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Objective Today, we're learning about Key-Value pair mappings using a Map or Dictionary data structure. Check out the Tutorial tab for learning materials and an instructional video!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, p..

Objective Today, we're learning about the Array data structure. Check out the Tutorial tab for learning materials and an instructional video!Task Given an array, , of integers, print 's elements in reverse order as a single line of space-separated numbers.Input FormatThe first line contains an integer, (the size of our array). The second line contains space-separated integers describing array 's..

Objective Today we're expanding our knowledge of Strings and combining it with what we've already learned about loops. Check out the Tutorial tab for learning materials and an instructional video!Task Given a string, , of length that is indexed from to , print its even-indexed and odd-indexed characters as space-separated strings on a single line (see the Sample below for more detail).Note: is c..

Objective In this challenge, we're going to use loops to help us do some simple math. Check out the Tutorial tab to learn more.Task Given an integer, , print its first multiples. Each multiple (where ) should be printed on a new line in the form: n x i = result.Input FormatA single integer, .ConstraintsOutput FormatPrint lines of output; each line (where ) contains the of in the form: n x i = re..

Objective In this challenge, we're going to learn about the difference between a class and an instance; because this is an Object Orientedconcept, 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..

Objective In this challenge, we're getting started with conditional statements. Check out the Tutorial tab for learning materials and an instructional video!Task Given an integer, , perform the following conditional actions:If is odd, print WeirdIf is even and in the inclusive range of to , print Not WeirdIf is even and in the inclusive range of to , print WeirdIf is even and greater than , prin..

Objective In this challenge, you'll work with arithmetic operators. Check out the Tutorial tab for learning materials and an instructional video! Task Given the meal price (base cost of a meal), tip percent (the percentage of the meal price being added as tip), and tax percent(the percentage of the meal price being added as tax) for a meal, find and print the meal's total cost. Note: Be sure to ..

Objective Today, we're discussing data types. Check out the Tutorial tab for learning materials and an instructional video! Task Complete the code in the editor below. The variables , , and are already declared and initialized for you. You must:Declare variables: one of type int, one of type double, and one of type String.Read lines of input from stdin (according to the sequence given in the Inp..

"객체지향은 현실세계의 모방, 추상화하는 것은 아니다. 소프트웨어 안에 구현된 상품 객체는 실제 세계의 상품과는 전혀 다른 양상을 띤다. 오히려 현실세계를 기반으로 새로운 세계를 창조하는 것과 같다." 이 말이 이 책의 모든 내용을 함축하고 있다. 현실세계의 객체들은 수동적인 자세를 취하고 "인간"이라는 능동적인 객체가 직접적인 영향을 미치지만 소프트웨어세계에는 인간이 없다. 그래서 객체는 스스로 움직여야 한다. 현실세계에서는 사람이 음료수를 마시지만 소프트웨어세계에서는 사람이 음료수를 직접 마실 수 없다. 사람은 음료수에게 음료수를 이만큼 먹겠다는 메시지를 보내고 음료수는 그 메세지를 수신해서 스스로 그만큼의 양을 줄인다. 이것이 소프트웨어세계에서 객체들이 동작하는 방식이다. 소프트웨어세계에서는 모든 ..

Objective In this challenge, we review some basic concepts that will get you started with this series. You will need to use the same (or similar) syntax to read input and write output in challenges throughout HackerRank. Check out the Tutorial tab for learning materials and an instructional video! Task To complete this challenge, you must save a line of input from stdin to a variable, print Hell..