ana; mso-hansi-font-family: Verdana; mso-fareast-font-family: SimSun"><b>其中</b></span><span style="font-family: Verdana; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-fareast-font-family: SimSun"><b><span style="mso-spacerun: yes">&nbsp; </span>N &lt;= 30 , M &lt;= 50 </b></span></span></div>
<div style="mso-line-spacing: '100 50 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1"></div>
</div></div></div></div></div><div class="row"><div class="column"><h4 class="ui top attached bloc