Problem database last updated: June 20, 2025
6 problems · 2 Easy, 4 Medium, 0 Hard · Ranked #218 of 458
2 Easy
33% · avg 23%
4 Medium
67% · avg 59%
0 Hard
0% · avg 18%
Based on 6 reported problems, Compass interviews are easier than average - only 0% Hard compared to 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, Compass puts unusual emphasis on string-matching (33.3% of problems, 38.2x the industry average), string (66.7% of problems, 2.4x the industry average), hash-table (33.3% of problems, 1.5x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are string (66.7%), array (33.3%), hash-table (33.3%), string-matching (33.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Total Distance Traveled A truck has two fuel tanks. You are given two integers, mainTank representing the fuel present in the main tank in liters and additionalTank representing the fu... | Easy | Very Likely | mathsimulation | Solve |
Group Anagrams Given an array of strings strs, group the anagrams together. You can return the answer in any order. | Medium | Very Likely | arrayhash-tablestring | Solve |
Decode String Given an encoded string, return its decoded string. | Medium | Very Likely | stringstackrecursion | Solve |
Time Based Key-Value Store Design a time-based key-value data structure that can store multiple values for the same key at different time stamps and retrieve the key's value at a certain... | Medium | Very Likely | hash-tablestringbinary-search | Solve |
Camelcase Matching Given an array of strings queries and a string pattern, return a boolean array answer where answer[i] is true if queries[i] matches pattern, and false otherwise... | Medium | Very Likely | arraytwo-pointersstring | Solve |
Subtree of Another Tree Given the roots of two binary trees root and subRoot, return true if there is a subtree of root with the same structure and node values of subRoot and false oth... | Easy | Very Likely | treedepth-first-searchstring-matching | Solve |
Total Distance Traveled
SolveA truck has two fuel tanks. You are given two integers, mainTank representing the fuel present in the main tank in liters and additionalTank representing the fu...
Group Anagrams
SolveGiven an array of strings strs, group the anagrams together. You can return the answer in any order.
Decode String
SolveGiven an encoded string, return its decoded string.
Time Based Key-Value Store
SolveDesign a time-based key-value data structure that can store multiple values for the same key at different time stamps and retrieve the key's value at a certain...
Camelcase Matching
SolveGiven an array of strings queries and a string pattern, return a boolean array answer where answer[i] is true if queries[i] matches pattern, and false otherwise...
Subtree of Another Tree
SolveGiven the roots of two binary trees root and subRoot, return true if there is a subtree of root with the same structure and node values of subRoot and false oth...
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Compass interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Compass interviews focus heavily on string, array, hash-table 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. Compass 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.
Looking for more companies? Browse all 458 companies in our directory, or sharpen your fundamentals with our free data structure visualizers and AI-powered DSA tutor.
Compass has been reported to ask 6 distinct coding problems. The most common topics are string, array, hash-table. 2 are Easy difficulty, 4 are Medium, and 0 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 6 reported problems, Compass interviews are easier than average - only 0% Hard compared to 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: string, array, hash-table. 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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