diff --git a/DIRECTORY.md b/DIRECTORY.md
index 33266c52a..c7eb2b232 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -1,10 +1,19 @@
 
+## Backtracking
+  * [NQueens](https://github.com/TheAlgorithms/Java/blob/master/Backtracking/NQueens.java)
+  * [PowerSum](https://github.com/TheAlgorithms/Java/blob/master/Backtracking/PowerSum.java)
+
 ## Ciphers
   * [AES](https://github.com/TheAlgorithms/Java/blob/master/Ciphers/AES.java)
   * [AESEncryption](https://github.com/TheAlgorithms/Java/blob/master/Ciphers/AESEncryption.java)
+  * [affineCipher](https://github.com/TheAlgorithms/Java/blob/master/Ciphers/affineCipher.java)
+  * [AffineCipher](https://github.com/TheAlgorithms/Java/blob/master/Ciphers/AffineCipher.java)
   * [Caesar](https://github.com/TheAlgorithms/Java/blob/master/Ciphers/Caesar.java)
   * [ColumnarTranspositionCipher](https://github.com/TheAlgorithms/Java/blob/master/Ciphers/ColumnarTranspositionCipher.java)
+  * [HillCipher](https://github.com/TheAlgorithms/Java/blob/master/Ciphers/HillCipher.java)
+  * [ProductCipher](https://github.com/TheAlgorithms/Java/blob/master/Ciphers/ProductCipher.java)
   * [RSA](https://github.com/TheAlgorithms/Java/blob/master/Ciphers/RSA.java)
+  * [simpleSubCipher](https://github.com/TheAlgorithms/Java/blob/master/Ciphers/simpleSubCipher.java)
   * [SimpleSubstitutionCipher](https://github.com/TheAlgorithms/Java/blob/master/Ciphers/SimpleSubstitutionCipher.java)
   * [Vigenere](https://github.com/TheAlgorithms/Java/blob/master/Ciphers/Vigenere.java)
 
@@ -41,8 +50,10 @@
     * [BellmanFord](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Graphs/BellmanFord.java)
     * [ConnectedComponent](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Graphs/ConnectedComponent.java)
     * [Cycles](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Graphs/Cycles.java)
+    * [DIJSKSTRAS ALGORITHM](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Graphs/DIJSKSTRAS_ALGORITHM.java)
     * [FloydWarshall](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Graphs/FloydWarshall.java)
     * [Graphs](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Graphs/Graphs.java)
+    * [KahnsAlgorithm](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Graphs/KahnsAlgorithm.java)
     * [Kruskal](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Graphs/Kruskal.java)
     * [MatrixGraphs](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Graphs/MatrixGraphs.java)
     * [PrimMST](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Graphs/PrimMST.java)
@@ -67,9 +78,11 @@
     * [Merge K SortedLinkedlist](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Lists/Merge_K_SortedLinkedlist.java)
     * [MergeSortedArrayList](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Lists/MergeSortedArrayList.java)
     * [MergeSortedSinglyLinkedList](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Lists/MergeSortedSinglyLinkedList.java)
+    * [RemoveDuplicateNodes](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Lists/RemoveDuplicateNodes.java)
     * [SearchSinglyLinkedListRecursion](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Lists/SearchSinglyLinkedListRecursion.java)
     * [SinglyLinkedList](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Lists/SinglyLinkedList.java)
   * Queues
+    * [CircularQueue](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Queues/CircularQueue.java)
     * [GenericArrayListQueue](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Queues/GenericArrayListQueue.java)
     * [LinkedQueue](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Queues/LinkedQueue.java)
     * [PriorityQueues](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Queues/PriorityQueues.java)
@@ -78,6 +91,7 @@
     * [BalancedBrackets](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/BalancedBrackets.java)
     * [DecimalToAnyUsingStack](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/DecimalToAnyUsingStack.java)
     * [InfixToPostfix](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/InfixToPostfix.java)
+    * [MaximumMinimumWindow](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/MaximumMinimumWindow.java)
     * [NodeStack](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/NodeStack.java)
     * [StackArray](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/StackArray.java)
     * [StackArrayList](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/StackArrayList.java)
@@ -87,7 +101,11 @@
     * [BinaryTree](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/BinaryTree.java)
     * [BSTIterative](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/BSTIterative.java)
     * [BSTRecursive](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/BSTRecursive.java)
+    * [BSTRecursiveGeneric](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/BSTRecursiveGeneric.java)
+    * [CeilInBinarySearchTree](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/CeilInBinarySearchTree.java)
+    * [FenwickTree](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/FenwickTree.java)
     * [GenericTree](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/GenericTree.java)
+    * [LCA](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/LCA.java)
     * [LevelOrderTraversal](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/LevelOrderTraversal.java)
     * [LevelOrderTraversalQueue](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/LevelOrderTraversalQueue.java)
     * [PrintTopViewofTree](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/PrintTopViewofTree.java)
@@ -95,15 +113,20 @@
     * [TreeTraversal](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/TreeTraversal.java)
     * [TrieImp](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/TrieImp.java)
     * [ValidBSTOrNot](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/ValidBSTOrNot.java)
+    * [VerticalOrderTraversal](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Trees/VerticalOrderTraversal.java)
 
