Project Euler にチャレンジ：Problem 57 PHPでの解答

<?php
$answer = 0;
$pow10 = 10;
$bunbo  = array(0=>2);
$bunshi = array(0=>3);

for($i = 1 ; $i <= 1000 ; $i++)
{
	$count = count($bunshi);
	for($d = 0 ; $d < $count ; $d++)
	{
		$bunshi[$d] = $bunshi[$d] + @$bunbo[$d] + @$bunbo[$d];
		@$bunbo[$d] = $bunshi[$d] - @$bunbo[$d];
	}
	for($d = 0 ; $d < $count ; $d++)
	{
		while($bunshi[$d] >= $pow10)
		{
			$bunshi[$d] -= $pow10;
			@$bunshi[$d + 1]++;
		}
		while($bunbo[$d] >= $pow10)
		{
			$bunbo[$d] -= $pow10;
			@$bunbo[$d + 1]++;
		}
	}
	if(count($bunshi) > count($bunbo))
	{
		$answer++;
	}
}
echo $answer."\n";


?>