ladders
SolveYou are given an n x n integer matrix board where the cells are labeled from 1 to n2 in a Boustrophedon style starting from the bottom left of the board (i.e. b...
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent thoughtspot interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
thoughtspot interviews focus heavily on array, hash-table, prefix-sum problems. If you're short on time, these are the categories to prioritize. The problems on this page are sorted by frequency, so start from the top and work your way down.
Beyond solving problems, practice explaining your approach. thoughtspot interviewers care about your thought process - how you break down a problem, consider edge cases, and evaluate tradeoffs between solutions. A clean O(n) solution you can explain clearly beats an O(log n) solution you can't articulate.
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thoughtspot has been reported to ask 12 distinct coding problems. The most common topics are array, hash-table, prefix-sum. 0 are Easy difficulty, 8 are Medium, and 4 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 12 reported problems, thoughtspot interviews are significantly harder than average - 33% Hard vs 18% across all companies. 67% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
Start with the highest-frequency problems listed on this page. Focus on the core topics: array, hash-table, prefix-sum. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
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