thank you, how can we find which elements have deleted? how can we save it in an array? thank you very much

It depends. Are there any other requirements that you are going to dribble out?

I would not use the approach I gave if I wanted to save what was removed. I would probably use splice instead. Additional requirements may change that answer.

--MidLifeXis

Your questions are a little vague, but maybe this will help:

#! perl
use strict;
use warnings;

my @array = ('a' .. 'e');
print 'Original @array contents: ', join(', ', @array),  "\n";
my @popped;

unshift @popped, pop @array for 1 .. 3;

print '@array now contains:      ', join(', ', @array),  "\n";
print 'The deleted elements:     ', join(', ', @popped), "\n";
[download]

Output:

Original @array contents: a, b, c, d, e
@array now contains:      a, b
The deleted elements:     c, d, e
[download]

See also Data: Arrays.

Athanasius <°(((>< contra mundum

or more clearly, concisely and efficiently:

#! perl
use strict;
use warnings;

my @array = ('a' .. 'e');
print 'Original @array contents: ', join(', ', @array),  "\n";
my @popped = splice @array, 0, 3;

print '@array now contains:      ', join(', ', @array),  "\n";
print 'The deleted elements:     ', join(', ', @popped), "\n";
[download]

splice is your friend.

True laziness is hard work