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code-problems

★ 30 Open GitHub ↗

Common code (problems from Leetcode, HackerEarth, HackerRank, CodeWars, Geeksforgeeks) and various companies hiring challenges solved in Java language

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# Code Problems
Common code (problems from [Leetcode](https://leetcode.com/), [HackerEarth](https://www.hackerearth.com/), [HackerRank](https://www.hackerrank.com/), [CodeWars](https://www.codewars.com/), [Geeksforgeeks](https://www.geeksforgeeks.org/)) and various companies hiring challenges solved in Java language

This is my repo full of code problems that I'm currently practicing prior to or during an interview, as well as general problem snippets. I hope that all these problems (and solutions) are useful to others for practice and review. Feel free to contribute any solutions and optimisations, and add your own problems that you find as well, as I would love to see them.

## Problems

### Algorithms

| S.No.  |                                                                                           Solution                   									      				 |             											      Problem														     |
|:------:|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------:|:-----------------------------------------------------------------------------------------------------------------------------:|
|   1    | [MO's Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/algorithms/MOsAlgorithm.java)     							      					 |                                 																								 |
|   2    | [Z Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/algorithms/ZAlgorithm.java)										  					 |                                 																								 |
|   3    | [Reversal Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/algorithms/ReversalAlgorithm.java)				      		  					 |                                 																								 |
|   4    | [Juggling Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/algorithms/JugglingAlgorithm.java)							  					 |                                 																								 |
|   5    | [Euclidean Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/algorithms/EuclideanAlgorithm.java)						  					 |                                 																								 |
|   6    | [One Pass Hash Table](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/leetcode/TwoSum.java)						  				  					 |                                 																								 |
|   7    | [Two Pointer Technique]     	                                                                                                                                                 | [1](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/leetcode/RemoveDuplicatesFromSortedArray.java), [2](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/leetcode/RemoveElement.java), [3](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/datastructures/LinkedList/MiddleNode.java), [4](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/datastructures/LinkedList/CycleInLinkedList.java), [5](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/datastructures/LinkedList/IntersectionLinkedList.java), [6](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/datastructures/LinkedList/RemoveNthFromEnd.java)                                                                                                                                                                                                                                                                                                                         |
|   8    | [Boyer Moore Vooting Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/leetcode/MajorityElement.java)			          					 |                                 																								 |
|   9    | [Naive Pattern Search Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/algorithms/NaivePatternMatchingAlgorithm.java)			             |	 																							                                 |
|   10   | [Optimized Naive Pattern Search Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/algorithms/OptimizedNaivePatternMatchingAlgorithm.java)   |																								                                 |
|   11   | [Rabin Karp Pattern Search Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/algorithms/RabinKarpAlgorithm.java)			                 |																								                                 |
|   12   | [Counting Sort Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/algorithms/CountingSort.java)			          							 | 																								                                 |
|   13   | [Floyd Cycle-Finding Algorithm]			          						                                                                                                     | [1](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/leetcode/HappyNumber.java), [2](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/datastructures/LinkedList/CycleInLinkedList.java)																								                                                                                                 |
|   14   | [Brian Kernighan’s Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/datastructures/BITManipulation/CountSetBits.java)			             |																								                                 |
|   15   | [In-Place Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/datastructures/LinkedList/PalindromeLinkedList.java)                            |                                                                                                                               |
|   16   | [One-Pass Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/datastructures/LinkedList/RemoveNthFromEnd.java)                                |                                                                                                                               |
|   17   | [Two-Pass Algorithm](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/datastructures/LinkedList/RemoveNthFromEnd.java)                                |                                                                                                                               |

### Data Structures

|                                                         Topic Name                                                              |	Number of Problems Solved |
|:-------------------------------------------------------------------------------------------------------------------------------:|:-------------------------:|
|  [Arrays](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/datastructures/Array)                        |            16             | 
|  [Bit Manipulation](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/datastructures/BITManipulation)    |            23             |
|  [Strings](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/datastructures/String)                      |            7              |
|  [Math](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/datastructures/Math)							  |            4              |
|  [Trie](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/datastructures/Trie)							  |            0              |
|  [Hashing](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/datastructures/Hashing)					  |            6              |
|  [Recursion](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/datastructures/Recursion)                 |            5              |
|  [Binary Heap](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/datastructures/BinaryHeap)              |            4              |
|  [Linked List](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/datastructures/LinkedList)              |            14             |

### Different Coding Sites

|                   Website                                                |                                       Number of Problems Solved                                                     |
|:------------------------------------------------------------------------:|:-------------------------------------------------------------------------------------------------------------------:|
|   [Codewars](https://www.codewars.com/)                                  |            [41](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/codewars)             	 |
|   [Hackerearth](https://www.hackerearth.com/)                            |            [19](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/hackerearth)      		 |
|   [Hackerrank](https://www.hackerrank.com/)                              |            [1](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/hackerrank)        		 |
|   [Leetcode](https://leetcode.com/)                                      |            [22](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/leetcode)         		 |     
|   [Leetcode Top Interview Questions](https://leetcode.com/)              |            [3](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/leetcode/topIntQuests)      |
|   [Namaste DSA](https://namastedev.com/learn/namaste-dsa)                |            [6](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/namasteDSA)                 |

### Company Hiring Challenges

| S.No. |                Company            |                                                                                           Solution                                                                         																																																																																																		      |
|:-----:|:---------------------------------:|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:|
|   1   | Cure Skin                         | [Speical Array Operation](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/cureskin/SpecialArrayOperation.java)                                 																																																																																																	      |
|   2   | Fidelity International            | [Animal Inheritance](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/fidelityInternational/AnimalInheritance.java) , [Custom Sort](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/fidelityInternational/CustomSort.java) , [Distance Between Two points](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/fidelityInternational/DistBetTwoPoints.java) , [Moves](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/fidelityInternational/Moves.java)  |
|   3   | NearBuy                           | [Count Duplicates](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/nearbuy/CountDuplicates.java) , [Maximum Difference](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/nearbuy/MaximumDifference.java) , [Username Disparity](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/nearbuy/UsernameDisparity.java) , [Username Disparity Simple Version](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/nearbuy/UsernameDisparitySimpleLogic.java)     |
|   4   | NinjaCart							| [Buying Stock](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/ninjaCart/BuyingStock.java)																																																																																																															  |
|   5   | Samsung R & D						| [Odd Sum Problem](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/samsungR_D/EfficientOddSumProblem.java) , [Odd Sum Problem Simple Version](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/samsungR_D/OddSumProblem.java)																																																																							  |
|  	6   | ThoughtWorks                      | [Compare Strings](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/thoughtWorks/CompareStrings.java) , [Digits in Integer](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/thoughtWorks/DigitsInInteger.java) , [Intelligent Girl](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/thoughtWorks/IntelligentGirl.java) , [Track with the Cards](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/thoughtWorks/TrickWithTheCards.java)                  |
|   7   | Trusting Social                   | [Bugs](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/trustingSocial/Bugs.java) , [Determine a winner](https://github.com/pgeek92/code-problems/blob/master/coding-problems/src/company/trustingSocial/DetermineWinner.java)                                                                                                                                                                                                                                                                                                                          |  
|   8   | HSBC                              | [Help John](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/company/HSBC/HelpJohn.java), [Sam Height](https://github.com/pgeek92/code-problems/tree/master/coding-problems/src/company/HSBC/SamHeight.java)          																                                                                            																																													          |

## Contributing

If you have a problem or solution that's not currently not included, please open an issue or pull request! If you're including new content, please make sure you have permission to publish the content you are adding. Under no circumstance should you copy problems online without a visible license or attributions.

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