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Actually in my case, I can't remember that because I was never taught or shown that at the beginning.

I literally just figured it out myself because I tried (++w) instead of (w++) and then it...

So basically, the first real line of output you show, I get. One points to 6 (that's r at the beginning) and then w points to the one right after it from w++.

My bag is, *(w++) = 1 and *r = 6 so...

I think what's confusing me the most is


*(w++) = *r;


In the beginning, r and w are equal to each other, the iterator returned from k.begin() and that's fine. I use begin() all the time.
...

Basically, lines 74 though 84 of the output are where I'm confused. I just printed the addresses and the values of them and they were both 1 in the block above but now suddenly in the original...

Here's the link : c++ - How to make elements of vector unique? (remove non adjacent duplicates) - Stack Overflow

I get that insert() returns a pair of <iterator, bool> which is fine so I get what...