Update DIRECTORY.md

Author: DenizAltunkapan

DIRECTORY.md

@@ -716,6 +716,7 @@
           - 📄 [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)
@@ -761,6 +762,7 @@
           - 📄 [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)
@@ -1495,6 +1497,7 @@
           - 📄 [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)
@@ -1539,6 +1542,7 @@
           - 📄 [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)