Regarding factorization of a programm using Sieve

#1

I have a doubt in the program I have commented it. Please help me out.

#2

hello @sarthak_singhal
please read about reference variable
and difference between pass by value and pass by reference.
after that u can easily understand why we are using & before prime

#3

Now I have understand the concept behind “&” but I have come across another doubt. I have commented it in same program regarding iterator .

#4

use for(auto k : some vector) we iterator of vector values , k is not itertator , its value

#5

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