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<?php declare(strict_types=1);
/*
 * This file is part of sebastian/diff.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace SebastianBergmann\Diff;
use function array_fill;
use function array_merge;
use function array_reverse;
use function array_slice;
use function count;
use function in_array;
use function max;
final class MemoryEfficientLongestCommonSubsequenceCalculator implements LongestCommonSubsequenceCalculator
{
    /**
     * @inheritDoc
     */
    public function calculate(array $from, array $to): array
    {
        $cFrom = count($from);
        $cTo   = count($to);
        if ($cFrom === 0) {
            return [];
        }
        if ($cFrom === 1) {
            if (in_array($from[0], $to, true)) {
                return [$from[0]];
            }
            return [];
        }
        $i         = (int) ($cFrom / 2);
        $fromStart = array_slice($from, 0, $i);
        $fromEnd   = array_slice($from, $i);
        $llB       = $this->length($fromStart, $to);
 
 
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