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# Hacker Rank: Day 14: Scope

Objective Today we’re discussing scope. The absolute difference between two integers, a and b, is written as |a – b|. The maximum absolute difference between two integers in a set of positive integers, elements, is the largest absolute difference between any two integers in elements. The Difference class is started for you in the editor. It has a private integer array (elements) for storin
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# Hacker Rank: Day 13: Abstract Classes

Objective Today, we will extend what we learned yesterday about Inheritance to Abstract Classes. Because this is a very specific object oriented concept, submissions are limited to the few languages that use this construct. Task Given a Book class and a Solution class, write a MyBook class that does the following: Inherits from Book    Has a parameterized constructor taking these 3 param
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# Hacker Rank: Day 12: Inheritance

Objective Today, we’re delving into Inheritance.  Task You are given two classes, Person and Student, where Person is the base class and Student is the derived class. Completed code for Person and a declaration for Student are provided for you in the editor. Observe that Student inherits all the properties of Person. Complete the Student class by writing the following: A Student class
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# Hacker Rank: Day 11: 2D Arrays

Objective Today, we are building on our knowledge of arrays by adding another dimension. ContextGiven a 6 x 6 2D Array, A: 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 A to be a subset of values with indices falling in this pattern in A‘s graphical representation: a b c d e f g There are 16 hourglasses in A, and an hourglass
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# Hacker Rank: Day 10: Binary Numbers

Objective Today, we’re working with binary numbers. Task Given a base-10 integer, n, convert it to binary (base-2). Then find and print the base-10 integer denoting the maximum number of consecutive 1‘s in n‘s binary representation. When working with different bases, it is common to show the base as a subscript. Example n = 125 The binary representation of 12510 is 11111012. In base 1
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# Linux Cron Cheat Sheet

Cron is a scheduling system for POSIX computers Notation Minute Hour Date Month Weekday Examples 10 * * * * At the 10th minute of every hour of every day */10 * * * * Every 10 minutes 10 14 * * * At 14:10 10 14 1 * * At 14:10 on the first day of the month 10 14 15 1 * At 14:10 on 15 January 0 2 15 10 * At 2 AM on 15 October 0 3 * 10 0 At 3 AM on all Sundays in October 0 3 * 10 1 At