#!perl
use strict;
use List::Util 'shuffle';

# parameters
my $size   = 100_000;
my $repeat = 100;

my @col1=(); my @col2=();
my @col3=(); my @col4=();
my @col5=(); my @col6=();
my @col7=(); my @col8=();
my @col9=(); my @col10=();

# create a test file
my $file = 'table.dat';
test_data($file,$size);

# load file into arrays
open IN,'<',$file or die "Could not open $file : $!";
my $total=0;
while (<IN>){
  chomp;
  my @f = split "\t",$_;
  push @col1,$f[1]; push @col2,$f[2];
  push @col3,$f[3]; push @col4,$f[4];
  push @col5,$f[5]; push @col6,$f[6];
  push @col7,$f[7]; push @col8,$f[8];
  push @col9,$f[9]; push @col10,$f[10];
  for my $i (1..10){
    $total += $f[$i];
  }
}
print "$. lines read from $file. Total 1's = $total\n";


my @count=();
my $sum=0;
my $t0 = time();
# shuffle arrays and count
my @c1=(); my @c2=();
my @c3=(); my @c4=();
my @c5=(); my @c6=();
my @c7=(); my @c8=();
my @c9=(); my @c10=();
for my $n (1..$repeat){
 
  @c1 = shuffle @col1; @c2 = shuffle @col2;
  @c3 = shuffle @col3; @c4 = shuffle @col4;
  @c5 = shuffle @col5; @c6 = shuffle @col6;
  @c7 = shuffle @col7; @c8 = shuffle @col8;
  @c9 = shuffle @col9; @c10 = shuffle @col10;
 
  for my $i (1..$size){
    $sum=0;
    $sum += pop @c1; $sum += pop @c2;
    $sum += pop @c3; $sum += pop @c4;
    $sum += pop @c5; $sum += pop @c6;
    $sum += pop @c7; $sum += pop @c8;
    $sum += pop @c9; $sum += pop @c10;
    ++$count[$sum];
  }
}

# report stats
my $total=0;
print "Sum      Count\n";
print "--- ----------\n";
for my $i (1..10){
  printf "%2d  %10d\n",$i,$count[$i];
  $total += $i * $count[$i];
}
print "Total = $total\n";

# run time
my $dur = (time() - $t0);
print "$repeat repeats for $size line table took $dur secs\n";

# test file
sub test_data {
  my ($file,$lines) = @_;
  open OUT,'>',$file or die "Could not open $file : $!";
  for (1..$lines){
    print OUT $_;
    for (1..10){
      print OUT "\t".int rand(2);
    }
    print OUT "\n";
  }
  close OUT;
  print "$lines created in $file\n";
}
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