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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 4: Class vs. Instance - HackerRank 30 days of code solution

Objective In this challenge, we're going to learn about the difference between a  class  and an  instance ; because this is an  Object Oriented concept, it's only enabled in certain languages. Check out the  Tutorial  tab for learning materials and an instructional video! Task Write a  Person  class with an instance variable,  , and a constructor that takes an integer,  , as a parameter. The constructor must assign   to   after confirming the argument passed as   is not negative; if a negative argument is passed as  , the constructor should set   to   and print  Age is not valid, setting age to 0. . In addition, you must write the following instance methods: yearPasses()  should increase the   instance variable by  . amIOld()  should perform the following conditional actions: If  , print  You are young. . If   and  , ...
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Day 21: Generics - HackerRank 30 days of code solution

Objective Today we're discussing Generics; be aware that  not all languages support this construct , so fewer languages are enabled for this challenge. Task Write a single generic function named  printArray ; this function must take an array of generic elements as a parameter (the exception to this is C++, which takes a  vector ). The locked  Solution  class in your editor tests your function. Note:  You must use generics to solve this challenge.  Do not  write overloaded functions. Input Format The locked  Solution  class in your editor will pass different types of arrays to your  printArray  function. Constraints You must have exactly   function named  printArray . Output Format Your  printArray  function should print each element of its generic array parameter on a new line. Solution : import java.util.*; class Printer <T> {  ...
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