I have written my doubt in the code itself

#1
#2

hello @laksh.rustagi12

dont pass compare funtion in the lower bound. that compare function will make it act as upper bound.

#3

rather I should use upper_bound and subtract 1 from index.
I don’t know why prateek bhaiya has gone the long way

#4

yeah u can ,he just want to show that we can change the functionality of these functions as per our need.

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