 ## DivideAndConquer
+  * [BinaryExponentiation](https://github.com/TheAlgorithms/Java/blob/master/DivideAndConquer/BinaryExponentiation.java)
   * [ClosestPair](https://github.com/TheAlgorithms/Java/blob/master/DivideAndConquer/ClosestPair.java)
   * [SkylineAlgorithm](https://github.com/TheAlgorithms/Java/blob/master/DivideAndConquer/SkylineAlgorithm.java)
+  * [StrassenMatrixMultiplication](https://github.com/TheAlgorithms/Java/blob/master/DivideAndConquer/StrassenMatrixMultiplication.java)
 
 ## DynamicProgramming
   * [BoardPath](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/BoardPath.java)
   * [BruteForceKnapsack](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/BruteForceKnapsack.java)
+  * [CatalanNumber](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/CatalanNumber.java)
   * [CoinChange](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/CoinChange.java)
+  * [DiceThrow](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/DiceThrow.java)
   * [DyanamicProgrammingKnapsack](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/DyanamicProgrammingKnapsack.java)
   * [EditDistance](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/EditDistance.java)
   * [EggDropping](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/EggDropping.java)
@@ -111,26 +134,35 @@
   * [FordFulkerson](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/FordFulkerson.java)
   * [KadaneAlgorithm](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/KadaneAlgorithm.java)
   * [Knapsack](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/Knapsack.java)
+  * [KnapsackMemoization](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/KnapsackMemoization.java)
   * [LevenshteinDistance](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/LevenshteinDistance.java)
   * [LongestCommonSubsequence](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/LongestCommonSubsequence.java)
   * [LongestIncreasingSubsequence](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/LongestIncreasingSubsequence.java)
   * [LongestPalindromicSubsequence](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/LongestPalindromicSubsequence.java)
+  * [LongestPalindromicSubstring](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/LongestPalindromicSubstring.java)
   * [LongestValidParentheses](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/LongestValidParentheses.java)
   * [MatrixChainMultiplication](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/MatrixChainMultiplication.java)
   * [MemoizationTechniqueKnapsack](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/MemoizationTechniqueKnapsack.java)
   * [MinimumPathSum](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/MinimumPathSum.java)
   * [MinimumSumPartition](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/MinimumSumPartition.java)
+  * [PalindromicPartitioning](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/PalindromicPartitioning.java)
+  * [RegexMatching](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/RegexMatching.java)
   * [RodCutting](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/RodCutting.java)
+  * [ShortestCommonSupersequenceLength](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/ShortestCommonSupersequenceLength.java)
   * [SubsetSum](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/SubsetSum.java)
+  * [Sum Of Subset](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/Sum_Of_Subset.java)
+  * [WineProblem](https://github.com/TheAlgorithms/Java/blob/master/DynamicProgramming/WineProblem.java)
 
