https://111qqz.com/en/tags/%E7%BD%AE%E6%8D%A2%E7%BE%A4/Recent content in 置换群 on 111qqz's blogHugo -- gohugo.ioen© 2015-2026 111qqzWed, 01 Nov 2017 06:47:11 +0000https://111qqz.com/en/post/acm-icpc/2017/2017-11-01-hdu-6038/Wed, 01 Nov 2017 06:47:11 +0000https://111qqz.com/en/post/acm-icpc/2017/2017-11-01-hdu-6038/<p><a href="http://acm.hdu.edu.cn/showproblem.php?pid=6038" target="_blank" rel="noreferrer">http://acm.hdu.edu.cn/showproblem.php?pid=6038</a></p> <h1 class="relative group">题意： <div id="题意" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%e9%a2%98%e6%84%8f" aria-label="Anchor">#</a> </span> </h1> <p>给出两个序列 a 和 b ，求满足  f[i]= b_{f[a[i]]} 的函数个数。</p>