:p></o:p></span></span></p>
            </td>
        </tr>
    </tbody>
</table>
<div></div>
<div></div>
<p></p></div></div></div></div><div class="row"><div class="column"><h4 class="ui top attached block header">输入格式</h4><div class="ui bottom attached segment font-content"><div style="position: relative; overflow: hidden;"><div class=content><div>输入文件第一行一个正整数N。</div>
<div>
<div>接下来每行一个操作。每条命令除第一个数字之外，</div>
<div>均