...
	for ($i=0; $i<$n; $i++) {
		if ($n - $i < $length_best) {
			echo '<br/><br/>End = ' . $i . '. Saved ' . ($n - $i) . ' steps.';
			break;
		}
		
		if ($arr[$i] == 0 && $last == 0) {
			$length++;
			if ($length > $length_best) {
				$length_best = $length;
				$first_best = $first;
				$last_best = $i;
			}
		} else if ($arr[$i] == 0 && $last != 0) {
			// optimalizace
			if ($length_best > 0 && $arr[$i+$length_best] != 0) {
				echo '<br/>Jump from ' . $i . ' -> ' . ($length_best + $i);
				$i += $length_best;
				$save += $length_best;
			}
			$first = $i;
			$length = 1;
		} else {
			$first = -1;
			$length = 0;
		}
		$last = $arr[$i];
	}
...

			    function reduce () {
			        if (parseInt($('#a_no').text()) > 0) {
		            	$('#a_no').text(parseInt($('#a_no').text()) - 1);
		        	} else {
		            	window.clearInterval(red);
		            	$('#a_add').css('visibility', 'hidden');
		            	echo('všechny body byly pro nečinnost ztraceny...', 5000);
		                stop = run = false;
		            }