DE Shaw Interview Experience (Off-Campus)
First Round was a Coding round which included 2 coding Questions both medium type and 40 Aptitude Questions which were really hard to answer.
PlatForm _ Hackerrank
1-Find number of substrings in a string which contains ‘a’, ‘b’, ‘c’
number-of-substrings- containing-all-three- characters/
2- 2nd Question was related to graph which could be solved using BFS and DFS
Aptitude Questions were really HardTotal 40 Questions
1- 20 Technical which covers areas like SQL, Networking, OS, Threading, BigO Complexity etc
2- 20 Logical which was based on Probability, Permutation and Logical Questions like in JEE Mains.
Round 2 – Code Pair
This Round was online Coding and Interview Round in which you have to solve some Coding Questions in front of Interviewer and present the best optimal solution
Questions 1- Create Copy of a binary tree with an extra random pointer to any of its node
I solved it using HashMap using O(N) time complexity but the interviewer wants O(log(N))
You first have to create a tree copy with left and right child storing mapping of an old pointer to new one using HashMap and then map the random pointer in the new tree.
Delete all element in the linked list whose value is less than x
This was an easy one and you can easily pass all test cases
1- Garbage Collector in Java
2- Why we use static in Java
3-How HashMap are Implemented
I was able to answer all but lacked presentation style.
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