a>4<br />
2 5 1<br />
9 10 4<br />
6 8 2<br />
4 6 3<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>16<br />
<br />
OUTPUT DETAILS:<br />
<br />
The first building overlaps with the fourth building for an area of 1<br />
square unit, so the total area is just 3*1 + 1*4 + 2*2 + 2*3 - 1 = 16.</span></div></code></pre></div></div></div></div><