#!/usr/bin/perl
use strict; # https://perlmonks.org/?node_id=11123870
use warnings;
use List::Util qw( uniq );
print "$_\n" for find( 100, '1 99 2 40 50 60 90 3 5 95 100' );
print "\n";
print "$_\n" for find( 100, '5 5 5 5 10 15 80 99' );
sub find
{
my ($target, $from, $have) = @_;
$have //= '';
$target == 0 and return $have =~ s/.//r;
$target > 0 && $from =~ s/\d+// or return ();
uniq find( $target - $&, $from, "$have+$&"), find( $target, $from,
+$have );
}
Outputs:
1+99
2+40+50+3+5
2+90+3+5
2+3+95
40+60
5+95
100
5+5+5+5+80
5+5+10+80
5+15+80
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