hackerrank
                                Solutions of Hackerrank challenges in various languages - Scala, Java, Javascript, Ruby, ...
                            
                        How to download and setup hackerrank
Open terminal and run command
                                            git clone https://github.com/PaulNoth/hackerrank.git
                                        
                                        git clone is used to create a copy or clone of hackerrank repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with hackerrank https://github.com/PaulNoth/hackerrank/archive/master.zip
Or simply clone hackerrank with SSH
                                            [email protected]:PaulNoth/hackerrank.git                                    
                                    If you have some problems with hackerrank
You may open issue on hackerrank support forum (system) here: https://github.com/PaulNoth/hackerrank/issuesSimilar to hackerrank repositories
Here you may see hackerrank alternatives and analogs
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