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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  , print  You are a teenager. . Otherwise, print  You are old. . To help you learn by example and complete this challenge, much of the code is provi
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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 Print the largest (maximum) hourglass sum found in  . Sample Input 1 1 1 0 0 0 0 1 0 0 0 0 1 1 1 0 0 0 0 0 2 4 4 0 0
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Day 27: Testing - HackerRank 30 days of code solution

This problem is all about unit testing. Your company needs a function that meets the following requirements: For a given array of   integers, the function returns the index of the element with the minimum value in the array. If there is more than one element with the minimum value, the returned index should be the smallest one. If an empty array is passed to the function, it should raise an Exception. Note: The arrays are indexed from  . A colleague has written that function, and your task is to design   separated unit tests, testing if the function behaves correctly. The implementation in Python is listed below (Implementations in other languages can be found in the code template): def minimum_index ( seq ): if len ( seq ) == 0 : raise ValueError ( "Cannot get the minimum value index from an empty sequence" ) min_idx = 0 for i in range ( 1 , len ( seq )): if a [ i ] < a [ min_idx ]: min_idx = i
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