Problem database last updated: June 20, 2025
2 problems · 1 Easy, 1 Medium, 0 Hard · Ranked #385 of 458
1 Easy
50% · avg 23%
1 Medium
50% · avg 59%
0 Hard
0% · avg 18%
Based on 2 reported problems, Blizzard interviews are easier than average - only 0% Hard compared to 18% across all companies.
Compared to the industry average, Blizzard puts unusual emphasis on dynamic-programming (100% of problems, 5.1x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are dynamic-programming (100%), array (50%), string (50%), stack (50%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
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 |
Valid Parenthesis String Given a string s containing only three types of characters: '(', ')' and '', return true if s is valid. | Medium | Very Likely | stringdynamic-programmingstack | Solve |
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.
Valid Parenthesis String
SolveGiven a string s containing only three types of characters: '(', ')' and '', return true if s is valid.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Blizzard interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Blizzard interviews focus heavily on dynamic-programming, array, string 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. Blizzard 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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Blizzard has been reported to ask 2 distinct coding problems. The most common topics are dynamic-programming, array, string. 1 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 2 reported problems, Blizzard interviews are easier than average - only 0% Hard compared to 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: dynamic-programming, array, string. 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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