<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>3<br />
24 28<br />
15 50<br />
12 21<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>468 1561<br />
2805 9356<br />
or: 	<br />
3 0<br />
0 1<br />
</span></div></code></pre>