 ## Maths
   * [AbsoluteMax](https://github.com/TheAlgorithms/Java/blob/master/Maths/AbsoluteMax.java)
   * [AbsoluteMin](https://github.com/TheAlgorithms/Java/blob/master/Maths/AbsoluteMin.java)
   * [AbsoluteValue](https://github.com/TheAlgorithms/Java/blob/master/Maths/AbsoluteValue.java)
+  * [ADTFraction](https://github.com/TheAlgorithms/Java/blob/master/Maths/ADTFraction.java)
   * [AliquotSum](https://github.com/TheAlgorithms/Java/blob/master/Maths/AliquotSum.java)
   * [AmicableNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/AmicableNumber.java)
   * [Area](https://github.com/TheAlgorithms/Java/blob/master/Maths/Area.java)
   * [Armstrong](https://github.com/TheAlgorithms/Java/blob/master/Maths/Armstrong.java)
+  * [AutomorphicNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/AutomorphicNumber.java)
   * [Average](https://github.com/TheAlgorithms/Java/blob/master/Maths/Average.java)
   * [BinaryPow](https://github.com/TheAlgorithms/Java/blob/master/Maths/BinaryPow.java)
   * [Ceil](https://github.com/TheAlgorithms/Java/blob/master/Maths/Ceil.java)
@@ -138,6 +170,9 @@
   * [Combinations](https://github.com/TheAlgorithms/Java/blob/master/Maths/Combinations.java)
   * [Convolution](https://github.com/TheAlgorithms/Java/blob/master/Maths/Convolution.java)
   * [ConvolutionFFT](https://github.com/TheAlgorithms/Java/blob/master/Maths/ConvolutionFFT.java)
+  * [DeterminantOfMatrix](https://github.com/TheAlgorithms/Java/blob/master/Maths/DeterminantOfMatrix.java)
+  * [DigitalRoot](https://github.com/TheAlgorithms/Java/blob/master/Maths/DigitalRoot.java)
+  * [DudeneyNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/DudeneyNumber.java)
   * [EulerMethod](https://github.com/TheAlgorithms/Java/blob/master/Maths/EulerMethod.java)
   * [Factorial](https://github.com/TheAlgorithms/Java/blob/master/Maths/Factorial.java)
   * [FactorialRecursion](https://github.com/TheAlgorithms/Java/blob/master/Maths/FactorialRecursion.java)
@@ -151,11 +186,19 @@
   * [Floor](https://github.com/TheAlgorithms/Java/blob/master/Maths/Floor.java)
   * [GCD](https://github.com/TheAlgorithms/Java/blob/master/Maths/GCD.java)
   * [GCDRecursion](https://github.com/TheAlgorithms/Java/blob/master/Maths/GCDRecursion.java)
+  * [GenericRoot](https://github.com/TheAlgorithms/Java/blob/master/Maths/GenericRoot.java)
+  * [HarshadNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/HarshadNumber.java)
+  * [KeithNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/KeithNumber.java)
+  * [KrishnamurthyNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/KrishnamurthyNumber.java)
+  * [LeonardoNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/LeonardoNumber.java)
   * [LucasSeries](https://github.com/TheAlgorithms/Java/blob/master/Maths/LucasSeries.java)
+  * [MagicSquare](https://github.com/TheAlgorithms/Java/blob/master/Maths/MagicSquare.java)
   * [MaxValue](https://github.com/TheAlgorithms/Java/blob/master/Maths/MaxValue.java)
   * [Median](https://github.com/TheAlgorithms/Java/blob/master/Maths/Median.java)
   * [MinValue](https://github.com/TheAlgorithms/Java/blob/master/Maths/MinValue.java)
   * [Mode](https://github.com/TheAlgorithms/Java/blob/master/Maths/Mode.java)
+  * [NonRepeatingElement](https://github.com/TheAlgorithms/Java/blob/master/Maths/NonRepeatingElement.java)
+  * [NthUglyNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/NthUglyNumber.java)
   * [NumberOfDigits](https://github.com/TheAlgorithms/Java/blob/master/Maths/NumberOfDigits.java)
   * [PalindromeNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/PalindromeNumber.java)
   * [ParseInteger](https://github.com/TheAlgorithms/Java/blob/master/Maths/ParseInteger.java)
@@ -169,23 +212,31 @@
   * [PrimeCheck](https://github.com/TheAlgorithms/Java/blob/master/Maths/PrimeCheck.java)
   * [PrimeFactorization](https://github.com/TheAlgorithms/Java/blob/master/Maths/PrimeFactorization.java)
   * [PythagoreanTriple](https://github.com/TheAlgorithms/Java/blob/master/Maths/PythagoreanTriple.java)
+  * [RomanNumeralUtil](https://github.com/TheAlgorithms/Java/blob/master/Maths/RomanNumeralUtil.java)
   * [SumOfArithmeticSeries](https://github.com/TheAlgorithms/Java/blob/master/Maths/SumOfArithmeticSeries.java)
   * [SumOfDigits](https://github.com/TheAlgorithms/Java/blob/master/Maths/SumOfDigits.java)
   * [VampireNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/VampireNumber.java)
+  * [VectorCrossProduct](https://github.com/TheAlgorithms/Java/blob/master/Maths/VectorCrossProduct.java)
+
+## MatrixExponentiation
+  * [Fibonacci](https://github.com/TheAlgorithms/Java/blob/master/MatrixExponentiation/Fibonacci.java)
 
