Problem database last updated: June 20, 2025
14 problems · 3 Easy, 10 Medium, 1 Hard · Ranked #118 of 458
3 Easy
21% · avg 23%
10 Medium
71% · avg 59%
1 Hard
7% · avg 18%
Based on 14 reported problems, Robinhood interviews are easier than average - only 7% Hard compared to 18% across all companies. The majority (71%) 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, Robinhood puts unusual emphasis on bucket-sort (14.3% of problems, 18.4x the industry average), counting (21.4% of problems, 6.4x the industry average), heap-priority-queue (21.4% of problems, 3.5x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (85.7%), hash-table (42.9%), depth-first-search (28.6%), string (28.6%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Number of Orders in the Backlog You are given a 2D integer array orders, where each orders[i] = [pricei, amounti, orderTypei] denotes that amounti orders have been placed of type orderTypei at... | Medium | Very Likely | arrayheap-priority-queuesimulation | Solve |
Restore the Array From Adjacent Pairs There is an integer array nums that consists of n unique elements, but you have forgotten it. However, you do remember every pair of adjacent elements in nums. | Medium | Very Likely | arrayhash-tabledepth-first-search | Solve |
Check if There is a Valid Path in a Grid You are given an m x n grid. Each cell of grid represents a street. The street of grid[i][j] can be: | Medium | Very Likely | arraydepth-first-searchbreadth-first-search | Solve |
Count the Number of Consistent Strings You are given a string allowed consisting of distinct characters and an array of strings words. A string is consistent if all characters in the string appear in... | Easy | Very Likely | arrayhash-tablestring | Solve |
Capital Gain/Loss Table: Stocks | Medium | Very Likely | database | Solve |
Count Good Meals A good meal is a meal that contains exactly two different food items with a sum of deliciousness equal to a power of two. | Medium | Very Likely | arrayhash-table | Solve |
Ways to Split Array Into Three Subarrays A split of an integer array is good if: | Medium | Very Likely | arraytwo-pointersbinary-search | Solve |
Top K Frequent Words Given an array of strings words and an integer k, return the k most frequent strings. | Medium | Very Likely | arrayhash-tablestring | 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 | Likely | arraydynamic-programming | Solve |
Text Justification Given an array of strings words and a width maxWidth, format the text such that each line has exactly maxWidth characters and is fully (left and right) justifie... | Hard | Likely | arraystringsimulation | Solve |
Minesweeper Let's play the minesweeper game (Wikipedia, online game)! | Medium | Likely | arraydepth-first-searchbreadth-first-search | Solve |
Employee Importance You have a data structure of employee information, including the employee's unique ID, importance value, and direct subordinates' IDs. | Medium | Likely | arrayhash-tabletree | Solve |
Top K Frequent Elements Given an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order. | Medium | Likely | arrayhash-tabledivide-and-conquer | Solve |
Defanging an IP Address Given a valid (IPv4) IP address, return a defanged version of that IP address. | Easy | Likely | string | Solve |
Number of Orders in the Backlog
SolveYou are given a 2D integer array orders, where each orders[i] = [pricei, amounti, orderTypei] denotes that amounti orders have been placed of type orderTypei at...
Restore the Array From Adjacent Pairs
SolveThere is an integer array nums that consists of n unique elements, but you have forgotten it. However, you do remember every pair of adjacent elements in nums.
Check if There is a Valid Path in a Grid
SolveYou are given an m x n grid. Each cell of grid represents a street. The street of grid[i][j] can be:
Count the Number of Consistent Strings
SolveYou are given a string allowed consisting of distinct characters and an array of strings words. A string is consistent if all characters in the string appear in...
Count Good Meals
SolveA good meal is a meal that contains exactly two different food items with a sum of deliciousness equal to a power of two.
Ways to Split Array Into Three Subarrays
SolveA split of an integer array is good if:
Top K Frequent Words
SolveGiven an array of strings words and an integer k, return the k most frequent strings.
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.
Text Justification
SolveGiven an array of strings words and a width maxWidth, format the text such that each line has exactly maxWidth characters and is fully (left and right) justifie...
Minesweeper
SolveLet's play the minesweeper game (Wikipedia, online game)!
Employee Importance
SolveYou have a data structure of employee information, including the employee's unique ID, importance value, and direct subordinates' IDs.
Top K Frequent Elements
SolveGiven an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order.
Defanging an IP Address
SolveGiven a valid (IPv4) IP address, return a defanged version of that IP address.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Robinhood interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Robinhood interviews focus heavily on array, hash-table, depth-first-search 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. Robinhood 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.
Looking for more companies? Browse all 458 companies in our directory, or sharpen your fundamentals with our free data structure visualizers and AI-powered DSA tutor.
Robinhood has been reported to ask 14 distinct coding problems. The most common topics are array, hash-table, depth-first-search. 3 are Easy difficulty, 10 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 14 reported problems, Robinhood interviews are easier than average - only 7% Hard compared to 18% across all companies. 71% 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, depth-first-search. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
Simulate a real Robinhood coding interview with an AI interviewer. Get a scorecard with specific feedback on your problem-solving, code quality, and communication.
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