https://111qqz.com/en/tags/factorial-number-system/Recent content in Factorial Number System on 111qqz's blogHugo -- gohugo.ioen© 2015-2026 111qqzWed, 14 Sep 2016 07:05:21 +0000https://111qqz.com/en/post/acm-icpc/2016/2016-09-14-codeforces-501-d-misha-and-permutations-summation-e5bab7e68998e5b195e5bc80e5bab7e68998e98086e5b195e5bc80factorial_number_systeme7babfe6aeb5e6a091x2/Wed, 14 Sep 2016 07:05:21 +0000https://111qqz.com/en/post/acm-icpc/2016/2016-09-14-codeforces-501-d-misha-and-permutations-summation-e5bab7e68998e5b195e5bc80e5bab7e68998e98086e5b195e5bc80factorial_number_systeme7babfe6aeb5e6a091x2/<p><a href="http://codeforces.com/problemset/problem/501/D" target="_blank" rel="noreferrer">题目链接</a></p> <p>题意：给出两个排列，定义ord(p)为排列p的顺序（字典顺从小到大），定义perm(x)为顺序为x的排列，现在要求<figure><img class="my-0 rounded-md" loading="lazy" decoding="async" fetchpriority="low" alt="" src="http://codeforces.com/predownloaded/46/04/46046198f19147fb9f021abaacf5458998990830.png" ></figure>  1 ≤ <em>n</em> ≤ 200 000</p>