 ## MinimizingLateness
   * [MinimizingLateness](https://github.com/TheAlgorithms/Java/blob/master/MinimizingLateness/MinimizingLateness.java)
 
 ## Misc
   * [ColorContrastRatio](https://github.com/TheAlgorithms/Java/blob/master/Misc/ColorContrastRatio.java)
+  * [InverseOfMatrix](https://github.com/TheAlgorithms/Java/blob/master/Misc/InverseOfMatrix.java)
   * [matrixTranspose](https://github.com/TheAlgorithms/Java/blob/master/Misc/matrixTranspose.java)
   * [MedianOfRunningArray](https://github.com/TheAlgorithms/Java/blob/master/Misc/MedianOfRunningArray.java)
   * [PalindromePrime](https://github.com/TheAlgorithms/Java/blob/master/Misc/PalindromePrime.java)
   * [RangeInSortedArray](https://github.com/TheAlgorithms/Java/blob/master/Misc/RangeInSortedArray.java)
+  * [TwoSumProblem](https://github.com/TheAlgorithms/Java/blob/master/Misc/TwoSumProblem.java)
   * [WordBoggle](https://github.com/TheAlgorithms/Java/blob/master/Misc/WordBoggle.java)
 
 ## Others
   * [BestFit](https://github.com/TheAlgorithms/Java/blob/master/Others/BestFit.java)
+  * [BFPRT](https://github.com/TheAlgorithms/Java/blob/master/Others/BFPRT.java)
   * [BrianKernighanAlgorithm](https://github.com/TheAlgorithms/Java/blob/master/Others/BrianKernighanAlgorithm.java)
   * [CountChar](https://github.com/TheAlgorithms/Java/blob/master/Others/CountChar.java)
   * [CountWords](https://github.com/TheAlgorithms/Java/blob/master/Others/CountWords.java)
@@ -193,17 +244,21 @@
   * [CRCAlgorithm](https://github.com/TheAlgorithms/Java/blob/master/Others/CRCAlgorithm.java)
   * [Dijkstra](https://github.com/TheAlgorithms/Java/blob/master/Others/Dijkstra.java)
   * [EulersFunction](https://github.com/TheAlgorithms/Java/blob/master/Others/EulersFunction.java)
-  * [FibToN](https://github.com/TheAlgorithms/Java/blob/master/Others/FibToN.java)
+  * [FibbonaciSeries](https://github.com/TheAlgorithms/Java/blob/master/Others/FibbonaciSeries.java)
   * [FirstFit](https://github.com/TheAlgorithms/Java/blob/master/Others/FirstFit.java)
   * [FloydTriangle](https://github.com/TheAlgorithms/Java/blob/master/Others/FloydTriangle.java)
   * [GuassLegendre](https://github.com/TheAlgorithms/Java/blob/master/Others/GuassLegendre.java)
+  * [Implementing auto completing features using trie](https://github.com/TheAlgorithms/Java/blob/master/Others/Implementing_auto_completing_features_using_trie.java)
   * [InsertDeleteInArray](https://github.com/TheAlgorithms/Java/blob/master/Others/InsertDeleteInArray.java)
   * [KMP](https://github.com/TheAlgorithms/Java/blob/master/Others/KMP.java)
   * [KochSnowflake](https://github.com/TheAlgorithms/Java/blob/master/Others/KochSnowflake.java)
   * [Krishnamurthy](https://github.com/TheAlgorithms/Java/blob/master/Others/Krishnamurthy.java)
   * [LinearCongruentialGenerator](https://github.com/TheAlgorithms/Java/blob/master/Others/LinearCongruentialGenerator.java)
   * [LowestBasePalindrome](https://github.com/TheAlgorithms/Java/blob/master/Others/LowestBasePalindrome.java)
+  * [Luhn](https://github.com/TheAlgorithms/Java/blob/master/Others/Luhn.java)
   * [Mandelbrot](https://github.com/TheAlgorithms/Java/blob/master/Others/Mandelbrot.java)
+  * [MiniMaxAlgorithm](https://github.com/TheAlgorithms/Java/blob/master/Others/MiniMaxAlgorithm.java)
+  * [PageRank](https://github.com/TheAlgorithms/Java/blob/master/Others/PageRank.java)
   * [PasswordGen](https://github.com/TheAlgorithms/Java/blob/master/Others/PasswordGen.java)
   * [PerlinNoise](https://github.com/TheAlgorithms/Java/blob/master/Others/PerlinNoise.java)
   * [QueueUsingTwoStacks](https://github.com/TheAlgorithms/Java/blob/master/Others/QueueUsingTwoStacks.java)
@@ -221,6 +276,7 @@
   * [SkylineProblem](https://github.com/TheAlgorithms/Java/blob/master/Others/SkylineProblem.java)
   * [StackPostfixNotation](https://github.com/TheAlgorithms/Java/blob/master/Others/StackPostfixNotation.java)
   * [StringMatchFiniteAutomata](https://github.com/TheAlgorithms/Java/blob/master/Others/StringMatchFiniteAutomata.java)
+  * [Sudoku](https://github.com/TheAlgorithms/Java/blob/master/Others/Sudoku.java)
   * [ThreeSum](https://github.com/TheAlgorithms/Java/blob/master/Others/ThreeSum.java)
   * [TopKWords](https://github.com/TheAlgorithms/Java/blob/master/Others/TopKWords.java)
   * [TowerOfHanoi](https://github.com/TheAlgorithms/Java/blob/master/Others/TowerOfHanoi.java)
@@ -229,15 +285,21 @@
 
