<form id="submitform" action="/action/submit" method="POST" enctype="multipart/form-data" role="form">
<input type="hidden" name="problem" value="problem_id">
<input type="hidden" name="contest" value="contest_id">
<form id="submitform" action="/action/submit" method="POST" enctype="multipart/form-data" role="form">
<input type="hidden" name="problem" value="problem_id">
<input type="hidden" name="contest" value="contest_id">