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A text file to find the top 10 frequently appearing words, but this time the file is longer, said to be hundreds of lines or 1 billion lines, in short, can not read into the memory

Top K Algorithm DetailedApplication Scenarios: The search engine logs all the retrieved strings used by the user each time they are retrieved through a log file, with a length of 1-255 bytes for each query string.Assume that there are currently 10 million records (these query strings have a high degree of repetition, although the total is 10 million, but if you remove the duplicates, no more than 3 million.

Query the top 10 records in Oracle

Label:How does Oracle Query the TOP10 records in a table? SELECT * FROM test where rownum Here is an introduction to RowNum ================================ Use of RowNum and Row_number (), Over () RowNum is a pseudo-column provided by Oracle starting from 8, which is to number the results of SQL, always starting from 1, and the common use is to page out the output. Like what SELECT * from Torderdetail a WHERE ROWNUM This statement is the output of the first

Talk about Webmaster forum and "10 Yuan recharge" the indissoluble bond

As a webmaster, have you ever for the A5 forum "10 Yuan certification" and entanglements? Have you ever had a slow and annoying upgrade for 28 push forums and stragglers forums? Ever because of a "10 yuan recharge" and give up to a forum? Go to today only found that there are always a few webmaster forum and "10 Yuan Recharge" has an indissoluble bond. can landin

Re-learning gdi+[70]: Path Brushes (10)

This example effect chart: Code files:Unit Unit1;InterfaceUsesWindows, Messages, sysutils, variants, Classes, Graphics, Controls, Forms,Dialogs, Comctrls, Stdctrls, Extctrls;TypeTForm1 = Class (Tform)Trackbar1:ttrackbar;Trackbar2:ttrackbar;Trackbar3:ttrackbar;Trackbar4:ttrackbar;Trackbar5:ttrackbar;Trackbar6:ttrackbar;Procedure Formpaint (Sender:tobject);Procedure Formcreate (Sender:tobject);Procedure Trackbar1change (Sender:tobject);Procedure Trackbar2change (Sender:tobject);Procedure Trackb

A number of 10 digits and a single swap and the thought of ...

Today encountered a problem, that is, a >10 and /* AB is the source number, BA is the number of results * * Solution: BA = (ab-(AB/10)) * + (AB/10) Suddenly there is a very strange idea, can you use subtraction? After observation, we found that the number of sources and the number of results added two, to get a number of loops ... Then use subtraction can also

Hello, C + + (17) 0.1*10 not equal to 1.0--4.1.4 relational operator 4.1.5 logical operator

equalConsider what the output of this code is:0.1; if (*1.0) {cout"0.1*10 equals 1.0" Endl;} else{cout"0.1*10 not equal to 1.0" Endl;} Would it surprise you if I told you that the output of this code was "0.1*10 not equal to 1.0"? It's a bit of a surprise, but that's the truth. This is because in C + +, except for some special floating-point numbers (such

Hello, C + + (17) 0.1*10 not equal to 1.0--4.1.4 relational operator 4.1.5 logical operator

floating-point numbers are equalConsider what the output of this code is: float a = 0.1 ; if (A*10 = = 1.0 " 0.1*10 equals 1.0 ENDL;} else {cout " 0.1*10 is not equal to 1.0 endl;} Would it surprise you if I told you that the output of this code was "0.1*10 not equal to 1.0"? It's a bit of a surprise,

Six things Microsoft didn't mention when Windows 10 was released

A friend who cares a little about tech news must know that Microsoft has just unveiled its next-generation operating system, Windows 10, and the technology Preview version of the system has been released for corporate users and enthusiasts. While Microsoft says Windows 10 has added a lot of functionality to many corporate users and premium customers, Microsoft's presentation of Windows

WebLogic 10 Video Tutorial __ Middleware

Video Tutorials for WebLogic 10Collected on the internet for a long time, only to find, and you share. This episode is the first to introduce the installation and initial use of WebLogic 10, I hope you like it. ======================================== Watch online: [Url]http://www.boobooke.com/v/bbk2529[/url] ======================================== This episode is the second to introduce the use of the WebLogic 1

What you need to know about the Win7 system to install the Windows 10 preview

part of the storage space. In addition, Microsoft has provided the Enterprise version of the Technology Preview version for enterprise users. After downloading, use ISO application to make it as a startup CD or a U disk, you can start installation. In addition, the deadline for its use is April 15, 2015. 5, can choose to upgrade installation There are two ways to install, one in the original system to click on the exe file to upgrade the installation, the system will retain your personal data

