-
opimize-code
设计迭代、有限差分法、有限元的matlab优化计算程序(Matlab design iterations, finite difference method, finite element calculation program optimization)
- 2021-04-08 15:59:00下载
- 积分:1
-
db
本程序用在测试采煤机煤矸识别系统中,验证小波算法(Wavelet Algorithm for caving coal)
- 2013-08-10 18:33:01下载
- 积分:1
-
11087 统计逆序对
Description
设a[0…n-1]是一个包含n个数的数组,若在i<j的情况下,有a[i]>a[j],则称(i, j)为a数组的一个逆序对(inversion)。
比如 <2,3,8,6,1> 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, <2,3,8,6,1> 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
-
qczdjl
本程序是用数学方程试计算出一个点在一条线上的垂线坐标,并判断出在线内外,是测量中用的程序!(The test procedure is used to calculate the mathematical equation of a line a point in the vertical coordinate, and determine the line outside, the procedure used to measure!)
- 2011-01-05 17:10:24下载
- 积分:1
-
0带约束的差分进化算法1
基于Python编写的差分进化原理的带边界条件约束算法(A band constraint algorithm based on differential evolution algorithm)
- 2018-07-26 10:10:13下载
- 积分:1
-
jiulie
用于图像处理的独立分量分析,分形维数计算的毯子算法matlab代码,有井曲线作为输入可计算其地震波的衰减。( Independent component analysis for image processing, Fractal dimension calculation algorithm matlab code blankets, There is a well attenuation curve as input to calculate its seismic waves.)
- 2017-02-24 21:00:49下载
- 积分:1
-
4zeyunsuan
复数的四则运算完整版,包括加减乘除,阶乘,开方等。。。(The plural arithmetic full version,, including addition, subtraction, multiplication, and division factorial, prescribing, etc...)
- 2013-10-11 16:41:48下载
- 积分:1
-
Allocation-problem
用计算机编程的方法建立试卷的合理分配问题的优化模型(Optimization model to establish the papers a reasonable allocation problem with computer programming methods)
- 2013-03-14 21:05:15下载
- 积分:1
-
neh
flow shop neh scheduling by makespan minimization
- 2012-03-14 21:59:14下载
- 积分:1
-
CV
说明: 在CV模型下的卡尔曼滤波算法MATLAB程序(CV model in the Kalman filter algorithm MATLAB program)
- 2009-01-14 11:30:00下载
- 积分:1