Programming With Elu

  What is a Magic Number? A number is said to be a magic number, if the sum of its digits are calculated till a single digit recursively by adding the sum of the digits after every addition. If the single digit comes out to be 1,then the number is a magic number.  Answer: import   java . util . Scanner ; public   class   MagicNumber  {      public   static   void   main ( String []  args ) {          Scanner   sc  =  new   Scanner ( System . in );          System . out . println ( "Enter the number to check magic number or not" );          int   n  =  sc . nextInt ();          if ( n % 9 == 1 ){              System . out . ...

  Alice and Bob each created one problem for HackerRank. A reviewer rates the two challenges, awarding points on a scale from  1  to  100  for three categories:  problem clarity ,  originality , and  difficulty . The rating for Alice's challenge is the triplet  a = (a[0], a[1], a[2]) , and the rating for Bob's challenge is the triplet  b = (b[0], b[1], b[2]) . The task is to find their  comparison points  by comparing  a[0]  with  b[0] ,  a[1]  with  b[1] , and  a[2]  with  b[2] . If  a[i] > b[i] , then Alice is awarded  1  point. If  a[i] < b[i] , then Bob is awarded  1  point. If  a[i] = b[i] , then neither person receives a point. Comparison points is the total points a person earned. Given  a  and  b , determine their respective comparison points. Example a = [1, 2, 3] b = [3, 2, 1] For elements *0*, Bob is awarded a point b...