Hi Monks,

UPDATE:

I have figured out what's the problem, I was using qw{1, 1} to construct the array, then the first element is "1," and the other one is "1", thanks for your attention, embarrassing...

I encountered a subroutine like the following: 
sub remove_dup {
    my @arr = shift;
    my %seen;

    for ( my $i = 0; $i <= $#{$arr}; ){
        splice @$arr, --$i, 1
            if $seen{$arr->[ $i++]}++;
    }
}

[download]

It intended to remove the duplicated elements in the array, but when the element is the last one in the array, it can't be removed?

just like {1,1} can't be changed to {1}, but {1,1,2} will be changed to {1,2}.

Can anyone give a hint?

In reply to Can't remove the the duplicate element when it's the last one in the array by littlehorse

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