Implemented Disjoint Set (Union-Find) Data Structure (#160)

* Added Disjoint Sets Data structure * Moved DisjointSetTest.php to tests/DataStructures * Update DataStructures/DisjointSets/DisjointSet.php Co-authored-by: Brandon Johnson <bbj1979@gmail.com> * Update DataStructures/DisjointSets/DisjointSetNode.php Co-authored-by: Brandon Johnson <bbj1979@gmail.com> * Update DataStructures/DisjointSets/DisjointSetNode.php Co-authored-by: Brandon Johnson <bbj1979@gmail.com> * Update tests/DataStructures/DisjointSetTest.php Co-authored-by: Brandon Johnson <bbj1979@gmail.com> * Update tests/DataStructures/DisjointSetTest.php Co-authored-by: Brandon Johnson <bbj1979@gmail.com> * Update tests/DataStructures/DisjointSetTest.php Co-authored-by: Brandon Johnson <bbj1979@gmail.com> * Considered PHPCS remarks. Unit Testing is now working. * Remove data type mixed. Considered annotations for php7.4. * Remove data type mixed. Considered annotations for php7.4. * updating DIRECTORY.md --------- Co-authored-by: Brandon Johnson <bbj1979@gmail.com> Co-authored-by: Ramy-Badr-Ahmed <Ramy-Badr-Ahmed@users.noreply.github.com>
2025-07-25 19:01:16 +02:00 · 2024-09-13 16:06:44 +02:00
parent 9a80c3afd3
commit 193d032f20
5 changed files with 155 additions and 1 deletions
--- a/tests/DataStructures/DisjointSetTest.php
+++ b/tests/DataStructures/DisjointSetTest.php
@@ -0,0 +1,87 @@
+<?php
+
+namespace DataStructures;
+
+require_once __DIR__ . '/../../DataStructures/DisjointSets/DisjointSet.php';
+require_once __DIR__ . '/../../DataStructures/DisjointSets/DisjointSetNode.php';
+
+use DataStructures\DisjointSets\DisjointSet;
+use DataStructures\DisjointSets\DisjointSetNode;
+use PHPUnit\Framework\TestCase;
+
+class DisjointSetTest extends TestCase
+{
+    private DisjointSet $ds;
+    private array $nodes;
+
+    protected function setUp(): void
+    {
+        $this->ds = new DisjointSet();
+        $this->nodes = [];
+
+        // Create 20 nodes
+        for ($i = 0; $i < 20; $i++) {
+            $this->nodes[$i] = new DisjointSetNode($i);
+        }
+
+        // Perform union operations to form several disjoint sets
+        $this->ds->unionSet($this->nodes[0], $this->nodes[1]);
+        $this->ds->unionSet($this->nodes[1], $this->nodes[2]);
+
+        $this->ds->unionSet($this->nodes[3], $this->nodes[4]);
+        $this->ds->unionSet($this->nodes[4], $this->nodes[5]);
+
+        $this->ds->unionSet($this->nodes[6], $this->nodes[7]);
+        $this->ds->unionSet($this->nodes[7], $this->nodes[8]);
+
+        $this->ds->unionSet($this->nodes[9], $this->nodes[10]);
+        $this->ds->unionSet($this->nodes[10], $this->nodes[11]);
+
+        $this->ds->unionSet($this->nodes[12], $this->nodes[13]);
+        $this->ds->unionSet($this->nodes[13], $this->nodes[14]);
+
+        $this->ds->unionSet($this->nodes[15], $this->nodes[16]);
+        $this->ds->unionSet($this->nodes[16], $this->nodes[17]);
+
+        $this->ds->unionSet($this->nodes[18], $this->nodes[19]);
+    }
+
+    public function testFindSet(): void
+    {
+        // Nodes in the same sets should have the same root
+        for ($i = 0; $i < 6; $i++) {
+            for ($j = 0; $j < 6; $j++) {
+                $setI = $this->ds->findSet($this->nodes[$i]);
+                $setJ = $this->ds->findSet($this->nodes[$j]);
+
+                if ($this->inSameSet($i, $j)) {
+                    $this->assertSame($setI, $setJ, "Nodes $i and $j should be in the same set");
+                } else {
+                    $this->assertNotSame($setI, $setJ, "Nodes $i and $j should be in different sets");
+                }
+            }
+        }
+    }
+
+    private function inSameSet(int $i, int $j): bool
+    {
+        // Define which nodes should be in the same set based on union operations
+        $sets = [
+            [0, 1, 2],      // Set A
+            [3, 4, 5],      // Set B
+            [6, 7, 8],      // Set C
+            [9, 10, 11],    // Set D
+            [12, 13, 14],   // Set E
+            [15, 16, 17],   // Set F
+            [18, 19]        // Set G
+        ];
+
+        foreach ($sets as $set) {
+            if (in_array($i, $set) && in_array($j, $set)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}