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Day 19: Interfaces - HackerRank 30 days of code solution

Objective Today, we're learning about Interfaces. Check out the  Tutorial  tab for learning materials and an instructional video! Task The  AdvancedArithmetic  interface and the method declaration for the abstract  divisorSum(n)  method are provided for you in the editor below. Complete the implementation of  Calculator  class, which implements the  AdvancedArithmetic  interface. The implementation for the  divisorSum(n)  method must return the sum of all divisors of  . Input Format A single line containing an integer,  . Constraints Output Format You are not responsible for printing anything to stdout. The locked template code in the editor below will call your code and print the necessary output. Sample Input 6 Sample Output I implemented: AdvancedArithmetic 12 Explanation The integer   is evenly divisible by  ,  ,...
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Day 11: 2D Arrays - HackerRank 30 days of code solution

Objective Today, we're building on our knowledge of  Arrays  by adding another dimension. Check out the  Tutorial  tab for learning materials and an instructional video! Context Given a    2D Array ,  : 1 1 1 0 0 0 0 1 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 We define an hourglass in   to be a subset of values with indices falling in this pattern in  's graphical representation: a b c d e f g There are   hourglasses in  , and an  hourglass sum  is the sum of an hourglass' values. Task Calculate the hourglass sum for every hourglass in  , then print the  maximum  hourglass sum. Input Format There are   lines of input, where each line contains   space-separated integers describing  2D Array   ; every value in   will be in the inclusive range of   to  . Constraints Output Format ...
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Day 8: Dictionaries and Maps - HackerRank 30 days of code solution

Objective Today, we're learning about Key-Value pair mappings using a  Map  or  Dictionary  data structure. Task Given   names and phone numbers, assemble a phone book that maps friends' names to their respective phone numbers. You will then be given an unknown number of names to query your phone book for. For each   queried, print the associated entry from your phone book on a new line in the form  name=phoneNumber ; if an entry for   is not found, print  Not found  instead. Note:  Your phone book should be a Dictionary/Map/HashMap data structure. Input Format The first line contains an integer,  , denoting the number of entries in the phone book. Each of the   subsequent lines describes an entry in the form of   space-separated values on a single line. The first value is a friend's name, and the second value is an  -digit phone number. After the   lin...
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