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Body: The data that you want to send to the server.Usually consists of a JSON formatted string. In different web applications we define certain rules for choosing the username, such as, it should consists of maximum 30 characters; it should not have any special character; it may contain one or more digits; it must starts with a letter, etc. The solutions to these problems tend to find approximate solutions to optimization problems. One popular way to read input from stdin is by using the Scanner class and specifying the Input Stream as System.in. 4. Or maybe I'm an incompetent C# programmer. As I am an front-end dev — I pick JavaScript, but it’s up to you. Its n directories are numbered from 0 to n-1, where the root directory has the number 0. Metro Land is a country located on a 2D Plane. I just started fooling around with Hackerrank today and I think the system is buggy with C#. 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