How often are these problems asked?
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Roku interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Problem database last updated: June 20, 2025
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Roku Coding Interview Questions
15 problems · 3 Easy, 8 Medium, 4 Hard · Ranked #113 of 458
Difficulty breakdown
3 Easy
20% · avg 23%
8 Medium
53% · avg 59%
4 Hard
27% · avg 18%
Top topics
string
46.7%1.7x
array
46.7%
stack
33.3%3.9x
hash-table
20%
sliding-window
20%4.3x
math
20%1.6x
Interview profile
Based on 15 reported problems, Roku interviews are slightly harder than average - 27% Hard vs 18% across all companies. The majority (53%) 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, Roku puts unusual emphasis on simulation (20% of problems, 4.6x the industry average), sliding-window (20% of problems, 4.3x the industry average), stack (33.3% of problems, 3.9x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are string (46.7%), array (46.7%), stack (33.3%), hash-table (20%). Problems below are sorted by frequency, the ones at the top are asked most often.
All 15 problems
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Substring with Concatenation of All Words You are given a string s and an array of strings words. All the strings of words are of the same length. | Hard | Very Likely | hash-tablestringsliding-window | 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 |
Sliding Window Maximum You are given an array of integers nums, there is a sliding window of size k which is moving from the very left of the array to the very right. You can only see... | Hard | Very Likely | arrayqueuesliding-window | Solve |
Simplify Path You are given an absolute path for a Unix-style file system, which always begins with a slash '/'. Your task is to transform this absolute path into its simplif... | Medium | Very Likely | stringstack | Solve |
Multiply Strings Given two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2, also represented as a string. | Medium | Very Likely | mathstringsimulation | Solve |
Shortest Path to Get All Keys You are given an m x n grid grid where: | Hard | Very Likely | arraybit-manipulationbreadth-first-search | 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 |
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 | Very Likely | arrayhash-tabledivide-and-conquer | Solve |
Valid Palindrome II Given a string s, return true if the s can be palindrome after deleting at most one character from it. | Easy | Very Likely | two-pointersstringgreedy | Solve |
Max Consecutive Ones III Given a binary array nums and an integer k, return the maximum number of consecutive 1's in the array if you can flip at most k 0's. | Medium | Very Likely | arraybinary-searchsliding-window | Solve |
Maximum Product of Three Numbers Given an integer array nums, find three numbers whose product is maximum and return the maximum product. | Easy | Very Likely | arraymathsorting | Solve |
Asteroid Collision We are given an array asteroids of integers representing asteroids in a row. The indices of the asteroid in the array represent their relative position in space... | Medium | Very Likely | arraystacksimulation | Solve |
24 Game You are given an integer array cards of length 4. You have four cards, each containing a number in the range [1, 9]. You should arrange the numbers on these car... | Hard | Very Likely | arraymathbacktracking | Solve |
Decode String Given an encoded string, return its decoded string. | Medium | Very Likely | stringstackrecursion | Solve |
Backspace String Compare Given two strings s and t, return true if they are equal when both are typed into empty text editors. '' means a backspace character. | Easy | Very Likely | two-pointersstringstack | Solve |
Substring with Concatenation of All Words
SolveYou are given a string s and an array of strings words. All the strings of words are of the same length.
HardVery Likely
hash-tablestringsliding-window
LRU Cache
SolveDesign a data structure that follows the constraints of a Least Recently Used (LRU) cache.
MediumVery Likely
hash-tablelinked-listdesign
Sliding Window Maximum
SolveYou are given an array of integers nums, there is a sliding window of size k which is moving from the very left of the array to the very right. You can only see...
HardVery Likely
arrayqueuesliding-window
Simplify Path
SolveYou are given an absolute path for a Unix-style file system, which always begins with a slash '/'. Your task is to transform this absolute path into its simplif...
MediumVery Likely
stringstack
Multiply Strings
SolveGiven two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2, also represented as a string.
MediumVery Likely
mathstringsimulation
Shortest Path to Get All Keys
SolveYou are given an m x n grid grid where:
HardVery Likely
arraybit-manipulationbreadth-first-search
Valid Parenthesis String
SolveGiven a string s containing only three types of characters: '(', ')' and '', return true if s is valid.
MediumVery Likely
stringdynamic-programmingstack
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.
MediumVery Likely
arrayhash-tabledivide-and-conquer
Valid Palindrome II
SolveGiven a string s, return true if the s can be palindrome after deleting at most one character from it.
EasyVery Likely
two-pointersstringgreedy
Max Consecutive Ones III
SolveGiven a binary array nums and an integer k, return the maximum number of consecutive 1's in the array if you can flip at most k 0's.
MediumVery Likely
arraybinary-searchsliding-window
Maximum Product of Three Numbers
SolveGiven an integer array nums, find three numbers whose product is maximum and return the maximum product.
EasyVery Likely
arraymathsorting
Asteroid Collision
SolveWe are given an array asteroids of integers representing asteroids in a row. The indices of the asteroid in the array represent their relative position in space...
MediumVery Likely
arraystacksimulation
24 Game
SolveYou are given an integer array cards of length 4. You have four cards, each containing a number in the range [1, 9]. You should arrange the numbers on these car...
HardVery Likely
arraymathbacktracking
Decode String
SolveGiven an encoded string, return its decoded string.
MediumVery Likely
stringstackrecursion
Backspace String Compare
SolveGiven two strings s and t, return true if they are equal when both are typed into empty text editors. '' means a backspace character.
EasyVery Likely
two-pointersstringstack
Preparing for your Roku coding interview
Roku interviews focus heavily on string, array, stack 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. Roku 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.
Frequently Asked Questions
What coding problems does Roku ask in interviews?add
Roku has been reported to ask 15 distinct coding problems. The most common topics are string, array, stack. 3 are Easy difficulty, 8 are Medium, and 4 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
How hard are Roku coding interviews?add
Based on 15 reported problems, Roku interviews are slightly harder than average - 27% Hard vs 18% across all companies. 53% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
How should I prepare for a Roku coding interview?add
Start with the highest-frequency problems listed on this page. Focus on the core topics: string, array, stack. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
Other companies to explore
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