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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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Day 29: Bitwise AND - HackerRank 30 days of code solution

Objective Welcome to the last day! Today, we're discussing bitwise operations. Task Given set  . Find two integers,   and   (where  ), from set   such that the value of   is the maximum possible  and also less than a given integer,  . In this case,   represents the  bitwise AND  operator. Input Format The first line contains an integer,  , the number of test cases. Each of the   subsequent lines defines a test case as   space-separated integers,   and  , respectively. Constraints Output Format For each test case, print the maximum possible value of   on a new line. Sample Input 3 5 2 8 5 2 2 Sample Output 1 4 0 Explanation All possible values of   and   are: The maximum possible value of   that is also   is  , so we p...
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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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