Update DIRECTORY.md (#6469)

DenizAltunkapan · web-flow · commit b0d7c06314ab · 2025-08-15T20:32:28.000+02:00
Co-authored-by: DenizAltunkapan &lt;DenizAltunkapan@users.noreply.github.com&gt;
diff --git a/DIRECTORY.md b/DIRECTORY.md
@@ -347,6 +347,7 @@
         - 📁 **graph**
           - 📄 [ConstrainedShortestPath](src/main/java/com/thealgorithms/graph/ConstrainedShortestPath.java)
           - 📄 [HopcroftKarp](src/main/java/com/thealgorithms/graph/HopcroftKarp.java)
+          - 📄 [PredecessorConstrainedDfs](src/main/java/com/thealgorithms/graph/PredecessorConstrainedDfs.java)
           - 📄 [StronglyConnectedComponentOptimized](src/main/java/com/thealgorithms/graph/StronglyConnectedComponentOptimized.java)
           - 📄 [TravelingSalesman](src/main/java/com/thealgorithms/graph/TravelingSalesman.java)
         - 📁 **greedyalgorithms**
@@ -1053,6 +1054,7 @@
         - 📁 **graph**
           - 📄 [ConstrainedShortestPathTest](src/test/java/com/thealgorithms/graph/ConstrainedShortestPathTest.java)
           - 📄 [HopcroftKarpTest](src/test/java/com/thealgorithms/graph/HopcroftKarpTest.java)
+          - 📄 [PredecessorConstrainedDfsTest](src/test/java/com/thealgorithms/graph/PredecessorConstrainedDfsTest.java)
           - 📄 [StronglyConnectedComponentOptimizedTest](src/test/java/com/thealgorithms/graph/StronglyConnectedComponentOptimizedTest.java)
           - 📄 [TravelingSalesmanTest](src/test/java/com/thealgorithms/graph/TravelingSalesmanTest.java)
         - 📁 **greedyalgorithms**
