v><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;第2到N+1行：每行四个整数X1，Y1，X2，Y2，表示围栏的左下角和右上角．X，y&isin;[1．．10^9]，</span></div>
<div><span style="font-size: medium">且X1&lt;X2，Y1&lt;&nbsp;Y2</span></div></div></div></div></div></div><div class="row"><div class="column"><h4 class="ui top attached block header">输出格式</h4><div class="ui bottom attached segment font-content"><div style="position: relative; overflow: hidden;"><div class=c