15 questions · from 3 interviews
Groupon interview questions
Every question candidates reported from their Groupon interviews, most frequently asked first. Each links to the write-up it came from, so you can see the round and how it went.
Groupon coding and DSA questions
- 01
Decode Ways
A message containing letters from A-Z can be encoded into numbers. Given a string s containing only digits, return the number of ways to decode it.
Medium · From GROUPON Sde3 Interview Experience
- 02
Minimum Operations to Empty Binary String via Non-Palindromic Subsequence Removal
Given a string of 0s and 1s, you can remove any non-palindromic subsequence in one operation. Return the minimum number of operations required to make the string empty.
Easy · From Groupon | SDE3 | Banglore | December 2024 [Reject]
- 03
Best Time to Buy and Sell Stock with Transaction Fee
Given the daily prices of a stock, maximize your profit by making as many buy-and-sell transactions as you want. There is a fixed fee for each sell transaction.
Medium · From Groupon | SDE3 | Banglore | December 2024 [Reject]
- 04
Count Ways to Sum using 1-N numbers
This problem asks to count the number of ways to sum using numbers from 1 to N.
- 05
Count Number of incorrect product prices
The problem involved counting the number of incorrect product prices.
- 06
3Sum
Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j , i != k , and j != k , and nums[i] + nums[j] + nums[k] == 0 . Notice that the solution set must not contain duplicate triplets.
- 07
Best Time to Buy and Sell Stock II
You are given an integer array prices where prices[i] is the price of a given stock on the i th day. On each day, you may decide to buy and/or sell the stock. You can only hold at most one share of the stock at any time. However, you can buy it then…
- 08
LRU and LFU Caches
Discussion on Least Recently Used (LRU) and Least Frequently Used (LFU) caching mechanisms.
Groupon system design questions
- 01
Design Twitter
Design a system like Twitter, focusing on scalability, reliability, and key features such as posting tweets, following users, and generating timelines.
Hard · From GROUPON Sde3 Interview Experience
- 02
Design a Notification System
Design a notification system, handling critical/non-critical notifications separately.
- 03
Design Vendor Product Availability System
Groupon has tie-ups with external vendors, but they cannot make real-time calls to check product availability. How would you design a system to handle this? The interviewer hinted at how platforms like BookMyShow handle ticket bookings. He also suggested that…
- 04
Design a Notification System (SaaS)
Design a scalable system for sending notifications, structured as a Software as a Service. I discussed aspects like Rate Limiting, Horizontal Scaling, and strategies for sending messages to offline users.
Groupon behavioural and HR questions
- 01
Handling Team Conflicts
How do you handle conflicts within/across teams?
- 02
Staying Updated with Tech
How do you keep yourself updated with the latest tech?
Groupon other questions
- 01
Concurrency Primitives in Java
Discussion on Java concurrency primitives: Synchronized keyword, Atomic Variables , and Volatile keyword.
Groupon interview questions FAQ
What questions are asked in Groupon interviews?
Candidates reported 15 distinct questions across 3 Groupon interviews. 8 coding and DSA questions, 4 system design questions, 2 behavioural and HR questions, 1 other questions.