use 5.12.0;
use strict;
use warnings;
use Data::Dump;
use Data::Dumper;
##########################################
system('clear');
# 1. Configuration
my  @required_keys;
my %hist1 = map { $_ => 0 } @required_keys;
my %hist2 = map { $_ => 0 } @required_keys;
my %hist3 = map { $_ => 0 } @required_keys;

while (my $line = <DATA>) {
  chomp($line);
  my @element = split (/ +/,$line);
  my $col0= shift @element; #use element[0] as switch and drop from histogram
  if( $col0==1){
    %hist1 = map { $_ => 0 } @element;
  }elsif( $col0==0){
    %hist2 = map { $_ => 0 } @element;
  }elsif( $col0==5){
    %hist3 = map { $_ => 0 } @element
  }else{
    #do stuff here when all else fails, undef/NaNs
    print "WTF \n";
  }
};

dd \%hist1;   # Verify hash contents
dd \%hist2;   # Verify hash contents
dd \%hist3;   # Verify hash contents

__DATA__
0 1 0 2 68fd1e64 80e26c9b 1f89b562 e5ba7672
0 2 1 2 68fd1e64 f0cf0024 0b153874 07c540c4
0 2 14 2 287e684f 0a519c5c 0b153874 8efede7f
0 0 0 0 68fd1e64 2c16a946 0b153874 1e88c74f
0 3 0 0 8cf07265 ae46a29d 0b153874 1e88c74f
5 0 0 0 05db9164 6c9c9cf3 0b153874 776ce399
0 0 0 1 439a44a4 ad4527a2 0b153874 776ce399
1 1 0 0 68fd1e64 2c16a946 1f89b562 e5ba7672
0 0 8 31 05db9164 d833535f 0b153874 e5ba7672
0 0 1 2 05db9164 510b40a5 0b153874 d4bb7bd8
5 0 0 5 05db9164 0468d672 0b153874 776ce399
0 0 6 7 05db9164 9b5fd12f 0b153874 d4bb7bd8
1 0 0 0 241546e0 38a947a1 1f89b562 e5ba7672
1 0 5 4 be589b51 287130e0 361384ce 07c540c4
0 0 4 4 5a9ed9b0 80e26c9b 0b153874 3486227d
0 0 18 1 05db9164 bc6e3dc1 64523cfa 776ce399
1 1 2 2 68fd1e64 38d50e09 0b153874 d4bb7bd8
0 0 0 5 8cf07265 7cd19acc 0b153874 e5ba7672
0 0 2 10 05db9164 f0cf0024 37e4aa92 e5ba7672
0 7 3 15 3c9d8785 b0660259 0b153874 e5ba7672


##</code><code>##

{
  "0b153874" => 0,
  "1" => 0,
  "2" => 0,
  "38d50e09" => 0,
  "68fd1e64" => 0,
  "d4bb7bd8" => 0,
}
{
  "0b153874" => 0,
  "15" => 0,
  "3" => 0,
  "3c9d8785" => 0,
  "7" => 0,
  "b0660259" => 0,
  "e5ba7672" => 0,
}
{
  "0" => 0,
  "0468d672" => 0,
  "05db9164" => 0,
  "0b153874" => 0,
  "5" => 0,
  "776ce399" => 0,
}