b同学都是无限聪明的)。</span></div>
<div><span style="font-size: medium">&nbsp;</span></div></div></div></div></div><div class="row"><div class="column"><h4 class="ui top attached block header">输入格式</h4><div class="ui bottom attached segment font-content"><div style="position: relative; overflow: hidden;"><div class=content><div><span style="font-size: medium">&nbsp; 第一行一个数n。</span></div>
<div><span style="font-size: medium">&nbsp; 接下来每行一个数a[i]。</span></di