 ## Searches
   * [BinarySearch](https://github.com/TheAlgorithms/Java/blob/master/Searches/BinarySearch.java)
+  * [ExponentalSearch](https://github.com/TheAlgorithms/Java/blob/master/Searches/ExponentalSearch.java)
+  * [HowManyTimesRotated](https://github.com/TheAlgorithms/Java/blob/master/Searches/HowManyTimesRotated.java)
   * [InterpolationSearch](https://github.com/TheAlgorithms/Java/blob/master/Searches/InterpolationSearch.java)
   * [IterativeBinarySearch](https://github.com/TheAlgorithms/Java/blob/master/Searches/IterativeBinarySearch.java)
   * [IterativeTernarySearch](https://github.com/TheAlgorithms/Java/blob/master/Searches/IterativeTernarySearch.java)
   * [JumpSearch](https://github.com/TheAlgorithms/Java/blob/master/Searches/JumpSearch.java)
   * [LinearSearch](https://github.com/TheAlgorithms/Java/blob/master/Searches/LinearSearch.java)
+  * [LowerBound](https://github.com/TheAlgorithms/Java/blob/master/Searches/LowerBound.java)
+  * [MonteCarloTreeSearch](https://github.com/TheAlgorithms/Java/blob/master/Searches/MonteCarloTreeSearch.java)
   * [PerfectBinarySearch](https://github.com/TheAlgorithms/Java/blob/master/Searches/PerfectBinarySearch.java)
   * [SaddlebackSearch](https://github.com/TheAlgorithms/Java/blob/master/Searches/SaddlebackSearch.java)
   * [SearchAlgorithm](https://github.com/TheAlgorithms/Java/blob/master/Searches/SearchAlgorithm.java)
+  * [SquareRootBinarySearch](https://github.com/TheAlgorithms/Java/blob/master/Searches/SquareRootBinarySearch.java)
   * [TernarySearch](https://github.com/TheAlgorithms/Java/blob/master/Searches/TernarySearch.java)
+  * [UnionFind](https://github.com/TheAlgorithms/Java/blob/master/Searches/UnionFind.java)
 
 ## Sorts
   * [BitonicSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/BitonicSort.java)
@@ -249,18 +311,25 @@
   * [CombSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/CombSort.java)
   * [CountingSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/CountingSort.java)
   * [CycleSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/CycleSort.java)
+  * [DNFSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/DNFSort.java)
   * [GnomeSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/GnomeSort.java)
   * [HeapSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/HeapSort.java)
   * [InsertionSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/InsertionSort.java)
   * [MergeSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/MergeSort.java)
+  * [MergeSortRecursive](https://github.com/TheAlgorithms/Java/blob/master/Sorts/MergeSortRecursive.java)
   * [PancakeSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/PancakeSort.java)
   * [QuickSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/QuickSort.java)
   * [RadixSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/RadixSort.java)
   * [SelectionSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/SelectionSort.java)
   * [ShellSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/ShellSort.java)
+  * [SimpleSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/SimpleSort.java)
+  * [SlowSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/SlowSort.java)
   * [SortAlgorithm](https://github.com/TheAlgorithms/Java/blob/master/Sorts/SortAlgorithm.java)
   * [SortUtils](https://github.com/TheAlgorithms/Java/blob/master/Sorts/SortUtils.java)
+  * [StoogeSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/StoogeSort.java)
+  * [SwapSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/SwapSort.java)
   * [TimSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/TimSort.java)
+  * [TreeSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/TreeSort.java)
 
