Data update

Task/Tarjan/JavaScript/tarjan.js

@@ -0,0 +1,83 @@
+class Graph {
+    constructor(size) {
+        this.adjacencyLists = [];
+        this.vertices = [];
+        this.index = 0;
+        this.stack = [];
+        this.numbers = new Map();
+        this.lowlinks = new Map();
+        this.stronglyConnectedComponents = [];
+
+        for (let i = 0; i < size; i++) {
+            this.vertices.push(i);
+            this.adjacencyLists.push(new Set());
+        }
+    }
+
+    addDirectedEdge(from, to) {
+        this.adjacencyLists[from].add(to);
+    }
+
+    getSCC() {
+        for (const vertex of this.vertices) {
+            if (!this.numbers.has(vertex)) {
+                this.stronglyConnect(vertex);
+            }
+        }
+
+        return this.stronglyConnectedComponents;
+    }
+
+    stronglyConnect(vertex) {
+        this.numbers.set(vertex, this.index);
+        this.lowlinks.set(vertex, this.index);
+        this.index += 1;
+        this.stack.push(vertex);
+
+        for (const adjacent of this.adjacencyLists[vertex]) {
+            if (!this.numbers.has(adjacent)) {
+                this.stronglyConnect(adjacent);
+                this.lowlinks.set(vertex, Math.min(this.lowlinks.get(vertex), this.lowlinks.get(adjacent)));
+            } else if (this.stack.includes(adjacent)) {
+                this.lowlinks.set(vertex, Math.min(this.lowlinks.get(vertex), this.numbers.get(adjacent)));
+            }
+        }
+
+        if (this.lowlinks.get(vertex) === this.numbers.get(vertex)) {
+            const stronglyConnectedComponent = new Set();
+            let top;
+            do {
+                top = this.stack.pop();
+                stronglyConnectedComponent.add(top);
+            } while (top !== vertex);
+
+            this.stronglyConnectedComponents.push(stronglyConnectedComponent);
+        }
+    }
+}
+
+// Main function equivalent
+function main() {
+    const graph = new Graph(8);
+
+    graph.addDirectedEdge(0, 1);
+    graph.addDirectedEdge(1, 2);
+    graph.addDirectedEdge(1, 7);
+    graph.addDirectedEdge(2, 3);
+    graph.addDirectedEdge(2, 6);
+    graph.addDirectedEdge(3, 4);
+    graph.addDirectedEdge(4, 2);
+    graph.addDirectedEdge(4, 5);
+    graph.addDirectedEdge(6, 3);
+    graph.addDirectedEdge(6, 5);
+    graph.addDirectedEdge(7, 0);
+    graph.addDirectedEdge(7, 6);
+
+    console.log("The strongly connected components are: ");
+    for (const component of graph.getSCC()) {
+        console.log(component);
+    }
+}
+
+// Run the main function
+main();