Zscaler Interview Experience for C++ Developer

Round 1-

• Tell me about your projects
• Then followed by some basic oops os questions like friend function, virtual function, polymorphism, deadlock
• Then explain the OA question, then discuss on segment tree(as in the solution I was using a segment tree)
• Then gave a question on bits

(Need to replace the last 4 bits with the last 5th 6th 7th 8th bit )

Round 2

Three DSA questions

1. https://www.w3wiki.net/ways-to-sum-to-n-using-natural-numbers-up-to-k-with-repetitions-allowed/
2. Was similar to the first one based on the dp take not take pattern
3. https://www.w3wiki.net/problems/roll-the-characters-of-a-string2127/1

Then some networking questions like VPN (how it works as well)

• What is tunneling in networking, TCP/IP model with protocol related to each layer

Round 3

• Search in a rotated sorted array
• Then the code itself started asking
• Who is calling main function
• What is this main thing (thread or process)
• He said thread , then asked why it is thread not a process
• Scheduling algorithms(For what these algorithms are used)
• Then dynamic memory allocation
• What is cache where it is located
• When you are running a code how is memory allocated
• Then allot of things in pointers void pointers , smart pointers, typecasting all these pointers kept on asking things by writing something on screen what will be output and so on
• What magic will happen on writing virtual keyword
• Friend function, polymorphism
• Operator overloading (write code)

Round 4

• Was playing with pointers
• Asking me outputs
• Kept on doing stupid things

Then a simple bits question

• Like we have given a number say 5 – 101 binary
• Return a number 11000….30times
• Means shift all set bits to left in 32 bit representation