Replacing Element with n+2

#1

why the -ve elements are replaced with n+2 and not with n+1

#2

You have to ignore the negative numbers in this question.
So we replace it with a positive integer which is greater than all possible answers.
For an array of size n, the first missing positive number will always be in range [1,n+1]
So here we can replace negative numbers with any number >n+1.

#3

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