Problem database last updated: June 20, 2025
12 problems · 1 Easy, 10 Medium, 1 Hard · Ranked #125 of 458
1 Easy
8% · avg 23%
10 Medium
83% · avg 59%
1 Hard
8% · avg 18%
Based on 12 reported problems, Ripple interviews are in line with industry averages - 8% Hard vs 18% overall. The majority (83%) 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, Ripple puts unusual emphasis on prefix-sum (16.7% of problems, 5x the industry average), design (16.7% of problems, 2.9x the industry average), linked-list (16.7% of problems, 2.3x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (50%), hash-table (41.7%), string (25%), linked-list (16.7%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
LRU Cache Design a data structure that follows the constraints of a Least Recently Used (LRU) cache. | Medium | Very Likely | hash-tablelinked-listdesign | Solve |
Group Anagrams Given an array of strings strs, group the anagrams together. You can return the answer in any order. | Medium | Very Likely | arrayhash-tablestring | Solve |
String Compression Given an array of characters chars, compress it using the following algorithm: | Medium | Very Likely | two-pointersstring | Solve |
Merge Intervals Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cove... | Medium | Very Likely | arraysorting | Solve |
Basic Calculator Given a string s representing a valid expression, implement a basic calculator to evaluate it, and return the result of the evaluation. | Hard | Very Likely | mathstringstack | Solve |
Stock Price Fluctuation You are given a stream of records about a particular stock. Each record contains a timestamp and the corresponding price of the stock at that timestamp. | Medium | Very Likely | hash-tabledesignheap-priority-queue | Solve |
Product Sales Analysis I Table: Sales | Easy | Very Likely | database | Solve |
Subarray Sum Equals K Given an array of integers nums and an integer k, return the total number of subarrays whose sum equals to k. | Medium | Very Likely | arrayhash-tableprefix-sum | Solve |
Linked List Cycle II Given the head of a linked list, return the node where the cycle begins. If there is no cycle, return null. | Medium | Very Likely | hash-tablelinked-listtwo-pointers | Solve |
Maximum Subarray Given an integer array nums, find the subarray with the largest sum, and return its sum. | Medium | Very Likely | arraydivide-and-conquerdynamic-programming | Solve |
Product of Array Except Self Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i]. | Medium | Very Likely | arrayprefix-sum | Solve |
Koko Eating Bananas Koko loves to eat bananas. There are n piles of bananas, the ith pile has piles[i] bananas. The guards have gone and will come back in h hours. | Medium | Very Likely | arraybinary-search | Solve |
LRU Cache
SolveDesign a data structure that follows the constraints of a Least Recently Used (LRU) cache.
Group Anagrams
SolveGiven an array of strings strs, group the anagrams together. You can return the answer in any order.
String Compression
SolveGiven an array of characters chars, compress it using the following algorithm:
Merge Intervals
SolveGiven an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cove...
Basic Calculator
SolveGiven a string s representing a valid expression, implement a basic calculator to evaluate it, and return the result of the evaluation.
Stock Price Fluctuation
SolveYou are given a stream of records about a particular stock. Each record contains a timestamp and the corresponding price of the stock at that timestamp.
Subarray Sum Equals K
SolveGiven an array of integers nums and an integer k, return the total number of subarrays whose sum equals to k.
Linked List Cycle II
SolveGiven the head of a linked list, return the node where the cycle begins. If there is no cycle, return null.
Maximum Subarray
SolveGiven an integer array nums, find the subarray with the largest sum, and return its sum.
Product of Array Except Self
SolveGiven an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i].
Koko Eating Bananas
SolveKoko loves to eat bananas. There are n piles of bananas, the ith pile has piles[i] bananas. The guards have gone and will come back in h hours.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Ripple interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Ripple interviews focus heavily on array, hash-table, 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. Ripple 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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Ripple has been reported to ask 12 distinct coding problems. The most common topics are array, hash-table, string. 1 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 12 reported problems, Ripple interviews are in line with industry averages - 8% Hard vs 18% overall. 83% 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, 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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