It was a campus recruitment. They had limited time, so they allowed everyone to appear for the first two rounds of interviews.

Then, they selected 6 students out of 150. These students proceeded to two more technical rounds, followed by a final HR round. Only one student was ultimately selected.

Round 1: 30 aptitude questions and 30 technical questions on computer networks, algorithms, C program output, and C++ and Java snippet analysis. All were multiple-choice questions.

Round 2: Coding Test. 4 major questions with a 75-minute time limit.

Round 3: Participants were asked to explain basic Java concepts like inheritance and polymorphism, along with some Operating Systems and DBMS questions.

Round 4: Difficult and advanced technical questions on tricky algorithms, such as external sorting.

Round 5: HR.

1. Given an array of strings, return a string consisting of 0s and 1s where 0 at position i means that string i is a pangram. If not, return 1.

2. Given a preorder traversal of a Binary Search Tree, print "Yes" if it's valid, otherwise print "No".

3. Given a digit in decimal, convert it to binary and print the 4th binary digit as output.