The conversion between 10 and 16 of the LSN

The conversion between 10 and 16 of the LSN First, 16 into the system LSN, which is the log sequence number, is divided into 3 paragraphs in 16-Sequence, in the form of: FSeqNo:SectorNo:SlotNo The meanings are: 1 1th: Fseqno is the serial number of the virtual log file (VLF) with a length of 4 bytes. 2) Sectorno is the number of sectors in the VLF and the length is 4 bytes. 3) Slotno is the number of sectors in which the log i

Teach you how to upgrade to SQL Anywhere10 (10)

Upgrade Qanywhere To upgrade the Qanywhere application, you can upgrade the consolidated database, application, and client message stores. To upgrade the consolidated database, refer to the previous document. Please read the new features and behavior changes carefully to upgrade your application. Upgrading the Qanywhere message store 1, deploy the Qanywhere file. 2. Upgrade message storage: Use the-SU or-sur option to start the Qanywhere agent. Upgrade Ultralite When upgrading an older

Sort 10 million data---programming Zhu Ji Nanxiong Second Edition Chapter One

The first chapter of this book presents a seemingly simple question, with up to 10 million different integer data in the hard disk's file, and how to sort it as quickly as possible with 1 m of memory.Each number can be stored with 4BYTE,1M 250 000 data, obviously, as long as 250 000 data sorted each time, write to the file can be repeated 40 times.So how do you choose 250,000 data for each traversal? There are two strategies:1,

See VMware Real grades from the 10-k financial report

The U.S. Securities and Exchange Commission (SEC) has released the VMware form 10-k file, and each listed company needs to describe in detail the various aspects of the operating situation in this unreserved financial statement document. " As a result of the annual report of the careful resignation, Form 10-k is obviously more flat, and therefore can bring us more credible business results.Discover the secr

Delphi to convert 10 to 16 into the function of the conversion system

Delphi has a direct conversion of 10 into the 16-system function: function Inttohex (Value:integer; Digits:integer): string; overload;function Inttohex (value:int64; Digits:integer): string; overload; Unit uconversion;InterfaceUsesSysutils,math;TypeTconversion = ClassPublic10 in to 2,8,16 systemfunction Inttobitstr (intstr:string): string;function Inttohexstr (intstr:string): STRING;//10 = 2function Intto

Python+selenium notes (10): element wait mechanism

(i) prefaceA sudden resource constraint or network delay may result in the target element not being found, and the test report shows that the test failed. In this case, a delay mechanism is required to match the speed of the script with the response speed of the program, and Webdriver provides both implicit and explicit wait mechanisms.(ii) Implicit waitOnce the implicit wait time is set, it acts on the entire life cycle of the Webdriver instance (which takes effect for all element lookups), and

Java-EE project crisis "translation"-avoid these 10 EE crisis to ensure your business success

J2ee| Project In my experience as a developer, senior developer, architect, I have encountered good, poor, and even ugly enterprise-class Java projects. When I ask myself what makes a project successful and another failure, I find it hard to get a perfect answer, as if it's hard to define all the software projects with success. The Java EE project is no exception. Therefore, the project is divided into different levels of success or failure. In this article, I want to reveal to you--the reader f

Teach you how to upgrade to SQL Anywhere 10 (3)

Rebuilding a database for version 10 This section describes how to unload the database and load it into a new version 10 database. To upgrade your Windows CE database, refer to the documentation. Attention: Unloading and loading large databases can take considerable time and disk space. The entire process takes approximately twice times the size of the database disk space to hold the unload data and the

How to find the 10 most frequently occurring frequencies from 1 billion query terms

1. Problem description In large-scale data processing, often encountered a kind of problem is to find the highest frequency of the largest number of top K, or from the mass of data to find the maximum number of the first k, such problems are commonly referred to as "top K" problem, such as: In search engines, statistical search the most popular 10 query words , in the song Library, the highest download rate of the top

10-python3 from beginner to actual combat-basic functions

): mlist.append([1, 2, 3.4, 5]) print(‘函数内读取 mlist 的值:‘, mlist) returnmlist = [10, 20, 30]changelist(mlist)print(‘函数外读取 mlist 的值:‘, mlist)Output Result: Read the value of the mlist within the function: [10, 20, 30, [1, 2, 3.4, 5]]Read the value of Mlist outside the function: [10, 20, 30, [1, 2, 3.4, 5]] anonymous functions

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