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a
说明: FFT正变换和逆变换,了解FFT变换的实质(FFT transform and inverse transform is to understand the substance of FFT transform)
- 2007-11-27 20:49:06下载
- 积分:1
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自然数的最大公约数
用欧几里得算法求两个自然数的最大公约数通过c语言实现(Using Euclidean Algorithms to Find the Maximum Common Number of Two Natural NumbersRealization by C Language)
- 2019-01-26 14:43:28下载
- 积分:1
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drilled-hole-PBG
xfdtd中用于计算光子晶体PBG的算例(example used for PBG calculation in xfdtd)
- 2011-11-21 23:28:40下载
- 积分:1
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solve_equations
几个使用的解线性方程组的程序,包括高斯消去法,高斯列主元法,高斯——赛德尔消去法。简明实用。(Gauss elimaination, Gauss_seidel ellimination)
- 2013-12-08 17:42:57下载
- 积分:1
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step response
Step response of vehicle
- 2018-04-20 19:56:54下载
- 积分:1
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Euler2Quaternion
欧拉角与四元数 欧拉角与四元数 欧拉角与四元数 欧拉角与四元数 欧拉角与四元数(you you you you you you you you you you you you you you you you my )
- 2014-05-08 21:29:38下载
- 积分:1
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20036127002
反密法在数值计算中的地位就不用我来一一列举了,此程序就可以轻易的使其实现。(anti-secret numerical calculation method in the position I would not have to list them one by one, this procedure can easily achieve it.)
- 2006-11-24 18:26:46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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pianxin
计算偏心圆导热计算以及同位网格上的SIMPLE算法
(Calculating thermal calculations and eccentric position on the grid with SIMPLE algorithm)
- 2013-07-02 21:26:11下载
- 积分:1
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AIA
基于最小二乘法求解相移量算法,最小二乘求相移图相位(phase shift algorithm based on the least squares method, least squares seeking phase shift diagram phase)
- 2013-04-08 18:38:11下载
- 积分:1