Update DIRECTORY.md

Author: DenizAltunkapan

DIRECTORY.md

@@ -78,6 +78,7 @@
           - 📄 [DES](src/main/java/com/thealgorithms/ciphers/DES.java)
           - 📄 [DiffieHellman](src/main/java/com/thealgorithms/ciphers/DiffieHellman.java)
           - 📄 [ECC](src/main/java/com/thealgorithms/ciphers/ECC.java)
+          - 📄 [ElGamalCipher](src/main/java/com/thealgorithms/ciphers/ElGamalCipher.java)
           - 📄 [HillCipher](src/main/java/com/thealgorithms/ciphers/HillCipher.java)
           - 📄 [MonoAlphabetic](src/main/java/com/thealgorithms/ciphers/MonoAlphabetic.java)
           - 📄 [OneTimePadCipher](src/main/java/com/thealgorithms/ciphers/OneTimePadCipher.java)
@@ -232,6 +233,7 @@
             - 📄 [MergeKSortedLinkedList](src/main/java/com/thealgorithms/datastructures/lists/MergeKSortedLinkedList.java)
             - 📄 [MergeSortedArrayList](src/main/java/com/thealgorithms/datastructures/lists/MergeSortedArrayList.java)
             - 📄 [MergeSortedSinglyLinkedList](src/main/java/com/thealgorithms/datastructures/lists/MergeSortedSinglyLinkedList.java)
+            - 📄 [MiddleOfLinkedList](src/main/java/com/thealgorithms/datastructures/lists/MiddleOfLinkedList.java)
             - 📄 [QuickSortLinkedList](src/main/java/com/thealgorithms/datastructures/lists/QuickSortLinkedList.java)
             - 📄 [RandomNode](src/main/java/com/thealgorithms/datastructures/lists/RandomNode.java)
             - 📄 [ReverseKGroup](src/main/java/com/thealgorithms/datastructures/lists/ReverseKGroup.java)
@@ -439,6 +441,7 @@
           - 📄 [AutoCorrelation](src/main/java/com/thealgorithms/maths/AutoCorrelation.java)
           - 📄 [AutomorphicNumber](src/main/java/com/thealgorithms/maths/AutomorphicNumber.java)
           - 📄 [Average](src/main/java/com/thealgorithms/maths/Average.java)
+          - 📄 [BellNumbers](src/main/java/com/thealgorithms/maths/BellNumbers.java)
           - 📄 [BinaryPow](src/main/java/com/thealgorithms/maths/BinaryPow.java)
           - 📄 [BinomialCoefficient](src/main/java/com/thealgorithms/maths/BinomialCoefficient.java)
           - 📄 [CatalanNumbers](src/main/java/com/thealgorithms/maths/CatalanNumbers.java)
@@ -453,6 +456,7 @@
           - 📄 [CrossCorrelation](src/main/java/com/thealgorithms/maths/CrossCorrelation.java)
           - 📄 [DeterminantOfMatrix](src/main/java/com/thealgorithms/maths/DeterminantOfMatrix.java)
           - 📄 [DigitalRoot](src/main/java/com/thealgorithms/maths/DigitalRoot.java)
+          - 📄 [DistanceBetweenTwoPoints](src/main/java/com/thealgorithms/maths/DistanceBetweenTwoPoints.java)
           - 📄 [DistanceFormula](src/main/java/com/thealgorithms/maths/DistanceFormula.java)
           - 📄 [DudeneyNumber](src/main/java/com/thealgorithms/maths/DudeneyNumber.java)
           - 📄 [EulerMethod](src/main/java/com/thealgorithms/maths/EulerMethod.java)
@@ -637,6 +641,11 @@
           - 📄 [SimplePendulumRK4](src/main/java/com/thealgorithms/physics/SimplePendulumRK4.java)
           - 📄 [SnellLaw](src/main/java/com/thealgorithms/physics/SnellLaw.java)
           - 📄 [ThinLens](src/main/java/com/thealgorithms/physics/ThinLens.java)
+        - 📁 **prefixsum**
+          - 📄 [DifferenceArray](src/main/java/com/thealgorithms/prefixsum/DifferenceArray.java)
+          - 📄 [PrefixSum](src/main/java/com/thealgorithms/prefixsum/PrefixSum.java)
+          - 📄 [PrefixSum2D](src/main/java/com/thealgorithms/prefixsum/PrefixSum2D.java)
+          - 📄 [SubarraySumEqualsK](src/main/java/com/thealgorithms/prefixsum/SubarraySumEqualsK.java)
         - 📁 **puzzlesandgames**
           - 📄 [TowerOfHanoi](src/main/java/com/thealgorithms/puzzlesandgames/TowerOfHanoi.java)
           - 📄 [WordBoggle](src/main/java/com/thealgorithms/puzzlesandgames/WordBoggle.java)
