luhn algorithm

In large data high concurrent access, there is often a service or interface in the face of the explosion of the request is not available, or even triggered a chain reaction caused the entire system crashes. At this point you need to use one of the technical means to limit the flow, when the request reached a certain number of concurrent or rate, it is waiting, queuing, demotion, denial of service and so on. In the current limit, the two common algorithms are leaky bucket and token bucket

1. Overview The sorting algorithm is the most basic algorithm in the computer technology, and many complex algorithms use the sort. Although all sorts of sorting algorithms have been encapsulated into library functions for programmers to use, it is important to understand the idea and principle of sorting algorithm for writing high quality software. This paper

1. Complexity of TimeThe time complexity of the algorithm is the basic method to measure the efficiency of an algorithm. While reading other algorithmic tutorials, the time-complexity of the algorithm is somewhat jerky and difficult to understand. It is not possible to measure the algorithm well in practical applicatio

Reprint please add:http://www.cnblogs.com/courtier/p/4273193.html Before starting this article, the nagging words: 1: First, before reading this article, you should at least understand, what is the finite state machine, what is the KMP algorithm, because, this article is from the source of KMP, finite stateMachine, because, KMP is the DFA (deterministic finite automaton) on the simplification.2: Many KMP articles (limited automata

The general minimum spanning tree algorithm is divided into two kinds of algorithms:One is the Kruskal algorithm: the idea of this algorithm is to use the idea of greed, the weight of each side of the first order, and then each time to select the current minimum edge, to determine whether this side of the point has been selected, that is already in the tree, is g

Algorithm Definition 　　An algorithm (algorithm) is an accurate and complete description of a solution and a series of clear instructions for solving problems.The algorithm represents a system method to describe the problem-solving policy mechanism. That is to say, the required output can be obtained for certain standar

[Java]Package Ceshi;Public class biSearch {/*** @ Param args*//*Semi-query-when the table is an ordered table, you can use semi-query;Basic Idea: in an ordered table, take the intermediate element as the comparison object. If the given value K is the same as the intermediate record keyword, the search is successful;If the given value K is less than the keyword of the intermediate record, continue searching in the left half of the table;If the given value K is greater than the keyword of the inte

The last article talked about the quick sort, this article mainly talks about heap sort 2.5, heap sort algorithm 1, what is the heapThe heap is a tree structure, more accurately a complete binary tree. And the data for each non-leaf node is greater than or equal to (less than or equal to) its left and right child nodes, so that the root node of the heap structure is the maximum (minimum), and the heap is called the maximum heap (the smallest heap). So

OutputFor each case, output a single integer and the maximum rate at which water may emptied from the pond. Sample Input5 41 2 401 4 202 4 202 3 303 4 10 Sample Output50 Template problem, to understand the reverse side of the addition (to provide the opportunity to regret)Reference Blog: http://www.cnblogs.com/zsboy/archive/2013/01/27/2878810.html EK algorithm:Each augmentation is through the BFS, through Dfs can only find a routeAnd Dinic Dfs is looking for a number of routes, relatively fast

SPFA Algorithm definition Inventor: Dengfanding Time: 1994 Time complexity O (e) Principle: A FIFO queue, an array d that holds the shortest distance. When initializing: There is only one source point in the queue. That is, the starting point itself. The value in D is the maximum value except that the starting point has its own distance of 0. Queue={v0},d={0,max,max,max...max}, then the VO is taken out of the value of Max at the distance from the J

Insert Sort Algorithm definition Insert Sort: Inserts a new data into an ordered array and continues to be ordered. For example, there is an unordered array of length n, which can be sorted by N-1 the first time, the 1th number of the array is considered an ordered array, the second element of the array is inserted into only 1 ordered arrays, and the second, the first two elements of the array make up an ordered array, Inserts the third element of t

of: {11,9,10,5,8,2,6,4,3,1,7} Heap Sort definition Heap ordering (heapsort) refers to a sort algorithm designed using the data structure of the heap. A heap is a structure that approximates a complete binary tree and satisfies the properties of the heap at the same time: that is, the key value or index of the child node is always less than (or greater than) its parent node. The average time complexity for heap sorting is 0 (NLOGN). Steps 1. Create

One, knapsack problem description:There are n items and a backpack with a weight of M, the weight of the article I is w[i], the value is p[i]. The solution of which items are loaded into the backpack allows the sum of the costs of these items to be no more than the backpack weight and the maximum value.Second, the solution:1, greedy algorithm: Greedy algorithm based on the idea is that every choice is the b

A * algorithm is a heuristic search algorithm. People who understand BFS, DFS, or Dijkstra algorithms should know that. These algorithms are a way of blindly searching around. Heuristic Search: Heuristic search is the search in the state space to evaluate the location of each search, get the best location, and then from this location to search until the target. This can omit a lot of fearless search path,

Pattern matching algorithm for strings The locating operation of a substring is often called a pattern match of a string, where T is called a pattern string . General positioning function for substring position (Brute force)That's what I write Java code for.int Index(String s,string T,int POS) {char[] S_arr = S.tochararray (); char[] T_arr = T.tochararray ();intI,j,k;//iIs the pointer to the main string s, and J is the pointer to the pat

Chapter of Basic Statement This poster of algorithms are based on the book and the lecture of algorithms on Coursera which are taught by Robert Sedgewi CK and Kevin Wayne, writers of the book mentioned above. Chapter of "algorithm" is the fundamental of Java programming language and a brief introduction to Algorithms and DA TA structure, including their concepts. Some interesting problems and the basic implementations of them. Introduction Why We s

Dijkstra algorithm Also known as Dijkstra algorithm, is a classical shortest path algorithm, the main feature is to expand from the starting point to the outer layer, until the extension to the end point, the use of breadth-first search to solve the problem of the single source shortest path of the weighted direction graph, the