Groupon Software Development Engineer II Interview Questions and Answers for Experienced

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Q1. About Database?
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Q2. Which Programming language use describe?
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I would describe the programming language I use as versatile, efficient, and widely used in various industries.
• One of the most popular programming languages in the world

• Known for its flexibility and scalability

• Utilized in web development, data analysis, artificial intelligence, and more

• Examples include Python, Java, C++, and JavaScript
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Q3. About language C,C++ and Java
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Q4. About Data structure
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Q5. About Data security.
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Level order traversal, buy and sell stock 2

Round duration - 45 minutes
Round difficulty - Easy

This was a coding test with 2 DSA questions.

Q1. 
Merge Two Sorted Arrays Problem Statement
Given two sorted integer arrays ARR1 and ARR2 of size M and N, respectively, merge them into ARR1 as one sorted array. Assume that ARR1 has a size of M + N to hol...read more
Ans. 
Merge two sorted arrays into one sorted array in place.
• Iterate from the end of both arrays and compare elements to merge in place

• Use two pointers to keep track of the current position in each array

• Handle cases where one array is fully merged before the other
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Q2. 
Count Ways to Reach the Nth Stair
Given a number of stairs, starting from the 0th stair, calculate the number of distinct ways you can reach the Nth stair. You can climb either one step or two steps at a ...read more
Ans. 
The question is about calculating the number of distinct ways to reach the Nth stair by climbing one or two steps at a time.
• Use dynamic programming to solve this problem efficiently.

• Define a recursive function to calculate the number of ways to reach each stair.

• Consider base cases for 0 and 1 stairs.

• Use memoization to store intermediate results and avoid redundant calculations.

• Handle large values of N by taking modulo ...read more
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Round duration - 60 minutes
Round difficulty - Medium

This was the first round with questions on DSA and Low Level design.

Q1. 
Trapping Rain Water Problem Statement
You are given a long type array/list ARR of size N, representing an elevation map. The value ARR[i] denotes the elevation of the ith bar. Your task is to determine th...read more
Ans. 
Calculate the total amount of rainwater that can be trapped between given elevations in an array.
• Iterate through the array and calculate the maximum height on the left and right of each bar.

• Calculate the amount of water that can be trapped at each bar by taking the minimum of the maximum heights on the left and right.

• Sum up the trapped water at each bar to get the total trapped water for the entire array.
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Q2. Can you provide a low-level design of a hotel management system?
Ans. 
A low-level design of a hotel management system involves detailing the system's components and their interactions.
• Define classes for entities like Room, Guest, Reservation, and Staff

• Implement functions for booking rooms, checking availability, and managing guest information

• Include modules for billing, housekeeping, and reporting

• Utilize databases for storing information and APIs for external integrations
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DSA - arrays, hashing, stack, 2hrs , google meet

Q1. Low level design , OOPs, modular code,
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Q2. Crickbuzz- players, teams, score
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Q1. Sort colours or the dutch flag problem
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The Dutch Flag problem involves sorting an array of strings with three possible values in a specific order.
• Create three pointers to keep track of the boundaries of each color group

• Iterate through the array and swap elements to group them in the correct order

• Time complexity of O(n) can be achieved by a single pass through the array
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Q1. Rain water problem
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The rain water problem involves calculating the amount of rainwater that can be trapped between buildings or structures.
• Calculate the maximum height of water that can be trapped at each position

• Subtract the height of the building at each position to get the water level

• Sum up the water levels at each position to get the total amount of trapped rainwater
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Q2. 2 sum problemjijo
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Q1. Rotate array leetcode question
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Q2. Longest palindormic substring
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A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward.
• Use dynamic programming to solve this problem efficiently.

• Iterate through the string and expand around each character to find the longest palindrome.

• Consider both odd and even length palindromes.

• Example: Input 'babad', Output 'aba' or 'bab'.
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Q1. Print all the subsequences of a string
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Generate all possible subsequences of a given string.
• Use recursion to generate all possible combinations of characters in the string.

• At each step, include or exclude the current character to form subsequences.

• Store each subsequence in an array of strings.
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Q2. Print longest substring with k unique values
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Find and print the longest substring with k unique characters in an array of strings.
• Iterate through the array of strings and keep track of the longest substring with k unique characters.

• Use a sliding window approach to efficiently find the longest substring.

• Keep a hashmap to store the frequency of characters in the current window.

• Update the window boundaries based on the number of unique characters.

• Return the longest
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Q1. Behaviour quesions
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Dsa and alogorithm by third party agency.

Q1. One Dynamic programming question
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