quantopian algorithms

These two algorithms are put together because they are used to solve the problem of the optimal solution, and the greedy algorithm is different. But there are some differences between the two algorithms, which are explained below:Divide, divide and conquer, divide a complex problem into two or more identical or similar sub-problems, then divide the problem into smaller sub-problems ... Until the last sub-pr

I. BackgroundIn the preparation of the soft test, met the algorithm, listen to the experience, algorithm research good is very simple, the study is not very difficult, so think about the algorithm to do a summary, because the algorithm is not only in the big problem occupies 15 points, but also in the choice of problems will appear, especially the test complexity and the application of various algorithms,Greed (short-sighted): Like looking for a boyfr

1. Tag-Clear Algorithm Mark Clear algorithm is the most basic collection algorithm , other collection algorithms are based on this idea. The markup cleanup algorithm is divided into "tags" and " Clear the two stages: first mark the objects that need to be recycled, and then unify the clears the object. Its main disadvantage:①. The marking and purging process is inefficient. ②. After the mark is cleared, a large amount of discontinuous memory

, and at garbage collection, copy the surviving objects in the memory being used into the unused block of memory, then clear all objects in the memory block in use, swap the two memory roles, and complete the garbage collection.The biggest problem with the replication algorithm is:Wasted Space We integrate the idea of tag cleanup to implement (generational GC algorithm):In the S0/s1 area, each copy of the collection will give you age plus one. When it reaches a certain age, it is considered an o

efficient than insert sorting, when the amount of data is less, insert sort is more efficient*/functionswap (arr, index1, index2) {vartemp =ARR[INDEX1]; ARR[INDEX1]=Arr[index2]; ARR[INDEX2]=temp;}functionShellsort (arr) {varN =arr.length; varH = 1; Console.time (' Hill sort time-consuming '); while(H ) {h= 4 * H + 1; } while(H >= 1) { for(vari = h; i ){ for(varj = i; J >= H Arr[j] h) {Swap (arr, J, J-h); }} H= (h-1)/4;} console.timeend (' Hill sort time-consuming

Comparison of recursive and non-recursive algorithms for depth-first search in Maze addressingQiao is clumsy (welcome reprint, but please specify Source: Http://blog.csdn.net/qiaoruozhuo )This paper only explores the comparison of recursive and non-recursive algorithms for depth-first search in maze addressing, and other related codes are described in the maze problem (clumsy) http://blog.csdn.net/qiaoruozh

: Network Disk DownloadIntroduction to algorithms the third edition of the Chinese version of the clear PDF, the book a total of 8 sections 35 chapters, covering the basic knowledge, sequencing and sequencing statistics, data structure, advanced design and analysis technology, advanced data structure, graph algorithms, algorithm issues selected, and mathematical basics. A very practical handbook of referenc

Symmetric encryption algorithm (with the same decryption key) name Key Length Operation Speed Security Resource Consumption Des 56 Guests More quickly Low In 3DES 112-bit or 168-bit Slow In High Aes 128, 192, 256-bit Fast High Low asymmetric algorithm (encryption key and decryption key differ) name Maturity Level

you repeat the pattern, you must find the tail from scratch. Delete: A specific data item cannot be deleted until it is found (either the data item is replaced or becomes empty). The deletion algorithm assumes that no holes are allowed (there are non-empty data items behind one or more empty cells), and if the deletion algorithm allows holes, the other algorithms become complex because the non-airborne inefficiencies are judged. Therefore, non-em

Lift sorting algorithm I believe that everyone is not unfamiliar, perhaps many people have memorized them, and even can write it at any time. Yes, these are the most basic algorithms. Here is a summary of the various internal sorting algorithms, including insertion sort (direct insertion sort, binary insertion sort, hill sort), exchange sort (bubble sort, quick sort), select sort (Simple select sort, heap s

The following is a simple list of some common JavaScript algorithms, need friends can do a reference. Of course, these algorithms apply not only to JavaScript, but also to other languages. A. Linear search: Simpler, entry-level algorithms A is an array, x is the value to search for function Linearsearch (A, x) {for (var index = 0; index Two. Two p

This article is published in the well-known technical blog "Highly Scalable Blog", by @juliashine for translation contributions. Thanks for the translator's shared spirit. The translator introduces: Juliashine is the year grasps the child engineer, now the work direction is the massive data processing and the analysis, concerns the Hadoop and the NoSQL ecosystem. "MapReduce Patterns, Algorithms, and use Cases" Address: "MapReduce patterns,

Machine learning algorithms are numerous, and various algorithms involve more parameters, this article will briefly introduce the RF,GBDT and other algorithms of tuning experience and steps. 1. BP Tuning matters1.BP is sensitive to feature scaling, first scale data.2. Experience shows that L-bfgs converges faster on small data, and Adam works well on Big data, an

author's "Repudiation", which is called Digital signature application.MD5 is also widely used in encryption and decryption technology, in many operating systems, the user's password is MD5 value (or similar to other algorithms) to save the way, when the user login, the system is the user input password calculated as MD5 value, and then to the system to save the MD5 value to compare, and the system does not " Know "What the user's password is." 2.rsa:

Summaryhave been interested in machine learning, has no time to study, today is just the weekend, have time to see the major technical forum, just see a good machine learning article, here to share to everyone.Machine learning is undoubtedly a hot topic in the field of current data analysis. Many people use machine learning algorithms more or less in their usual work. The IT manager network here summarizes common machine learning

Here are some general basics, but it's still very useful to actually do machine learning. As the key to the application of machine learning on current projects such as recommender systems and DSPs, I think data processing is very important because in many cases, machine learning algorithms are pre-requisites and require data.Machine learning emphasizes three key words: algorithm, experience, and performance, as shown in the process.It is shown that ma

Top 10 Mathematical ModelingAlgorithmMantan Author: JulyJanuary 29, 2011 Reference:I. The top ten greatest algorithms in the 20th century.Ii. Classic Algorithm Research Series in this blogIii. Wikipedia ------------------------------------------ Bloggers:1The top 10 mathematical modeling algorithms are written based on a list on the Internet. This article gives a brief introduction to the top 10 a

heap top *. Remove it (in fact, swap it with the end element of the heap array, at which point the element at the end is the maximum value), and then re-construct the remaining n-1 sequence into a heap. This gives you a secondary value of n elements. So repeated execution, you can get an ordered sequence of *//* time complexity of O (NLOGN), better than bubbling, simple selection, directly inserted O (n^2) *///structure large Top heap # define LEFTCHILD (i) ((i) + 1) void Percdown (int *arr,

Summary of multiple sorting algorithms (not including detailed projections of complexity)Stable sorting and unstable orderingStable ordering: The relative position of the same element in the sort does not change.Unstable sort: The relative position of the same element in the sort is changed.Internal sorting and external sorting:Internal sorting: The sorting process for rows of records and content placed in the computer's random memoryExternal sorting:

packagecom.doctor.java.design_pattern;importorg.slf4j.logger;importorg.slf4j.loggerfactory;/ Several implementations of *** Singleton mode--"Java Development technology-experience the beauty of design patterns and algorithms in architecture" ** @author doctor* * @time 2015 April 24 PM 11:11:03*/publicclasssingletonpattern{/*** @param args*/publicstaticvoidmain (String[]args) { Lazysingleton.getinstance (); Lazysingleton.getinstance (); Lazysingleton