public function problemSubmissions($problems, $start = 0, $end = 2147483648)
    {
        if (is_array($problems) === false) {
            $problems = array($problems);
        }

        $rawSubmissions = $this->load('p/subs', array($problems, $start, $end));
        $submissions = array();

        foreach ($rawSubmissions as $submission) {
            $submissions[] = Helper\formatSubmission($submission);
        }

        return $submissions;
    }