ative; overflow: hidden;"><div class=content><div>&nbsp; 第一行1个数n,表示顶点数</div>
<div>&nbsp; 接下来n行,每行一个点,按逆时针描述这个图形</div>
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<p></p></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=content><div>若答案不存在,输出&quot;NO&quot;,否则输出X1,Y1,X2,