@@ -703,6 +712,7 @@
           - 📄 [RabinKarpAlgorithm](src/main/java/com/thealgorithms/searches/RabinKarpAlgorithm.java)
           - 📄 [RandomSearch](src/main/java/com/thealgorithms/searches/RandomSearch.java)
           - 📄 [RecursiveBinarySearch](src/main/java/com/thealgorithms/searches/RecursiveBinarySearch.java)
+          - 📄 [RotatedBinarySearch](src/main/java/com/thealgorithms/searches/RotatedBinarySearch.java)
           - 📄 [RowColumnWiseSorted2dArrayBinarySearch](src/main/java/com/thealgorithms/searches/RowColumnWiseSorted2dArrayBinarySearch.java)
           - 📄 [SaddlebackSearch](src/main/java/com/thealgorithms/searches/SaddlebackSearch.java)
           - 📄 [SearchInARowAndColWiseSortedMatrix](src/main/java/com/thealgorithms/searches/SearchInARowAndColWiseSortedMatrix.java)
@@ -712,6 +722,7 @@
           - 📄 [UnionFind](src/main/java/com/thealgorithms/searches/UnionFind.java)
           - 📄 [UpperBound](src/main/java/com/thealgorithms/searches/UpperBound.java)
         - 📁 **slidingwindow**
+          - 📄 [CountNiceSubarrays](src/main/java/com/thealgorithms/slidingwindow/CountNiceSubarrays.java)
           - 📄 [LongestSubarrayWithSumLessOrEqualToK](src/main/java/com/thealgorithms/slidingwindow/LongestSubarrayWithSumLessOrEqualToK.java)
           - 📄 [LongestSubstringWithoutRepeatingCharacters](src/main/java/com/thealgorithms/slidingwindow/LongestSubstringWithoutRepeatingCharacters.java)
           - 📄 [MaxSumKSizeSubarray](src/main/java/com/thealgorithms/slidingwindow/MaxSumKSizeSubarray.java)
@@ -757,6 +768,7 @@
           - 📄 [SelectionSortRecursive](src/main/java/com/thealgorithms/sorts/SelectionSortRecursive.java)
           - 📄 [ShellSort](src/main/java/com/thealgorithms/sorts/ShellSort.java)
           - 📄 [SlowSort](src/main/java/com/thealgorithms/sorts/SlowSort.java)
+          - 📄 [SmoothSort](src/main/java/com/thealgorithms/sorts/SmoothSort.java)
           - 📄 [SortAlgorithm](src/main/java/com/thealgorithms/sorts/SortAlgorithm.java)
           - 📄 [SortUtils](src/main/java/com/thealgorithms/sorts/SortUtils.java)
           - 📄 [SortUtilsRandomGenerator](src/main/java/com/thealgorithms/sorts/SortUtilsRandomGenerator.java)
@@ -767,6 +779,7 @@
           - 📄 [SwapSort](src/main/java/com/thealgorithms/sorts/SwapSort.java)
           - 📄 [TimSort](src/main/java/com/thealgorithms/sorts/TimSort.java)
           - 📄 [TopologicalSort](src/main/java/com/thealgorithms/sorts/TopologicalSort.java)
+          - 📄 [TournamentSort](src/main/java/com/thealgorithms/sorts/TournamentSort.java)
           - 📄 [TreeSort](src/main/java/com/thealgorithms/sorts/TreeSort.java)
           - 📄 [WaveSort](src/main/java/com/thealgorithms/sorts/WaveSort.java)
           - 📄 [WiggleSort](src/main/java/com/thealgorithms/sorts/WiggleSort.java)
@@ -910,6 +923,7 @@
           - 📄 [DESTest](src/test/java/com/thealgorithms/ciphers/DESTest.java)
           - 📄 [DiffieHellmanTest](src/test/java/com/thealgorithms/ciphers/DiffieHellmanTest.java)
           - 📄 [ECCTest](src/test/java/com/thealgorithms/ciphers/ECCTest.java)
+          - 📄 [ElGamalCipherTest](src/test/java/com/thealgorithms/ciphers/ElGamalCipherTest.java)
           - 📄 [HillCipherTest](src/test/java/com/thealgorithms/ciphers/HillCipherTest.java)
           - 📄 [MonoAlphabeticTest](src/test/java/com/thealgorithms/ciphers/MonoAlphabeticTest.java)
           - 📄 [OneTimePadCipherTest](src/test/java/com/thealgorithms/ciphers/OneTimePadCipherTest.java)
@@ -1049,6 +1063,7 @@
             - 📄 [MergeKSortedLinkedListTest](src/test/java/com/thealgorithms/datastructures/lists/MergeKSortedLinkedListTest.java)
             - 📄 [MergeSortedArrayListTest](src/test/java/com/thealgorithms/datastructures/lists/MergeSortedArrayListTest.java)
