The first round was based on DS and Algo questions. I was asked 3 questions in total. I gave correct answers to 2 questions, but I was still rejected. They gave a reason saying I forgot to write one edge case. The interviewer was not interactive. He just gave questions and turned off his camera to continue his work.

Variation of the problem:

Find the first occurred 1 in a sorted 2D matrix which contains only 0's and 1's.

Given a number, find the next smallest palindrome number.

Find if two strings are isomorphic to each other.