Let's define the permutation of length n as an array p = [p1, p2, ..., pn] consisting of n distinct integers from range from 1 to n. We say that this permutation maps value 1 into the value p1, value 2 into the value p2 and so on. Kyota Ootori has ju…

B. Kyoya and Permutation Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/553/problem/B Description Let's define the permutation of length n as an array p = [p1, p2, ..., pn] consisting of n distinct integers from range from…

Kyoya and Permutation 这题想了好久才写出来,没看题解写出来的感觉真的好爽啊!!! 题目大意:题意我看了好久才懂,就是给你一个序列,比如[4, 1, 6, 2, 5, 3],第一个数字 的值是4,那么我们找下标为4的数( 跟链表差不多意思 ),然后一直找到底,这些数分为一类, 如[4, 1, 6, 2, 5, 3] 就可以分为三类,[4, 2, 1] , [6, 3],[5],这三类,然后每个类里面按从大 往小排,然后类之间按字典序排,[4, 1, 6, 2, 5, 3] 重…

题目链接: B. Kyoya and Permutation time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Let's define the permutation of length n as an array p = [p1, p2, ..., pn] consisting of n distinct integers…

problem 题意 本题题意不太easy看懂. 给定一个序列,我们能够把这个序列变成一些循环置换的和.然而这样的置换的方法是不止一种的.我们定义一种standard cyclic representation,即每一个循环置换中最大的数都在第一个.把得到的循环置换的括号去掉.我们能够得到一个新的序列. 定义一个序列,使得它变成置换后再去掉括号得到的新序列和原序列同样,那么称这样的序列是稳定的.给定一个n(序列长度)和k.要求求出全部稳定序列按字典序排序后的第k大序列. 思路 首先我们能够证明.…

嘛,一直以来蒟蒻都没怎么打过CF……现在还是蓝名狗……今天跟着zyf打了一场virtual,果断一题滚粗…

A. Kyoya and Colored Balls 大意: 给定$k$种颜色的球, 第$i$种颜色有$c_i$个, 一个合法的排列方案满足最后一个第$i$种球的下一个球为第$i+1$种球, 求合法方案数. 简单组合, 添加第$i$种时必须在最后放一个$i$, 剩余任意放, 可重组合算下贡献即可. #include <iostream> #include <cstdio> #define REP(i,a,n) for(int i=a;i<=n;++i) #define PER…

The set [1,2,3,-,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order,We get the following sequence (ie, for n = 3): "123" "132" "213" "231" "312" "3…

Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form. For example: Given s = "aabb", return ["abba", "baab"]. Given s = "a…

Given a string, determine if a permutation of the string could form a palindrome. For example,"code" -> False, "aab" -> True, "carerac" -> True. Hint: Consider the palindromes of odd vs even length. What difference d…