             - 📄 [MergeSortedSinglyLinkedListTest](src/test/java/com/thealgorithms/datastructures/lists/MergeSortedSinglyLinkedListTest.java)
+            - 📄 [MiddleOfLinkedListTest](src/test/java/com/thealgorithms/datastructures/lists/MiddleOfLinkedListTest.java)
             - 📄 [QuickSortLinkedListTest](src/test/java/com/thealgorithms/datastructures/lists/QuickSortLinkedListTest.java)
             - 📄 [ReverseKGroupTest](src/test/java/com/thealgorithms/datastructures/lists/ReverseKGroupTest.java)
             - 📄 [RotateSinglyLinkedListsTest](src/test/java/com/thealgorithms/datastructures/lists/RotateSinglyLinkedListsTest.java)
@@ -1232,6 +1247,7 @@
           - 📄 [AutoCorrelationTest](src/test/java/com/thealgorithms/maths/AutoCorrelationTest.java)
           - 📄 [AutomorphicNumberTest](src/test/java/com/thealgorithms/maths/AutomorphicNumberTest.java)
           - 📄 [AverageTest](src/test/java/com/thealgorithms/maths/AverageTest.java)
+          - 📄 [BellNumbersTest](src/test/java/com/thealgorithms/maths/BellNumbersTest.java)
           - 📄 [BinaryPowTest](src/test/java/com/thealgorithms/maths/BinaryPowTest.java)
           - 📄 [BinomialCoefficientTest](src/test/java/com/thealgorithms/maths/BinomialCoefficientTest.java)
           - 📄 [CatalanNumbersTest](src/test/java/com/thealgorithms/maths/CatalanNumbersTest.java)
@@ -1245,6 +1261,7 @@
           - 📄 [CrossCorrelationTest](src/test/java/com/thealgorithms/maths/CrossCorrelationTest.java)
           - 📄 [DeterminantOfMatrixTest](src/test/java/com/thealgorithms/maths/DeterminantOfMatrixTest.java)
           - 📄 [DigitalRootTest](src/test/java/com/thealgorithms/maths/DigitalRootTest.java)
+          - 📄 [DistanceBetweenTwoPointsTest](src/test/java/com/thealgorithms/maths/DistanceBetweenTwoPointsTest.java)
           - 📄 [DistanceFormulaTest](src/test/java/com/thealgorithms/maths/DistanceFormulaTest.java)
           - 📄 [DudeneyNumberTest](src/test/java/com/thealgorithms/maths/DudeneyNumberTest.java)
           - 📄 [EulerMethodTest](src/test/java/com/thealgorithms/maths/EulerMethodTest.java)
@@ -1408,6 +1425,11 @@
           - 📄 [SimplePendulumRK4Test](src/test/java/com/thealgorithms/physics/SimplePendulumRK4Test.java)
           - 📄 [SnellLawTest](src/test/java/com/thealgorithms/physics/SnellLawTest.java)
           - 📄 [ThinLensTest](src/test/java/com/thealgorithms/physics/ThinLensTest.java)
+        - 📁 **prefixsum**
+          - 📄 [DifferenceArrayTest](src/test/java/com/thealgorithms/prefixsum/DifferenceArrayTest.java)
+          - 📄 [PrefixSum2DTest](src/test/java/com/thealgorithms/prefixsum/PrefixSum2DTest.java)
+          - 📄 [PrefixSumTest](src/test/java/com/thealgorithms/prefixsum/PrefixSumTest.java)
+          - 📄 [SubarraySumEqualskTest](src/test/java/com/thealgorithms/prefixsum/SubarraySumEqualskTest.java)
         - 📁 **puzzlesandgames**
           - 📄 [TowerOfHanoiTest](src/test/java/com/thealgorithms/puzzlesandgames/TowerOfHanoiTest.java)
           - 📄 [WordBoggleTest](src/test/java/com/thealgorithms/puzzlesandgames/WordBoggleTest.java)
@@ -1474,6 +1496,7 @@
           - 📄 [RabinKarpAlgorithmTest](src/test/java/com/thealgorithms/searches/RabinKarpAlgorithmTest.java)
           - 📄 [RandomSearchTest](src/test/java/com/thealgorithms/searches/RandomSearchTest.java)
           - 📄 [RecursiveBinarySearchTest](src/test/java/com/thealgorithms/searches/RecursiveBinarySearchTest.java)
+          - 📄 [RotatedBinarySearchTest](src/test/java/com/thealgorithms/searches/RotatedBinarySearchTest.java)
           - 📄 [RowColumnWiseSorted2dArrayBinarySearchTest](src/test/java/com/thealgorithms/searches/RowColumnWiseSorted2dArrayBinarySearchTest.java)
           - 📄 [SaddlebackSearchTest](src/test/java/com/thealgorithms/searches/SaddlebackSearchTest.java)
