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Here's my take on Q1, which isn't entirely original, but is self-contained:
my @c = do { my %tmp = map { $_ => 1 } @a; grep {$tmp{$_}} @b };
Here's my take on Q2 which ended up the same as others:
for (1..@foo/2) { @foo[$_-1,-$_] = @foo[-$_,$_-1]; }
The first thing that came to mind was:
@foo = map { pop(@foo) } 1..@foo;
But that's not precisely an in-place version, even though you could argue that the temporary "array" only holds things that have been removed from @foo.

In reply to Re: (OT) Interview questions -- your response? by tadman
in thread (OT) Interview questions -- your response? by Ovid

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