The Selection process started with an Online Coding round.
20 MCQ and 2 Coding Questions:
MCQs were from OOPs, OS, DBMS, Networking etc.
- Rotate the given Matrix by a factor k. Input is given as two integers n,m (row and column of the matrix). Followed by n lines with m space separated integers as all the elements of the matrix. Last line has an integer k.
Input: 3 3 1 2 3 4 5 6 7 8 9 2 Output: 7 4 1 8 5 2 9 6 3
- Given a string. Find all the palindromic partitions of the string. (Number of way the string can be partitioned so that all the partitions are palindrome)
Input: str = "NITIN" OUTPUT: 3 N I T I N N ITI N NITIN
He asked coding questions straight away –
- Add two numbers without using +,- operator, recursion or loop.
Try to think in terms of half adder.
- Postfix to prefix without using recursion.
- Given an array of numbers. What is the largest no possible by concatenating all the numbers together.
Input: 5 21 30 1 9 98 Output: 99830211
- Write the heapify code.
- Level order traversal of a tree. Further he asked to optimise the code.
- Given a matrix. ‘0’ means empty room, ‘1’ means door, ‘-1’ means a wall. For every cell as an empty room find the distance to the nearest door (One cannot go through a wall).
Input: 5 5 0 0 1 -1 1 0 -1 0 0 -1 0 0 -1 0 -1 1 -1 1 0 0 0 0 0 0 0 Output: 2 1 0 -1 0 2 -1 1 2 -1 1 2 -1 2 -1 0 -1 0 1 2 1 2 1 2 3
The door would be replaced with 0 as the distance to the nearest door would be 0.
I started by a backtracking solution. But the guy didn’t know what it was. I gave many more solutions and concluded with an O(N) bfs solution.
Guys answer straight. Do not answer very complex algorithms, even though they are correct. Try to provide as brute-force solution as possible.
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