c语言一维数组怎么快速排列
309
2022-08-31
Codeforces 844 C. Sorting by Subsequences (循环节)
Description
You are given a sequence a1, a2, …, an consisting of different integers. It is required to split this sequence into the maximum number of subsequences such that after sorting integers in each of them in increasing order, the total sequence also will be sorted in increasing order.Sorting integers in a subsequence is a process such that the numbers included in a subsequence are ordered in increasing order, and the numbers which are not included in a subsequence don’t change their places.Every element of the sequence must appear in exactly one subsequence.
Input
The first line of input data contains integer n (1 ≤ n ≤ 10^5) — the length of the sequence.The second line of input data contains n different integers a1, a2, …, an ( - 10^9 ≤ ai ≤ 10^9) — the elements of the sequence. It is guaranteed that all elements of the sequence are distinct.
Output
In the first line print the maximum number of subsequences k, which the original sequence can be split into while fulfilling the requirements.In the next k lines print the description of subsequences in the following format: the number of elements in subsequence ci (0 < ci ≤ n), then ci integers l1, l2, …, lci (1 ≤ lj ≤ n) — indices of these elements in the original sequence.Indices could be printed in any order. Every index from 1 to n must appear in output exactly once.If there are several possible answers, print any of them.
Examples input
63 2 1 6 5 4
Examples output
42 1 31 22 4 61 5
题意
找出原序列的最大子序列个数,满足每个子序列内部排序以后可以使得原序列有序。
思路
对原序列每个数字编号,寻找排序以后置换的循环节即可。
AC 代码
#include
版权声明:本文内容由网络用户投稿,版权归原作者所有,本站不拥有其著作权,亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容,请联系我们jiasou666@gmail.com 处理,核实后本网站将在24小时内删除侵权内容。
发表评论
暂时没有评论,来抢沙发吧~