LionsAd / service_container

      $xhash[$this->_line_hash($from_lines[$xi])] = 1;

    }

    for ($yi = $skip; $yi < $n_to - $endskip; $yi++) {

      $line = $to_lines[$yi];

      if ($this->ychanged[$yi] = empty($xhash[$this->_line_hash($line)])) {

        continue;

      }

      $yhash[$this->_line_hash($line)] = 1;

      $this->yv[] = $line;

      $this->yind[] = $yi;

    }

    for ($xi = $skip; $xi < $n_from - $endskip; $xi++) {

      $line = $from_lines[$xi];

      if ($this->xchanged[$xi] = empty($yhash[$this->_line_hash($line)])) {

      $this->yv[] = $line;

      $this->yind[] = $yi;

    }

    for ($xi = $skip; $xi < $n_from - $endskip; $xi++) {

      $line = $from_lines[$xi];

      if ($this->xchanged[$xi] = empty($yhash[$this->_line_hash($line)])) {

        continue;

      }

      $this->xv[] = $line;

      $this->xind[] = $xi;

    }

    // Find the LCS.

    $this->_compareseq(0, sizeof($this->xv), 0, sizeof($this->yv));