lass="column"><h4 class="ui top attached block header">样例</h4><div class="ui bottom attached segment font-content"><div style="position: relative; overflow: hidden;"><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>5 <br />
1 2 20 <br />
2 3 12 <br />
2 4 1 <br />
4 5 3 <br />
26 9 <br />
1 10 <br />
500 2 <br />
2 30 </span></div></code></pre></div><h4>样例输出</h4><div cl