Problem database last updated: June 20, 2025
2 problems · 0 Easy, 1 Medium, 1 Hard · Ranked #419 of 458
0 Easy
0% · avg 23%
1 Medium
50% · avg 59%
1 Hard
50% · avg 18%
Based on 2 reported problems, instabase interviews are significantly harder than average - 50% Hard vs 18% across all companies.
The most common topics are hash-table (50%), string (50%), design (50%), trie (50%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Implement Trie (Prefix Tree) A trie (pronounced as "try") or prefix tree is a tree data structure used to efficiently store and retrieve keys in a dataset of strings. There are various appl... | Medium | Very Likely | hash-tablestringdesign | Solve |
Subarray With Elements Greater Than Varying Threshold You are given an integer array nums and an integer threshold. | Hard | Very Likely | arraystackunion-find | Solve |
Implement Trie (Prefix Tree)
SolveA trie (pronounced as "try") or prefix tree is a tree data structure used to efficiently store and retrieve keys in a dataset of strings. There are various appl...
Subarray With Elements Greater Than Varying Threshold
SolveYou are given an integer array nums and an integer threshold.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent instabase interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
instabase interviews focus heavily on hash-table, string, design 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. instabase 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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instabase has been reported to ask 2 distinct coding problems. The most common topics are hash-table, string, design. 0 are Easy difficulty, 1 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 2 reported problems, instabase interviews are significantly harder than average - 50% Hard vs 18% across all companies. 50% 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: hash-table, string, design. 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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