Here's my version:
@a = (1);
for (1..10) {
print "@a\n";
@na=();
for (@a)
{ $na[-1] == $_ ? $na[-2]++ : push @na, (1, $_) }
@a=@na;
}
It does not move elements
around (assuming push/pop are doing the natural thing) and
has only one temporary copy.
Update: Use [-1] instead of [$#na]. Cool, learned
a new thing!
Update: use ?: instead of if/then
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