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ubuntu 16.04本身是自带python的，他本身是自带2.X和3.X,两个版本，默认的是2.X。这里记录一下如果在版本间切换以及如何把python版本切换到3.X下的方法。1. See the version of Python installed in Ubuntu and the Python version currently in useLs/usr/bin/python*python--version2. Set Update-alternatives to toggle Python versionShow python in place of version informationUpdate-alternatives--list pythonShow after executionUpdate-alternatives:error:no

First install sun1.6, here I install the directory is/usr/java/jdk1.6.0_45 Then set the profile file/etc/profile (add the file at the end of the file) sudo vim/etc/profile Export java_home=/usr/java/jdk1.6.0_45 export jre_home=/usr/java/jdk1.6.0_45/jre export classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar export path= $PATH: $JAVA _home/bin Source/etc/profile Then install openjdk1.7, you can install it in Software Center, and then execute the following command after installat

Tags: ons file permissions maintenance Ali awt install Oracle ISP download systemDeepin System Manual Installation Oracle Jdk8 detailed tutorialsDownload the JDK archive from Oracle website and extract the files using sudo tar-zxf jdk***, which I placed under the HOME/DIY/JAVA/JDK path.JDK file path:/home/diy/java/jdk/jdk1.8.0_152JDK environment variable ConfigurationModifying a configuration filesudo vi/etc/profileAfter entering, knock on I, then you can edit the content.Add content at the end

Preparation: JBoss, JDK, a Java EE War pack, DockerfileNote: JBoss and JDK can not be prepared in advance, wget in the command, because I happen to have, directly copiedDockerfile content:#admln 20150120From ubuntu:14.04Maintainer admln RUN Mkdir/usr/jbossCOPY wildfly-8.2.0.final/usr/jboss/COPY javaeedocker.war/usr/jboss/standalone/deployments/RUN mkdir/usr/java/COPY jdk-7u71-linux-x64.tar.gz/usr/java/workdir/usr/java/RUN TAR-ZXF jdk-7u71-linux-x64.tar.gzRUN update-

= $PATH: $JAVA _home/bin:$ Classpathexport PATH Note the path and version of the JDK Make configuration effective Source/etc/profileConfiguring the default JDK Create a new Java version Create a new system command link in the shell with the update-alternatives command:sudoUpdate-alternatives--Install/usr/bin/javac Javac/usr/lib/jvm/jdk1.7.0_79/bin/javac1171sudoUpda

The update-alternative in Ubuntu/debian is used to manage different versions of the same software in a system.For example, the system may contain the GNU Java compiler, and the Sun's Java compiler. You can use Update-alternatives to set which of these are currently used.Its principle is to create a link in the/usr/bin, point to a file in the/etc/alternatives, and some file is a link, pointing to the current

settings can be. Ls-l--full-time/usr/java/jdk1.7.0_71 can see that the full installation time, the indication is really just installed. [Root@localhost sss]#/usr/java/jdk1.7.0_71/bin/java-version Java Version "1.7.0_71" Java (TM) SE Runtime Environment (build 1.7.0_71-b14) Java HotSpot (TM) 64-bit Server VM (build 24.71-b01, Mixedmode) As you can see, this Java is no longer an open JDK. Ok. Vi/etc/profile Add at the end of the file Export java_home=/usr/java/jdk1.7.0_71 Exportclasspath=.: $JA

Original link: http://www.cnblogs.com/Jason-Damon/archive/2012/04/21/2460850.htmlExcerpt from Baidu EncyclopediaThe Bellman-ford algorithm is a single-source shortest path algorithm with negative weights, which is very inefficient, but the code is easy to write. That is, the continuous relaxation (relaxation), each slack to update each edge, if the n-1 can be updated after the relaxation, then the picture has a negative ring (that is, the negative pow

after the task is executed. This command receives an API token, the name of the room, and the user name of the sender displayed in the message: @servers(['web' => '192.168.1.1'])@task('foo', ['on' => 'web']) ls -al@endtask@after @hipchat('token', 'room', 'Envoy')@endafter If necessary, you can also send custom messages to the HipChat room. When building a message, the available variables of the task are also available in the message: @after @hipchat('token', 'room', 'Envoy', "$task ran in

staggered road X4, Y2, X3, Y0 X1, not found? there is a X4---------Y2, X3, X0--Y1-X2 The inverse of the path attribute becomes the upper (right) graph. At this point, all the vertices in set X already have corresponding matching, that is, complete matching! That is, the maximum weight of this binary graph match! X0-Y1X1-Y0X2-Y4X3-Y3X4-Y2Maximum power value is 30What about the minimum weight matching requirement? Very simple, before solving the ownership value of the opposite number, the results

Test instructions: N students arranged to M dormitory, each student to the dormitory has a rating, positive, 0, negative, now the evaluation is negative, can not let this student go to this room, ask how to arrange to let all the students live in the dormitory and the most evaluation.Idea: When building the weight of a graph, filter out negative edges.#include #include #include #include #include #include #include #include #include #include #include #include #define Lson (rt#define Rson (rt#defin

KM algorithm binary graph maximum weighted value matching#include #include#include#includeConst intMAXN =356;Const intINF = (1 to)-1;intW[MAXN][MAXN];intLX[MAXN],LY[MAXN];intLINKY[MAXN];intVISX[MAXN],VISY[MAXN];intSLACK[MAXN];intNx,ny;BOOLFindintx) {Visx[x]=true; for(inty =0; Y ) { if(Visy[y])Continue; intt = lx[x] + ly[y]-W[x][y]; if(t==0) {Visy[y]=true; if(linky[y]==-1||find (Linky[y])) {Linky[y]=x; return true; } } Else if(Slack