I applied through other source. The process took 1 day.

There were 4 rounds, 1)First round Java with Test Automation (mostly they will validate how strong in Java concepts and Test automation framework design) 2)Second round, test case enumeration (given a scenario we need to come up with possible test scenarios) 3)Third round, Data Structures and algorithms (question on time complexity calculation, different data structures worked so far and their practical usage)

Check whether string of brackets are balanced, "([])" is balanced "({]" is not balanced

Java string, replace ab with bba recursively E.g: "aaba" then replace "abbaa" again ab is present so replace it like "bbabaa"