Lucky hash quiz system development (source code deployment) fun investment hash game play development (case requirements)

We believe that the meta universe must be a large community with real, social and economic behavior. DPK's star system is a meta universe, which requires only a little bit of construction. Let me talk about our preliminary plan in the meta universe. We have cooperated with a global fan association of large-scale animation. They have built a two-dimensional main city. We will help them realize a VR two-dimensional theme park on a planet.

hash function ： A function that maps the key value of an element in a hash table to the storage location of the element . Hash function is the most important part of hash table . Generally speaking , The hash function will meet the following conditions ：

　　 Hash functions should be easy to compute , And try to make the calculated index values evenly distributed , This reduces hash conflicts

　　 The hash value calculated by the hash function is a fixed length output value

　　 If Hash(key1) It's not equal to Hash(key2), that key1、key2 It must not be equal

　　 If Hash(key1) be equal to Hash(key2), that key1、key2 May be equal , It may not be equal （ Hash collision occurs ）

　　 In the practical application of hash table , The types of keywords are in addition to numeric types , It could also be a string type 、 Floating point type 、 Large integer type , There may even be a combination of several types . Generally, various types of keywords will be converted to integer types first , Then through the hash function , Map it to a hash table . And about the keyword of integer type , The commonly used hash function methods are ： direct addressing 、 Division and remainder 、 Square with the middle method 、 Base conversion 、 Digital analysis 、 Folding method 、 Random number method 、 Product method 、 Point product method, etc .

　　 Various hash algorithms

　　 Using one-way Hash The function provides a message fingerprint , If different messages can generate the same hash value （ Called a collision ）, Then the attacker can break the security mechanism according to the revealed rules .

　　 A high security hash function should generate different hash values for two or more different messages .