Problem database last updated: June 20, 2025
3 problems · 1 Easy, 0 Medium, 2 Hard · Ranked #353 of 458
1 Easy
33% · avg 23%
0 Medium
0% · avg 59%
2 Hard
67% · avg 18%
Based on 3 reported problems, HiLabs interviews are significantly harder than average - 67% Hard vs 18% across all companies.
Compared to the industry average, HiLabs puts unusual emphasis on string (66.7% of problems, 2.4x 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%), dynamic-programming (33.3%), bit-manipulation (33.3%), bitmask (33.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Maximize the Number of Partitions After Operations You are given a string s and an integer k. | Hard | Very Likely | stringdynamic-programmingbit-manipulation | Solve |
Water Bottles There are numBottles water bottles that are initially full of water. You can exchange numExchange empty water bottles from the market with one full water bottle... | Easy | Likely | mathsimulation | Solve |
Parsing A Boolean Expression A boolean expression is an expression that evaluates to either true or false. It can be in one of the following shapes: | Hard | Likely | stringstackrecursion | Solve |
Maximize the Number of Partitions After Operations
SolveYou are given a string s and an integer k.
Water Bottles
SolveThere are numBottles water bottles that are initially full of water. You can exchange numExchange empty water bottles from the market with one full water bottle...
Parsing A Boolean Expression
SolveA boolean expression is an expression that evaluates to either true or false. It can be in one of the following shapes:
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent HiLabs interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
HiLabs interviews focus heavily on string, dynamic-programming, bit-manipulation 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. HiLabs 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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HiLabs has been reported to ask 3 distinct coding problems. The most common topics are string, dynamic-programming, bit-manipulation. 1 are Easy difficulty, 0 are Medium, and 2 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 3 reported problems, HiLabs interviews are significantly harder than average - 67% Hard vs 18% across all companies. 0% 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, dynamic-programming, bit-manipulation. 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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