题目大意 给你n个二元组 问你有几种排列是的按两个关键字中的任意一个都不是不降排列的 分析 不妨容斥 我们先加上总的方案数$n!$ 之后我们按第一个关键字排序 因为值相同的情况下不影响答案 所以让总方案数减去$\prod sum_{ai}!$即可 对于第二关键字的情况同上 我们再使序列同时按照第一关键字和第二关键字排序 然后总方案数加上$\prod sum_{(ai,bi)}!$即可 代码 #include<iostream> #include<cstdio> #include&l…

Number Of Permutations 思路:利用容斥,首先所有可能的排列肯定是fac[n],然后可能会有三种 bad 的情况: ①第一个元素的排列是非递减 ②第二种是第二个元素的排列是非递减 ③这两个可能出现的重叠情况,意思就是说同时导致①②成立 这个时候我们利用容斥的思想,用fac[n]-①-②+③即可 我们把所有的pair按照第一个元素优先排列的方式把所有的pair sort 一下( sort 对pair的排序方式是默认第一个元素优先的),这个时候我们就保证了所有pair的第一个元素…

D. Number Of Permutations time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a sequence of nn pairs of integers: (a1,b1),(a2,b2),…,(an,bn)(a1,b1),(a2,b2),…,(an,bn). This sequenc…

题意:https://codeforc.es/contest/1207/problem/D n个元素,每个元素有a.b两个属性,问你n个元素的a序列和b序列有多少种排序方法使他们不同时非递减(不同时good). 思路: 真难则反+容斥,反向考虑,ans1=如果a序列非递减则有a中各个数字出现次数的阶乘的乘积个,ans2=b序列也是一样. ans3=然后还要减去a序列和b序列都是good的方案数,就是元素相同的出现次数阶乘的乘积(注意,如果不存在双good就不算ans3). ANS就是:全排列 -…

挺水的一道题~ 拿全排列随便乘一下就好了. #include <cstdio> #include <algorithm> #define N 300004 #define ll long long #define mod 998244353 #define setIO(s) freopen(s".in","r",stdin) using namespace std; struct Node { int a,b; }t[N]; ll fac[N…

C. Iahub and Permutations time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Iahub is so happy about inventing bubble sort graphs that he's staying all day long at the office and writing permu…

Problem Description The signature of a permutation is a string that is computed as follows: for each pair of consecutive elements of the permutation, write down the letter 'I' (increasing) if the second element is greater than the first one, otherwis…

转载请注明出处: http://www.cnblogs.com/fraud/          ——by fraud Iahub and Permutations Iahub is so happy about inventing bubble sort graphs that he's staying all day long at the office and writing permutations. Iahubina is angry that she is no more import…

Number String Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1016    Accepted Submission(s): 440 Problem Description The signature of a permutation is a string that is computed as follows: fo…

Number String Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1027 Accepted Submission(s): 448 Problem Description The signature of a permutation is a string that is computed as follows: for each…

Given an array A of non-negative integers, the array is squareful if for every pair of adjacent elements, their sum is a perfect square. Return the number of permutations of A that are squareful.  Two permutations A1 and A2 differ if and only if ther…

Permutation p is an ordered set of integers p1,  p2,  ...,  pn, consisting of n distinct positive integers, each of them doesn't exceed n. We'll denote the i-th element of permutation p as pi. We'll call number n the size or the length of permutation…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=4055 Number String Time Limit: 10000/5000 MS (Java/Others)Memory Limit: 32768/32768 K (Java/Others) 问题描述 The signature of a permutation is a string that is computed as follows: for each pair of consecut…

Number String http://acm.hdu.edu.cn/showproblem.php?pid=4055 Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Problem Description The signature of a permutation is a string that is computed as follows: for each pai…

Find the Permutations Sorting is one of the most used operations in real life, where Computer Science comes into act. It is well-known that the lower bound of swap based sorting is nlog(n). It means that the best possible sorting algorithm will take…

Number String Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1935    Accepted Submission(s): 931 Problem Description The signature of a permutation is a string that is computed as follows: for…

C. Iahub and Permutations time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Iahub is so happy about inventing bubble sort graphs that he's staying all day long at the office and writing permu…

题目链接:http://codeforces.com/contest/340/problem/E E. Iahub and Permutations time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Iahub is so happy about inventing bubble sort graphs that he's sta…

Sorting is one of the most usedoperations in real life, where Computer Science comes into act. It iswell-known that the lower bound of swap based sorting is nlog(n).It means that the best possible sorting algorithm will take at least W(nlog(n))swaps…

                           Find the Permutations Sorting is one of the most used operations in real life, where Computer Science comes into act. It iswell-known that the lower bound of swap based sorting is nlog(n). It means that the best possiblesor…

题目如下: Given an array A of non-negative integers, the array is squareful if for every pair of adjacent elements, their sum is a perfect square. Return the number of permutations of A that are squareful.  Two permutations A1 and A2 differ if and only i…

Given an array A of non-negative integers, the array is squareful if for every pair of adjacent elements, their sum is a perfect square. Return the number of permutations of A that are squareful.  Two permutations A1 and A2 differ if and only if ther…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 回溯法 日期 题目地址:https://leetcode.com/problems/number-of-squareful-arrays/ 题目描述 Given an array A of non-negative integers, the array is squareful if for every pair of adjacent eleme…

samtools的说明文档:http://samtools.sourceforge.net/samtools.shtmlsamtools是一个用于操作sam和bam文件的工具合集.包含有许多命令.以下是常用命令的介绍 1. view view命令的主要功能是:将sam文件转换成bam文件:然后对bam文件进行各种操作,比如数据的排序(不属于本命令的功能)和提取(这些操作 是对bam文件进行的,因而当输入为sam文件的时候,不能进行该操作):最后将排序或提取得到的数据输出为bam或sam(默认的)…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2274 Magic WisKey Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 568    Accepted Submission(s): 323 Problem Description On New Year Festival, Liu…

总体感觉这次出的题偏数学,数学若菜表示果断被虐.不过看起来由于大家都被虐我2题居然排到331,rating又升了74.Div2-AA. The Walltime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputIahub and his friend Floyd have started painting a wall. Iahub is paintin…

Random - Generate pseudo-random numbers Source code: Lib/random.py This module implements pseudo-random number generators for various distributions. For integers, uniform selection from a range. For sequences, uniform selection of a random element, a…

转自:samtools常用命令详解 samtools的说明文档:http://samtools.sourceforge.net/samtools.shtml samtools是一个用于操作sam和bam文件的工具合集.包含有许多命令.以下是常用命令的介绍 1. view view命令的主要功能是:将sam文件转换成bam文件:然后对bam文件进行各种操作,比如数据的排序(不属于本命令的功能)和提取(这些操作是对bam文件进行的,因而当输入为sam文件的时候,不能进行该操作):最后将排序或提取得到…

Maximum Score Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=83008#problem/J Description Ron likes to play with integers. Recently he is interested in a game where some integers are given and he is…

As an example of subclassing, the random module provides the WichmannHill class that implements an alternative generator in pure Python. The class provides a backward compatible way to reproduce results from earlier versions of Python, which used the…