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#!/usr/bin/perl
#Copyright 2008 Arthur S Goldstein
use Test::More tests => 9;

my $loaded = 1;

  package fifteen;

  sub new {return bless {}}
  sub set_position {my $self = shift;
    my $string = shift;
    my @lines = split /\n/, $string;
    my $row = 0;
    foreach my $line (@lines) {
      my @numbers = split /\s+/, $line;
      $self->{board}->[$row] = \@numbers;
      foreach my $count (0..$#numbers) {
        if ($numbers[$count] == 0) {
          $self->{zero_at} = [$row, $count];
        }
      }
      $row++;
    }
  }
  sub value {
    my $self = shift;
    my $value;
    foreach my $row (@{$self->{board}}) {
      $value .= join(' ', @$row)."\n";
    }
    $value .= "zero: ".$self->{zero_at}->[0].$self->{zero_at}->[1];
    return $value;
  }

  sub move {
    my $self = shift;
    my $move = shift;
    $self->{board}->[$self->{zero_at}->[0]]->[$self->{zero_at}->[1]] =
     $self->{board}->[$move->[0]]->[$move->[1]];
    $self->{board}->[$move->[0]]->[$move->[1]] = 0;
    $self->{zero_at} = $move;
  }
  sub lock {
    my $self = shift;
    my $count = 1;
    my $number_locked = 20000;
    if ($self->{board}->[0]->[0] == 1) {
      $self->{locked}->[0]->[0] = 1;
      $number_locked = $number_locked - 100;
    }
    else {
      for my $i (0..3) {
        for my $j (0..3) {
          if (($self->{board}->[$i]->[$j]) == 1) {
            return $number_locked + $i + $j;
          }
        }
      }
    }
    if ($self->{board}->[0]->[1] == 2) {
      $self->{locked}->[0]->[1] = 1;
      $number_locked = $number_locked - 100;
    }
    else {
      for my $i (0..3) {
        for my $j (0..3) {
          if (($self->{board}->[$i]->[$j]) == 2) {
            return $number_locked + $i;
          }