题目大意 给你两个 \(n\) 个整数的排列,第一个排列表示原排列,第二个排列表示第 \(i\) 个数可以和i变成第 \(g_i\) 个数,问,最少对所有数进行几次操作可以使原排列变为有序的排列. 题解 首先,我们可以利用第二个排列建图,易得每一个点只有一个出度,一个入度,所以这幅图只由简单环和自环组成. 我们还可以发现,在环上跑大于环的长度的距离等同于跑两点之间的直线距离,也就是说如果环的长度为 \(cnt_i\) ,两点之间的直线距离为 \(x_i\) ,我们要求的距离为 \(d\) ,那么…

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…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2689 Sort it Problem Description You want to processe a sequence of n distinct integers by swapping two adjacent sequence elements until the sequence is sorted in ascending order. Then how many times it …

Bubble Sort Problem Description   P is a permutation of the integers from 1 to N(index starting from 1).Here is the code of Bubble Sort in C++. for(int i=1;i<=N;++i) for(int j=N,t;j>i;—j) if(P[j-1] > P[j]) t=P[j],P[j]=P[j-1],P[j-1]=t; After the s…

原题连接:https://pta.patest.cn/pta/test/16/exam/4/question/678 题目如下: Given any permutation of the numbers {0, 1, 2,..., N−1N-1N−1}, it is easy to sort them in increasing order. But what if Swap(0, *) is the ONLY operation that is allowed to use? For exam…

B. Batch Sort time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a table consisting of n rows and m columns. Numbers in each row form a permutation of integers from 1 to m. You…

Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending order). The replaceme…

Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending order). The replaceme…

题目链接:https://leetcode.com/submissions/detail/55876321/ 自己的做法,30个测试用例通过了29例,终究还是有一个系列类型的是无法通过的,因为自己妄想在permutation的代码上,通过排序来进行.然而,每一次同第一个元素交换位置之后,进入了递归,此时数组nums并不是有序的!!! 来看看自己的这段代码,谨记教训,然后还是去看看大神们的思路吧! class Solution { public: vector<vector<int>>…

1067. Sort with Swap(0,*) (25)   Given any permutation of the numbers {0, 1, 2,..., N-1}, it is easy to sort them in increasing order. But what if Swap(0, *) is the ONLY operation that is allowed to use? For example, to sort {4, 0, 2, 1, 3} we may ap…