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The C questions were very conceptual. Unlike other companies, it did not have output tracing questions. It had questions on asymptotic complexity, recurrence relations and the like.
Write code to reverse a linked list recursively
Write a code to Multiply a number by 7 without using * operator
· Write a code to Multiply a number by 8 without using * operator
· Write a code & pseudo code to find the minimum spanning tree
· RSA Algorithm (very intricate questions from here – what is the significance of phi(n) etc)
· Diffie Hellman Algorithm
· Trace route program implementation (Detailed questions about TTL), ping etc
· IP Headers
· Network Protocols
· Euclidean theorem
· Euler’s totient function
famous game Brainvita
This was a very lengthy program (handling all boundary cases) which required a very in-depth understanding of 2-D matrices.
· Big Endian to Little Endian Conversion
his required concepts of masking and bit-wise operators. After I came up with a code to do the same, I was asked to reduce the space complexity to O(1). 2 minutes of thinking and I managed to do crack it !
The interviewer applauded me for coming up with the most optimal solution possible for this that is used in the industry.
A few more questions on OS were asked and the interviewer was pretty satisfied with the answers
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