How to deal with strings in this case?

#1

since in this case no constraints are given,so i tried using strings .How to write code with strings in this question.?

#2

hi @2020uec2022 dont pass string with ref, also u need to backtrack manually by pop_back()
updated

#3

https://ide.codingblocks.com/s/679564 still test cases not passing

#4

Hi @2020uec2022 I’ve given th code after testing please check

#5

where is the code ?

#6


@2020uec2022

#7

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