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RabbitMQ(3)Install on CentOS 1. Install erlang >sudo wget -O /etc/yum.repos.d/epel-erlang.repo http://repos.fedorapeople.org/repos/peter/erlang/epel-erlang.repo >sudo yum update >sudo yum instal...

Compiler Principle(1)Lex and Yacc1. Some ConceptAbstract Syntax Tree ASTLex - Lexical AnalyzerYacc - Yet Another Compiler Compiler2. Lex>lex --versionflex 2.5.35 Apple(flex-31)Declare the wordCou...

Git Roll Back to CommitsRecently, my friends just wrongly commit his local changes to our master branch.Here is the way to roll it back.>git reset —hard <old-commit-number-from-browser>>gi...

Algorithm Basic(1)Algorithm in Java 1. BasicTime  O(1), O(n),  O(n^2), O(n^3), O(2^n)Storage array is set, it is fast, but the length is set.Collection      —List can have repeat objects          —A...

Interview(1)Algorithm Book Chapter 1 Algorithm Basic Sorting A[0.. n-1], 0=0 outputs: 2 * 2 * 2 …r { if(r = 0) return 1; if(r is odd) return 2 * sqr(Power((r-1)/2)); else ...