           - 📄 [SearchInARowAndColWiseSortedMatrixTest](src/test/java/com/thealgorithms/searches/SearchInARowAndColWiseSortedMatrixTest.java)
@@ -1484,6 +1507,7 @@
           - 📄 [UnionFindTest](src/test/java/com/thealgorithms/searches/UnionFindTest.java)
           - 📄 [UpperBoundTest](src/test/java/com/thealgorithms/searches/UpperBoundTest.java)
         - 📁 **slidingwindow**
+          - 📄 [CountNiceSubarraysTest](src/test/java/com/thealgorithms/slidingwindow/CountNiceSubarraysTest.java)
           - 📄 [LongestSubarrayWithSumLessOrEqualToKTest](src/test/java/com/thealgorithms/slidingwindow/LongestSubarrayWithSumLessOrEqualToKTest.java)
           - 📄 [LongestSubstringWithoutRepeatingCharactersTest](src/test/java/com/thealgorithms/slidingwindow/LongestSubstringWithoutRepeatingCharactersTest.java)
           - 📄 [MaxSumKSizeSubarrayTest](src/test/java/com/thealgorithms/slidingwindow/MaxSumKSizeSubarrayTest.java)
@@ -1528,6 +1552,7 @@
           - 📄 [SelectionSortTest](src/test/java/com/thealgorithms/sorts/SelectionSortTest.java)
           - 📄 [ShellSortTest](src/test/java/com/thealgorithms/sorts/ShellSortTest.java)
           - 📄 [SlowSortTest](src/test/java/com/thealgorithms/sorts/SlowSortTest.java)
+          - 📄 [SmoothSortTest](src/test/java/com/thealgorithms/sorts/SmoothSortTest.java)
           - 📄 [SortUtilsRandomGeneratorTest](src/test/java/com/thealgorithms/sorts/SortUtilsRandomGeneratorTest.java)
           - 📄 [SortUtilsTest](src/test/java/com/thealgorithms/sorts/SortUtilsTest.java)
           - 📄 [SortingAlgorithmTest](src/test/java/com/thealgorithms/sorts/SortingAlgorithmTest.java)
@@ -1538,6 +1563,7 @@
           - 📄 [SwapSortTest](src/test/java/com/thealgorithms/sorts/SwapSortTest.java)
           - 📄 [TimSortTest](src/test/java/com/thealgorithms/sorts/TimSortTest.java)
           - 📄 [TopologicalSortTest](src/test/java/com/thealgorithms/sorts/TopologicalSortTest.java)
+          - 📄 [TournamentSortTest](src/test/java/com/thealgorithms/sorts/TournamentSortTest.java)
           - 📄 [TreeSortTest](src/test/java/com/thealgorithms/sorts/TreeSortTest.java)
           - 📄 [WaveSortTest](src/test/java/com/thealgorithms/sorts/WaveSortTest.java)
           - 📄 [WiggleSortTest](src/test/java/com/thealgorithms/sorts/WiggleSortTest.java)
@@ -1578,6 +1604,7 @@
           - 📄 [HorspoolSearchTest](src/test/java/com/thealgorithms/strings/HorspoolSearchTest.java)
           - 📄 [IsogramTest](src/test/java/com/thealgorithms/strings/IsogramTest.java)
           - 📄 [IsomorphicTest](src/test/java/com/thealgorithms/strings/IsomorphicTest.java)
+          - 📄 [KMPTest](src/test/java/com/thealgorithms/strings/KMPTest.java)
           - 📄 [LengthOfLastWordTest](src/test/java/com/thealgorithms/strings/LengthOfLastWordTest.java)
           - 📄 [LetterCombinationsOfPhoneNumberTest](src/test/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumberTest.java)
           - 📄 [LongestCommonPrefixTest](src/test/java/com/thealgorithms/strings/LongestCommonPrefixTest.java)
@@ -1588,6 +1615,7 @@
           - 📄 [PalindromeTest](src/test/java/com/thealgorithms/strings/PalindromeTest.java)
           - 📄 [PangramTest](src/test/java/com/thealgorithms/strings/PangramTest.java)
           - 📄 [PermuteStringTest](src/test/java/com/thealgorithms/strings/PermuteStringTest.java)
+          - 📄 [RabinKarpTest](src/test/java/com/thealgorithms/strings/RabinKarpTest.java)
           - 📄 [RemoveDuplicateFromStringTest](src/test/java/com/thealgorithms/strings/RemoveDuplicateFromStringTest.java)
           - 📄 [ReturnSubsequenceTest](src/test/java/com/thealgorithms/strings/ReturnSubsequenceTest.java)
           - 📄 [ReverseStringTest](src/test/java/com/thealgorithms/strings/ReverseStringTest.java)