Problem database last updated: June 20, 2025
4 problems · 0 Easy, 3 Medium, 1 Hard · Ranked #299 of 458
0 Easy
0% · avg 23%
3 Medium
75% · avg 59%
1 Hard
25% · avg 18%
Based on 4 reported problems, Reddit interviews are slightly harder than average - 25% Hard vs 18% across all companies. The majority (75%) of questions are Medium difficulty, which is typical for companies that want to see solid fundamentals without excessive trick questions.
Compared to the industry average, Reddit puts unusual emphasis on breadth-first-search (50% of problems, 6x the industry average), hash-table (50% of problems, 2.2x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are hash-table (50%), breadth-first-search (50%), string (25%), math (25%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Word Ladder A transformation sequence from word beginWord to word endWord using a dictionary wordList is a sequence of words beginWord -> s1 -> s2 -> ... -> sk such that: | Hard | Very Likely | hash-tablestringbreadth-first-search | Solve |
Number of Ways to Buy Pens and Pencils You are given an integer total indicating the amount of money you have. You are also given two integers cost1 and cost2 indicating the price of a pen and pencil... | Medium | Very Likely | mathenumeration | 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 Islands Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands. | Medium | Likely | arraydepth-first-searchbreadth-first-search | Solve |
Word Ladder
SolveA transformation sequence from word beginWord to word endWord using a dictionary wordList is a sequence of words beginWord -> s1 -> s2 -> ... -> sk such that:
Number of Ways to Buy Pens and Pencils
SolveYou are given an integer total indicating the amount of money you have. You are also given two integers cost1 and cost2 indicating the price of a pen and pencil...
LRU Cache
SolveDesign a data structure that follows the constraints of a Least Recently Used (LRU) cache.
Number of Islands
SolveGiven an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Reddit interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Reddit interviews focus heavily on hash-table, breadth-first-search, 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. Reddit 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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Reddit has been reported to ask 4 distinct coding problems. The most common topics are hash-table, breadth-first-search, string. 0 are Easy difficulty, 3 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 4 reported problems, Reddit interviews are slightly harder than average - 25% Hard vs 18% across all companies. 75% 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, breadth-first-search, 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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