PHP Preparation Kit for HackerRank

This repository is structured to help you prepare for coding challenges. Each week, you'll find tasks to solve, along with necessary information and tests.

It includes hackerrank solition of the following challanges in 3 month preparation kit (3MonthPreparationKit):

• Week 1
  • 1 Plus Minus
  • 2 Mini Max Sum
  • 3 Time Conversion
  • 4 Breaking The Records
  • 5 Camel Case 4
  • 6 Divisble Sum Pairs
  • 7 Sparse Arrays
  • 8 Test Find Median
• Week 2
  • 1 Lonely Integer
  • 2 Grading Students
  • 3 Flipping Bits
  • 4 Diagonal Difference
  • 5 Counting Sort
  • 6 Counting Valleys
  • 7 Pangrams
  • 9 Test Flipping The Matrix
• Week3
  • 1 Permuting Two Arrays
  • 2 Subarray Division 2
  • 3 XOR Strings - available in c++ only
  • 4 Sales By Match
  • 7 Migratory Birds
  • 8 Drawing Book
  • 9 Test Between Two Sets
• Week4
  • 1 Picking Numbers\
  • 2 Left Rotation
  • 3 Number Line Jumps
  • 4 Separate The Number
  • 5 Closest Number
  • 7 Minimum Absolute Difference in an Array
  • 8 Caesar Cipher
• Week12
  • 6 No Prefix Set
• Week 13
  • 1 Find The Running Median
  • 2 Contacts

Directory Structure example

[3MonthPreparationKit]
    - [Week13]
        -[1_FindTheRunningMedian]
            - solution.php
            - info.txt
            - test.php
            - [testcases]
                - 1-input.txt
                - 1-output.txt
                - 2-input.txt
                - 2-output.txt
                - 3-input.txt
                - 3-output.txt
        
    [OtherTasks]
    - 1
        - solutionsInfo.md
        - task.txt
        - task1_solution1.php
        - task1_solution2.php
        - task1_solution3.php
        - task2_solution1.php
        - task2_solution2.php
        - task2_solution3.php

File Descriptions

• solution.php: The file you can copy-paste into the HackerRank editor and run the code.
• info.txt: Information about what you need to learn to solve the task.
• test.php: The code with data to test and compare if it works correctly. (In the future, this might be done with PHPUnit).
• testcases/: Contains input and expected output files for tests. You will find there %number_of_case%-input.txt and %number_of_case%-output.txt files. The first one is the input data for the test.php file and the second one is the expected output.

Some of the tasks doesnt have info or test files - feel free to add and make PR.

It also has 1 Week preparation kit 1WeekPreparationKit whith the following tasks

• 1WeekPreparationKit
  • Day1
    • 1 Plus Minus
    • 2 Mini Max Sum
    • 3 Time Conversion
    • 4 Test
  • Day2
    • 1 Lonely Integer
    • 2 Diagonal Difference
    • 3 Counting Sort
    • 4 Test
  • Day3
    • 1 Zig Zag Sequence - this one is not accepted by hackerrank even thought output is same as expected
    • 3 Caesar Cipher
    • 4 Test
  • Day4
    • 1 Grid Challenge
    • 2 Recursive Digit Sum
    • 3 New Year Chaos
    • 4 Test
  • Day7
    • 3 No Prefix Set

To run test navigate to folder and run php test.php Example:

cd 3MonthPreparationKit/Week13/1_FindTheRunningMedian
php test.php

And for sure we have other similar tasks from different sources. In folder OtherTasks you can find interesting tasks from different interviews and coding challenges.

• Other Tasks
  • 1 Given an array of NN integers, find the number of subarrays that sum up to K.
  • 2 Find the maximum result from an array of numbers using four mathematical operations
  • 3 Celebrity lookup
  • 4 House Robber

At OtherTasks you can find interesting tasks from different interviews and coding challenges.

Coffee

If you want to by me a coffee - just do it: