 4<br />
1 2<br />
1 3<br />
3 4<br />
4 6<br />
4 5<br />
5 8<br />
5 6<br />
5 7<br />
6 8<br />
6 7<br />
7 9<br />
7 8<br />
8 9<br />
9 11<br />
9 10<br />
10 11<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>37.699111843077446<br />
</span></div></code></pre></div></div></div></div></div><div class="row"><div class="column"><h