updating DIRECTORY.md

pluto0327 · May 10, 2021 · 0631081 · 0631081
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 # List of all files
 
 ## Data Structures
+  * Heap
+    * [Heap](https://github.com/TheAlgorithms/Swift/blob/master/data_structures/heap/heap.swift)
   * Linked List
     * [Linkedlist](https://github.com/TheAlgorithms/Swift/blob/master/data_structures/Linked%20List/LinkedList.swift)
   * Queue
     * [Queue](https://github.com/TheAlgorithms/Swift/blob/master/data_structures/queue/queue.swift)
   * Stack
     * [Stack](https://github.com/TheAlgorithms/Swift/blob/master/data_structures/Stack/stack.swift)
+  * Union Find
+    * [Union Find](https://github.com/TheAlgorithms/Swift/blob/master/data_structures/union_find/union_find.swift)
+
+## Graph
+  * Spanning Tree
+    * [Kruskal](https://github.com/TheAlgorithms/Swift/blob/master/graph/spanning_tree/kruskal.swift)
 
 ## Recursion
   * [Fibonacci](https://github.com/TheAlgorithms/Swift/blob/master/recursion/fibonacci.swift)