This is my interview experience at Paytm as SDE Java, Since round 1 was more oriented towards DSA questions interviewer came and gracefully asked me about background workex stacks and then quicky shoot the question on me which was "Longest Substring Without Repeating Characters"

Link : https://leetcode.com/problems/longest-substring-without-repeating-characters/description/

i was able to solve it and explained him the approach. he was satisfued with my code and explaination.

after that he shoot the second question which was a leetcode question too.
"Combination Sum"

Link : https://leetcode.com/problems/combination-sum/description/

just after looking at the question i got into panic mode, but somehow i managed to be calm asked the interview what question demands. he was helpful giving me hints in between as well.

but brainstorming i was able to crack it. and then proceed for code. the moment i wrote base case of the backtrack of the code. he got clear that yes i can code it up.

The interview ended.

VERDICT : selected for Round 2 (System Design Round)