efficient Huffman encoding and decoding, oh, good efficiency

部分数值算法的c＋＋实现，对于某些网友应该非常有用-part of the numerical algorithm c++, for some netizens should be very useful

基于混合基算法的快速傅立叶变换和反变换在VDSL2中的应用与实现-Mixed-radix FFT-based fast Fourier transform and inverse transform in the application and implementation of VDSL2

简单的稳定匹配算法实现，无bug Implement Gale-Shapley algorithm of the Stable Matching Problem in your favorite language, and give the matching result of attached ranking data (boys rankings.txt and girls rankings.txt), supposing that the ranking is sorted from high to low. (C++ source file gs make ranking.cc which generates the data is also supplied here.)  

矩阵求逆 矩阵求逆 矩阵求逆 -matrix inversion

原题：编写一个子程序NewTon（float x0，float eps，float x1）。它的功能是用牛顿迭代法求f（x）=x*x*x-2x*x+4x+1在x=0附近的一个实根。若迭代成功，则返回费0值；否则，返回0。-original title : the preparation of a subroutine NewTon (x0 float, float eps, float x1). Its function is to use Newton"s iterative method for f (x) = x* x* x-2x 4x* x 1 x = 0 in the vicinity of a real roots. If successful iteration, the returned value fees 0; Otherwise, the return 0.

在许多情况下我们需要穷举组合的算法，比如密码词典。这个算法的关键是密码下标进位的问题。另外本例子中的写文件语句效率比较低，为了降低算法复杂度没有优化。如果要提高写文件的效率，可以使用缓冲区，分批写入。-in many cases we need exhaustive combination of algorithms such as password dictionary. The algorithm is the key indices into password-issue. Another example of this document written statement low efficiency, in order to reduce the complexity of the algorithm has not been optimized. If the document was to improve the efficiency, the use of buffer zones, into batches.

这是一个小的程序在 NS2 中为简单广播数据包从服务器到客户端的无线介质中

计算pi的最新版源程序-calculated pi to the latest version of the source

加速迭代求方程根的一个实例-accelerate iterative equation for the one-examples

给定n个权值作为n的叶子结点，构造一棵二叉树，若带权路径长度达到最小，称这样的二叉树为最优二叉树，也称为哈夫曼树(Huffman tree)。哈夫曼树是带权路径长度最短的树，权值较大的结点离根较近。该代码实现了哈夫曼树，供大家参考学习。