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}?@{$self->{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;