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wangf
王勖成《有限单元法》里面的教学源程序,PROGRAM OF PLANE PROBLEM 96.1(Wang Aimin, "Finite Element Method," in which the source of teaching, PROGRAM OF PLANE PROBLEM 96.1)
- 2021-01-03 18:38:55下载
- 积分:1
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copula
说明: Copula and tail dependence
- 2020-07-16 23:18:49下载
- 积分:1
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Boundary-Element-Methods
弹性力学问题的边界元—姜弘道,用fortran语言编写的,实例详细(BEM elasticity problems- Jiang Hongdao with fortran language, detailed examples)
- 2020-06-30 06:00:02下载
- 积分:1
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11087 统计逆序对
说明: Description
设a[0…n-1]是一个包含n个数的数组,若在ia[j],则称(i, j)为a数组的一个逆序对(inversion)。
比如 有5个逆序对。请采用类似“合并排序算法”的分治思路以O(nlogn)的效率来实现逆序对的统计。
一个n个元素序列的逆序对个数由三部分构成:
(1)它的左半部分逆序对的个数,(2)加上右半部分逆序对的个数,(3)再加上左半部分元素大于右半部分元素的数量。
其中前两部分(1)和(2)由递归来实现。要保证算法最后效率O(nlogn),第三部分(3)应该如何实现?
此题请勿采用O(n^2)的简单枚举算法来实现。
并思考如下问题:
(1)怎样的数组含有最多的逆序对?最多的又是多少个呢?
(2)插入排序的运行时间和数组中逆序对的个数有关系吗?什么关系?
输入格式
第一行:n,表示接下来要输入n个元素,n不超过10000。
第二行:n个元素序列。
输出格式
逆序对的个数。
输入样例
5
2 3 8 6 1
输出样例
5(Set a[0... N-1] is a n array containing n numbers. If there is a [i] > a [j] i n the case of I < j, then (i, j) is a n inversion pair of a array.
For example, has five reverse pairs. Please use the idea of "merge sorting algorithm" to achieve the statistics of inverse pairs with O (nlogn) efficiency.
The number of inverse pairs of a sequence of n elements consists of three parts:
(1) The number of reverse pairs in the left half, (2) the number of reverse pairs in the right half, (3) the number of elements in the left half is greater than that in the right half.
The first two parts (1) and (2) are implemented by recursion. To ensure the final efficiency of the algorithm O (nlogn), how should the third part (3) be implemented?
Do not use O (n ^ 2) simple enumeration algorithm to solve this problem.)
- 2019-01-07 23:52:06下载
- 积分:1
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Matrix
采用随机数产生2到10阶的随机矩阵,并实现了矩阵的相关运算,比如:加减,乘除,求逆,求行列式(Using random Numbers generated random matrix from 2 to 10 order , and achieving relative to the implementation of the matrix operations, such as: add and subtract, multiple and divided, inverse and determinant)
- 2013-07-17 06:40:04下载
- 积分:1
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chirped_grating_analytical_solution
仿真啁啾光栅投射及反射特性。建构于解析解的基础之上。(Properties of chirped fiber grating)
- 2011-10-15 11:21:54下载
- 积分:1
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vf-udf
膜渗透 FUENT UDF 气液两相流 (Gas-liquid two-phase flow membrane permeation FUENT UDF)
- 2020-12-01 16:09:26下载
- 积分:1
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MATLAB-CODE
系统辨识与自适应Matlab仿真程序 庞中华,崔红 编著(Matlab CODE)
- 2013-07-18 16:49:00下载
- 积分:1
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Fr_bin2dec
converts binary sequence to decimal sequence
- 2013-09-06 18:40:37下载
- 积分:1
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PCG
% SSOR预处理的共轭梯度法求解方程Ax=b
% 输入参数说明
% A 正定矩阵[n*n]
% b 右边向量
% omega SSOR预处理参数(0--2)
% Times 迭代次数
% errtol 给定误差终止条件
%
%输出参数
% NewX 方程Ax=b的x近似解
% avgerr 求解的当前平均绝对误差( SSOR preconditioning conjugate gradient method for solving equations Ax = b the input parameter descriptions A positive definite matrix [n* n] b right side vector omega SSOR preconditioning parameters (0- 2) Times iterations errtol termination of a given error condition NewX output parameter equation Ax = b of x approximate solution to solve the current avgerr average absolute error)
- 2007-11-16 01:14:24下载
- 积分:1