Note: This article is divided into three parts,The first part is a detailed explanation of the top K algorithm of Baidu interview questions; the second part is a detailed description of the hash table algorithm; the third part is to build the
Test the data structure-Part 2: queue, stack, and hash table
Original article:Part 2: The Queue, Stack, and HashtableBenThis article is the second part of the "Data Structure" series. It examines the three most researched data
Primary objective: to find a hash function that supports 64-bit integer computation efficiently, so that the efficiency in speed and space is higher than that of other function functions, and 32-bit integer computation in internal
Let's start with a simple question: Have a huge string array, and then give you a separate string that lets you find out if there's a string from this array and find it, what would you do? There is a way to the simplest, honestly from the tail, a
One, what is Perl Hash
A hash is a data structure, and a similar array, that can be stored in or retrieved from a value. However, unlike arrays, the index is not a number, but a name. That is, the index (here, we call it key) is not a number but an
Hash list hash function definitionThe hash function maps the input to a number. That is, whatever data you give it, it gives you a number.Hash functions must meet some requirementsL It must be consistent . For example, suppose you get 4 when you
# Include # Include # Include # Include # Include # Include
Using namespace STD;
/* Unsigned int bkdrhash (const string Str){Unsigned int seed = 131;Unsigned int hash = 0;String: const_iterator it;Cout For (IT = Str. Begin (); it! = Str. End (); It
Source: Http://www.jianshu.com/p/e8fb89bb3a61 Consistency hash is used for distributed cache system, the key value is mapped to the specific machine IP, and the increase and deletion of 1 machine data movement is small, the impact on the current
Syntax
There are only two ways to create a 'quot.
Create reference
Create Rule 1If you add a '/' sign before a variable, you will get the 'quota' of the variable '.
$ Aref = // @ array; # $ Aref saves the 'quot' pointing to @ Array'$ Href =/% hash;
Basic Scene
For example, you have n cache server (behind the cache), then how to map an object to the n cache, you are likely to use similar to the following common method to compute the hash value of object, and then evenly mapped to n
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