hash compressor

PHP, Apache, Perl, and bsddb all use time33 hash. Simplest version Uint32_t time33 (char const * STR, int Len) This version is simple enough to reflect the algorithm idea of time33. Replace a multiplication operation with a bitwise operation.Unsigned long time33 (char const * STR, int Len) 59 characters 1000 0000 run (GCC does not enable optimization, because the actual code of the two functions will be the same after optimization) First: Real 0m4. 38

[ThinkingInJava] 51. Hash and hash code, thinkinginjava51 /*** Book: Thinking In Java * function: hash and hash code * file: Groundhog. java * Time: May 3, 2015 09:42:54 * Author: cutter_point */package Lesson17Containers; public class Groundhog {protected int number; // protection type. After inheritance, the protecti

Cause of the problem:At least there is special circumstances for which this unreliability kicks in.Comparing [a hash] and [b hash] of different nsstring is safe when: The strings ' length is shorter or equal to characters. [a length] is different to [b length]. The concatinated first, middle, and last from characters of a differ to the concatinated components of b. Otherwise every diff

IOS: [NSString hash] the same hash value problem occurs. Cause: At least there are special circumstances for which this unreliability kicks in. Comparing [a hash] and [B hash] of two different NSString is safe when: The strings 'length is shorter or equal to 96 characters. [A length] is different to [B length]. Th

Two probes are a common means of avoiding hash collisions, and the idea is:Insert:Find hash Location (serch)-If you do not conflict, insert, the conflict will be the first probe1th Time Detection:Insert the hash position into the original hash position plus the offset of the 1*1........Detection of the first I:Insert t

The length and performance test examples of various hash algorithms implemented by PHP, And the hash performance test This article describes the length and performance tests of various hash algorithms implemented by PHP. We will share this with you for your reference. The details are as follows: The Hash result is as f

mutable Types of data are not hashed , such as List, Dictionary: Same value different address, different value same address list, dictionary variable,values, letters, strings, numbers, tuples immutable: Same value same address, different value different addressHow to determine the variable immutable? Summary: Change the value to see if the ID is the same, the same as the ID variable, it is not hashed,The value is changed, the ID is changed, or it is immutable, it can be hashedHash Concept:Hash

#pragma once#include using namespace Std;Enum status//represents the state of the current position{EXITS,DELETE,EMPTY,};Templatestruct KEYVALUENODE//KV Key-value pairs{K _key;V _value;Keyvaluenode (const k key=k (), const v VALUE=V ()): _key (Key), _value (value){}};Static size_t Bkdrhash (const char * str)//hash algorithm{unsigned int seed = 131; 31 131 1313) 13131 131313unsigned int hash = 0;while (*STR){

Example of consistent HASH algorithm implemented by PHP and consistent hash Algorithm This article describes the consistent HASH algorithm implemented by PHP. We will share this with you for your reference. The details are as follows: Running result: Asofiwjamfdalksjfkasasdflasfja ing region to node region ing to node node_1iowanfasijfmasdnfoas ing to node node_

Java Collection (ii)-hash and hash codesThe Hashcode () method of object generates a hash code, which by default uses the object's address calculation hash code. therefore, in using hashed data structures (Hashset,hashmap,linkedhashmap and likedhashset), you must overwrite the hashcode () and Equals () methods for your

Hashing algorithmHashing algorithm: Hash algorithm is not a specific algorithm but a class of algorithms collectively, as long as the completion of this function is a hashing algorithm, hashing algorithm is also called hash algorithm. At the same time, the process is irreversible and cannot be inferred from key data. Judging whether a hashing algorithm is excellent, it is evaluated according to the algorith

Everybody help. ~hash

"error:exist";3 If the old account landing successful, then output "Login:ok";4 If the old account QQ number does not exist, then output "Error:not Exist";5 If the old account password is wrong, then output "Error:wrong PW". Input Sample: 5 L 1234567890 myQQ@qq.com n 1234567890 myQQ@qq.com n 1234567890 myQQ@qq.com L 1234567890 myqq@qq L 1234567890 myQQ@qq.com Output Sample: Error:not Exist new:ok error:exist error:wrong PW Thought analysis: Examination hashing. Chain separation method, bec

The hash function in the tutorial number is generally used to obtain the remainder of the modulus. The modulus is generally the length of the hash table (number of buckets), which is usually used for better hashing, the module is also adjusted to a prime number. What is the hash function in the kernel? Take the hash fu

(), you can call the Zend_hash_next_free_element () function to obtain:ulong NextID = zend_hash_next_free_element (HT); sizeof (data), NULL);Hashtable adding update elements:After initializing the Hashtable, you can use Zend_hash_add to add elements to the Hashtable, Zend_hash_add is a macro:#define Zend_hash_add (HT, Arkey, Nkeylength, PData, ndatasize, pDest) \ _zend_hash_add_or_update (HT, Arkey, Nkeylength, PData, Ndatasize, PDest, Hash_add zend_file_line_cc)Let's take a look at th

Python generates a hash hash--hashlib module1) Generate hash and save in local(1) Code[Python] View plain copyImport HashlibImport shelve#原密码paw ={"Water": "123456", "root": "Admin123"}#生成hashM1 = HASHLIB.MD5 ("123456". Encode ("Utf-8"))M2 = hashlib.md5 ("admin123". Encode ("Utf-8"))H1 = M1.hexdigest ()H2 = M2.hexdigest ()Print (H1)Print (H2)#现在利用shelve保存账号和密码信息到

Redis Hash is a string-type field and value mapping table, and hash is particularly useful for storing objects. Each hash in a Redis can store 2^32-1 key-value pairs (more than 4 billion). Example 127.0.0.1:6379> hmset runoobkey name "Redis Tutorial" description "Redis basic commands for caching" likes visit ORS 23000 OK 127.0.0.1:6379> hgetall runoobkey 1

The following is the implementation of the hash table, inserting and printing code: #include Here is the test code: Main.cppvoid Main () {hash_table ht; Elemtype ar[] = {0,7,14,21,28,59,35,42,5,9,3,6,13,52,64}; Test array init_hash_table (HT); Initialize the hash table for (int i = 0; i Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Java encryption algorithm-MD5 encryption and Hash hash encryption algorithm source code, encryption algorithm-md5 Package com. ompa. common. utils; Import java. security. MessageDigest;Import java. security. NoSuchAlgorithmException; Import javax. crypto. Mac;Import javax. crypto. SecretKey;Import javax. crypto. spec. SecretKeySpec; /*** MD5 Encryption** @ Author zhangcd* @ Date 2016-4-29*/Public class Encr

LA 4513 (Stammering Aliens-Hash for LCP) [Template: hash for LCP], 4513lcp 4513-Stammering AliensDr. ellie Arroway has established contact with an extraterrestrial civilization. however, all efforts to decode their messages have failed so far because, as luck wowould have it, they have stumbled upon a race of stuttering aliens! Her team has found out that, in every long enough message, the most important wo