The first technical interview lasted for 1.5 hours. He asked me to tell him about myself, my hobbies, and my areas of interest.

After this, he asked about the subjects in which I am good, and I mentioned C, Java, DBMS, Data Structures, and C++.

The second tech interview lasted for 40 minutes. I explained my project for 15 minutes, and then they asked different questions regarding it, which I answered. They then asked about the mistakes I made in the first round. I told them the mistakes I made, and they asked me questions in DBMS and SQL queries, the difference between outer join and inner join, how and when to implement them, and some queries on dates in SQL. They also asked how to find if a loop exists in a linked list and real-life implementations of a stack and queue. They were satisfied with the answers and asked me to wait for HR to contact me.

This time, the third round was also technical and lasted for 40 minutes. He asked me which language I was good in.

I answered C, and he asked if I knew what a palindrome was. I was shocked to hear that question in a third technical round and said I knew what it was. After that, he asked me to write a program, and I wrote it.

He told me it was correct but that I should not use any in-built functions. So, I took another array and wrote a program using that.

Write a program where the user gives many inputs, and we have to concatenate some strings and return them.

How can we put three values into a HashMap?