Problem database last updated: June 20, 2025
3 problems · 2 Easy, 1 Medium, 0 Hard · Ranked #329 of 458
2 Easy
67% · avg 23%
1 Medium
33% · avg 59%
0 Hard
0% · avg 18%
Based on 3 reported problems, Optiver interviews are easier than average - only 0% Hard compared to 18% across all companies.
The most common topics are math (33.3%), string (33.3%), array (33.3%), dynamic-programming (33.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Number of Days Between Two Dates Write a program to count the number of days between two dates. | Easy | Very Likely | mathstring | Solve |
Best Time to Buy and Sell Stock You are given an array prices where prices[i] is the price of a given stock on the ith day. | Easy | Very Likely | arraydynamic-programming | 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 |
Number of Days Between Two Dates
SolveWrite a program to count the number of days between two dates.
Best Time to Buy and Sell Stock
SolveYou are given an array prices where prices[i] is the price of a given stock on the ith day.
LRU Cache
SolveDesign a data structure that follows the constraints of a Least Recently Used (LRU) cache.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Optiver interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Optiver interviews focus heavily on math, string, array 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. Optiver 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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Optiver has been reported to ask 3 distinct coding problems. The most common topics are math, string, array. 2 are Easy difficulty, 1 are Medium, and 0 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 3 reported problems, Optiver interviews are easier than average - only 0% Hard compared to 18% across all companies. 33% 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: math, string, array. 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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