 ## Strings
   * [Alphabetical](https://github.com/TheAlgorithms/Java/blob/master/Strings/Alphabetical.java)
@@ -268,9 +337,12 @@
   * [CheckAnagrams](https://github.com/TheAlgorithms/Java/blob/master/Strings/CheckAnagrams.java)
   * [CheckVowels](https://github.com/TheAlgorithms/Java/blob/master/Strings/CheckVowels.java)
   * [HorspoolSearch](https://github.com/TheAlgorithms/Java/blob/master/Strings/HorspoolSearch.java)
+  * [List all Possible Words From Phone Digits](https://github.com/TheAlgorithms/Java/blob/master/Strings/List_all_Possible_Words_From_Phone_Digits.java)
+  * [LongestPalindromicSubstring](https://github.com/TheAlgorithms/Java/blob/master/Strings/LongestPalindromicSubstring.java)
   * [Lower](https://github.com/TheAlgorithms/Java/blob/master/Strings/Lower.java)
   * [Palindrome](https://github.com/TheAlgorithms/Java/blob/master/Strings/Palindrome.java)
   * [Pangram](https://github.com/TheAlgorithms/Java/blob/master/Strings/Pangram.java)
   * [ReverseString](https://github.com/TheAlgorithms/Java/blob/master/Strings/ReverseString.java)
   * [Rotation](https://github.com/TheAlgorithms/Java/blob/master/Strings/Rotation.java)
   * [Upper](https://github.com/TheAlgorithms/Java/blob/master/Strings/Upper.java)
+  * [WordLadder](https://github.com/TheAlgorithms/Java/blob/master/Strings/WordLadder.java)
diff --git a/Maths/ADTFraction.java b/Maths/ADTFraction.java
new file mode 100644
index 000000000..bb69f0326
--- /dev/null
+++ b/Maths/ADTFraction.java
@@ -0,0 +1,106 @@
+
+package Maths;
+
+
+public class ADTFraction {
+
+   
+    public static void main(String[] args) {
+        // TODO code application logic here
+
+        ADTFraction f1 = new ADTFraction(3, 5);
+        f1.display();
+        ADTFraction f2 = new ADTFraction(7, 8);
+        f2.display();
+        ADTFraction f3 = f1.plus(f2);
+        f3.display();
+        ADTFraction f4 = f1.times(f2);
+        f4.display();
+        ADTFraction f5 = f1.times(4);
+        f5.display();
+
+    }
+
+}
+
+class ADTFraction {
+    private int n; //numerator
+    private int d; //denomenator
+
+    public ADTFraction() {
+        this.n = 0;
+        this.d = 1;
+    }
+
+    public ADTFraction(int a, int b) {//parameter constructor
+
+        if (b != 0) {
+            this.n = a;
+            this.d = b;
+        } else {
+            this.n = 0;
+            this.d = 1;
+            System.out.println("denomerator cannot be 0,default values assinged");
+        }
+    }
+
+    public void set(int a, int b) {//set numerator and denomenator
+
+        if (b != 0) {
+            this.n = a;
+            this.d = b;
+        } else {
+            this.n = 0;
+            this.d = 1;
+            System.out.println("denomerator cannot be 0,default values assinged");
+        }
+
+    }
+
+    //add two fractions
+    public ADTFraction plus(ADTFraction x) {
+
+        int num, den;
+        num = this.d * x.n + this.n * x.d;
+        den = this.d * x.d;
+        ADTFraction f = new ADTFraction(num, den);
+        return f;
+
+    }
+
+    public ADTFraction times(int a) {//multiply fraction by a number
+
+        int num, den;
+        num = this.n * a;
+        den = this.d;
+        ADTFraction f1 = new ADTFraction(num, den);
+        return f1;
+
+    }
+
+    public ADTFraction times(ADTFraction x) {//multiply two fractions
+
+        int num, dem;
+        num = this.n * x.n;
+        dem = this.d * x.d;
+        ADTFraction f3 = new ADTFraction(num, dem);
+        return f3;
+
+    }
+
+    //reciprocal of a fraction
+    public ADTFraction reciprocal() {
+        ADTFraction f1 = new ADTFraction(this.d, this.n);
+        return f1;
+    }
+
+    //numerical value of a fraction
+    public float value() {
+        return (float) this.n / this.d;
+    }
+
+    //display the fraction in the format n/d
+    public void display() {
+        System.out.println(this.n + "/" + this.d);
+    }
+}