iv class=content><div style="text-indent: 21pt; line-height: 120%"><span style="font-size: medium"><span style="color: #200000; line-height: 120%">第一行两个整数</span><span style="color: #200000; line-height: 120%">n</span><span style="color: #200000; line-height: 120%">，</span><span style="color: #200000; line-height: 120%">k</span><span style="color: #200000; line-height: 120%">。</span></span></div>
<div style="text-indent: 21pt; line-height: 120%"><span style="font-size: medium"><span style=