Day 0: Hello, World. Hackerrank Solution Do check My Video on Explanation of Following Code: Sample Input Welcome to 30 Days of Code! Sample Output Hello, World. Welcome to 30 Days of Code! Code: import java.io.*; import java.util.*; import java.text.*; import java.math.*; import java.util.regex.*; public class Solution { public static void main(String[] args) { // Create a Scanner object to read input from stdin. Scanner scan = new Scanner(System.in); // Read a full line of input from stdin and save it to our variable, inputString. ...