It may be easier to read, manage and extend this, if it is written in OO style.

Based on corrected BrowserUk's (++) code, I offer: 

use strict;
use warnings;
use Data::Dump qw[ pp ];

#------------------------------------------
{package Event;

    sub new{
      my ($class,@att) = @_;
      return bless {map {$_=>shift(@att)} qw|ID start stop|}, $class ;
    }

    sub Overlaps_with{
      my ($self, $other)=@_;
      return 0 if $self->{start} > $other->{stop};
      return 0 if $self->{stop}  < $other->{start};
      push @{$other->{OVERLAPS}}, $self->{ID},$self->{OVERLAPS}?@{$sel
+f->{OVERLAPS}}:();
      return 1;
    }

    1;
}#---- End of Package Event ------------------

my %tss = map {
    my $s = int( rand 1000 );
    $_ => Event::->new ($_, $s, $s + int (rand 200) );
} 1 .. 15;

pp \%tss;

my @ids = sort{ $a <=> $b } keys %tss;

for my $first ( 0 .. $#ids ) {
    for my $second ( $first+1 .. $#ids ) {
      if ($tss{$ids[$first]}->Overlaps_with ($tss{$ids[$second]})){
         ## print "Deleting $ids[$first]\n";
          delete $tss{ $ids[$first] };
          last;
      }
    }
}

my @x = sort {$a->{start} <=> $b->{start}  } values %tss;
pp \@x;

[download]
This version tracks the deleted item ID's.

             I hope life isn't a big joke, because I don't get it.
                   -SNL

In reply to Re: deleting elements in nested hash structure by NetWallah
in thread deleting elements in nested hash structure by lshadow

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