asked dsa, puzzles, applications and oops, the puzzles were mainly based on GFG, DSA the question was on queue implementation using Linked list. A question on DSA application of graphs was also asked.

So, the first couple of rounds at ION were really about seeing if you could actually code. The first one was on HackerEarth, and let me tell you, those three problems were no joke. You really had to think fast and come up with a smart solution. Then, in the second round, they grilled us on data structures and algorithms. They'd give you a problem and you had to write code on the spot, and they were watching every keystroke! It wasn't enough to just get it right, it had to be efficient too.