Expedia Group SDE Intern Interview Questions and Answers

2 DSA questions and 70 minutes.

Q1. Implement Min-stack using O(N) space .
Ans. 
Min-stack is implemented using O(N) space by keeping track of minimum value at each element.
• Use two stacks - one to store the actual elements and another to store the minimum value at each step.

• When pushing an element, check if it is smaller than the current minimum and update the minimum stack accordingly.

• When popping an element, also pop from the minimum stack if the popped element is the current minimum.
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Q2. Sliding Window Problem.
Ans. 
Sliding Window Problem involves finding a subarray of fixed size k with the maximum sum.
• Use a sliding window approach to iterate through the array and keep track of the sum of elements within the window.

• Slide the window by removing the first element and adding the next element in each iteration.

• Keep track of the maximum sum found so far and update it if a new maximum is found.
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This round had questions from various topics like DBMS, system design, OOPs, aptitude etc. with one coding ques.

This had 2 coding questions (medium level) and a digital HR round where we just have to use a slider to answer our best reaction to situations.

Q1. Implementation of Min Stack
Ans. 
Implement a stack that supports push, pop, top, and retrieving the minimum element in constant time.
• Use two stacks - one to store the actual elements and another to store the minimum values.

• When pushing an element, check if it is smaller than the current minimum and push it to the min stack if so.

• When popping an element, check if it is the current minimum and pop from the min stack if so.

• Top operation can be implemente...read more
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Q2. Find leaf nodes in a binary tree ,followed by printing path to leaf nodes.
Ans. 
Find leaf nodes in a binary tree and print path to each leaf node.
• Traverse the binary tree using depth-first search (DFS)

• When reaching a leaf node, store the path from root to that leaf node

• Repeat the process for all leaf nodes in the tree
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I was asked to do a string based hard level question. Interviewerr asked me how the code worked and the logic which i explained step by step.

2 hours mcqs from all cse related topics + 1 coding question

3 coding questions easy level

Q1. I do not remember
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OA + behavioural questions

Q1. Leetcode medium
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Q1. Leetcode medium
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It was a 2 hour test having 2 coding questions . Difficulty was easy and medium.

Q1. Two questions were asked . To make a BST from array elements . Snakes and ladder. Besides this interviewer also asked about my projects and basic introduction.
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