dden;"><h4>样例输入</h4><div class="ui existing segment"><pre style="margin-top:0; margin-bottom:0;"><code class="lang-plain">
			<div class=content><span class=sampledata><br />
<br />
4 2 1<br />
<br />
1 2<br />
<br />
5 2<br />
<br />
</span></div></code></pre></div><h4>样例输出</h4><div class="ui existing segment"><pre style="margin-top:0; margin-bottom:0;"><code class="lang-plain">
			<div class=content><span class=sampledata><br />
2 2<br />
<br />
2<br />
</span></div></code></pr