Please explain the two pointer approach for this question

#1

i am not able to understand the two pointer approach for this question, given in the editorial.

#2

hello @agarwalarjit.agarwal
pls refer this article link
this article has 4 approaches , and to understand 2 pointers u need to understand 1st three approaches first., so i would recommend to read all those approaches , then jump to 2 pointer approach,then watch the animation video , and do a dry run.
even after doing that if u remain with any doubt then feel free to ask

#3

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