The Nationwide Group interview questions

First round was with HR, they asked behavioral questions Second round was a tech assessment round, I was asked questions around my previous work experience followed by a simple algorithtic question. Q: Given a string, return true when the first occurrence of a duplicate is found. PHP was the programming language Final round was meant to be another tech round. They asked more questions about my past work experiences and how I may be a fit for the team.

Tool used in the past?