1). I have given array I have to find number of repeated element and number of non repeated element. 2). They ask given a string and I have to find first non repeating character in string 3). 3rd question they ask from binary tree. It's medium level leetcode question. 4) 4th one from dp on string. Given a string and I have to find palindrome.(It's a striver dp series question, Unluckily I have not solve only this question. I did not expect that they will go to dp on string. Before interview I have revise till dp on subsequence. But unluckily they asked question from LCS variant. 5) It's kadane's algorithm question with slightly modifications