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sort
快速排序法和堆排序法Fortran90程序,其中快速排序法使用到了递归过程,因此对于堆栈要求较高(both Quicksort and Heapsort program are used for sort array. Note that a recursion process is used in Quicksort program, Thus it need require a relative high stack size.)
- 2020-06-29 20:00:01下载
- 积分:1
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PID自动控制电机转速
说明: 利用pid算法控制电机转速,转速可调,数码管显示,初学者实用(Using PID algorithm to control motor speed, adjustable speed, digital display, beginners practical)
- 2020-06-22 16:00:01下载
- 积分:1
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mixfft
fft混合基算法,c代码实现,可移植混合基的傅立叶变换算法(fft-based hybrid algorithm, c code, portable hybrid-based Fourier transform algorithm)
- 2008-07-27 12:35:37下载
- 积分:1
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AFD_MATLAB
AFD(自适应傅立叶变换)的matlab实现代码(the matlab code of AFD algorithm)
- 2017-12-11 16:54:28下载
- 积分:1
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DStheory
DS证据理论的matlab实现,是数据挖掘的重要理论,可实现故障诊断。(Matlab implementation of DS evidence theory, data mining is an important theory, fault diagnosis can be achieved.)
- 2011-11-08 15:05:15下载
- 积分:1
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pfm-scource
计算材料学中用相场法模拟凝固相变以及晶粒长大的开源性程序(Computational Materials Science solidification using phase-field simulation of grain growth phase transitions and open-source program)
- 2021-01-28 16:38:34下载
- 积分:1
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1
说明: 3跨每跨35米桥梁响应的车桥耦合程序,使用Fortran编写(3 cross each bridge 35 meters across the bridge coupling procedures to respond)
- 2011-05-19 23:22:47下载
- 积分:1
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NMFLAB
非负矩阵分解在矩阵计算中具有重要意义,这是NMF非负矩阵分解实验室完整代码。(non-negtive resolution)
- 2014-09-26 15:12:00下载
- 积分:1
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registration
point cloud 点云配准计算,通过选择几组匹配的点云数据对对点云数据进行配准处理(point cloud point cloud registration computing, by selecting a set of match point cloud data point cloud data registration process)
- 2016-01-12 11:03:05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