Problem database last updated: June 20, 2025
3 problems · 1 Easy, 1 Medium, 1 Hard · Ranked #341 of 458
1 Easy
33% · avg 23%
1 Medium
33% · avg 59%
1 Hard
33% · avg 18%
Based on 3 reported problems, Riot Games interviews are significantly harder than average - 33% Hard vs 18% across all companies.
Compared to the industry average, Riot Games puts unusual emphasis on matrix (66.7% of problems, 7.5x the industry average), hash-table (66.7% of problems, 3x the industry average), array (100% of problems, 1.7x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (100%), hash-table (66.7%), matrix (66.7%), simulation (33.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Teemo Attacking Our hero Teemo is attacking an enemy Ashe with poison attacks! When Teemo attacks Ashe, Ashe gets poisoned for a exactly duration seconds. More formally, an att... | Easy | Very Likely | arraysimulation | Solve |
Valid Sudoku Determine if a 9 x 9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules: | Medium | Very Likely | arrayhash-tablematrix | Solve |
Sudoku Solver Write a program to solve a Sudoku puzzle by filling the empty cells. | Hard | Very Likely | arrayhash-tablebacktracking | Solve |
Teemo Attacking
SolveOur hero Teemo is attacking an enemy Ashe with poison attacks! When Teemo attacks Ashe, Ashe gets poisoned for a exactly duration seconds. More formally, an att...
Valid Sudoku
SolveDetermine if a 9 x 9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules:
Sudoku Solver
SolveWrite a program to solve a Sudoku puzzle by filling the empty cells.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Riot Games interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Riot Games interviews focus heavily on array, hash-table, matrix 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. Riot Games 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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Riot Games has been reported to ask 3 distinct coding problems. The most common topics are array, hash-table, matrix. 1 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 3 reported problems, Riot Games interviews are significantly harder than average - 33% Hard vs 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: array, hash-table, matrix. 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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