I applied through an employee referral.

It could have been better and more structured, rather than the interviewer searching for questions on the call itself. He or she should be better prepared for a candidate. Other than that, the compensation that they were offering was good.

DSA:

• Colliding balls: There are 2 arrays, strength and direction. It's a 1-D axis, and balls can move in the left or right direction. Give the number of balls remaining after all collisions have happened. It should have been approached by stack, but I tried with a hash map and yet failed.
• String alteration regarding greedy method.