Topological graph sort

Topological Graph Sort

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+
+// A C++ program to print topological sorting of a DAG 
+
+#include<iostream> 
+
+#include <list> 
+
+#include <stack> 
+
+using namespace std; 
+class Graph 
+{
+    int V;    // No. of vertices' 
+    list<int> *adj; 
+    void topologicalSortUtil(int v, bool visited[], stack<int> &Stack); 
+public: 
+
+    Graph(int V);   // Constructor
+
+    void addEdge(int v, int w); 
+
+    void topologicalSort(); 
+
+}; 
+
+
+
+Graph::Graph(int V) 
+
+{ 
+
+    this->V = V; 
+
+    adj = new list<int>[V]; 
+
+} 
+
+
+
+void Graph::addEdge(int v, int w) 
+
+{ 
+
+    adj[v].push_back(w); // Add w to v’s list. 
+
+} 
+
+
+void Graph::topologicalSortUtil(int v, bool visited[],  
+
+                                stack<int> &Stack) 
+
+{ 
+
+
+    visited[v] = true; 
+    list<int>::iterator i; 
+
+    for (i = adj[v].begin(); i != adj[v].end(); ++i) 
+
+        if (!visited[*i]) 
+
+            topologicalSortUtil(*i, visited, Stack); 
+
+
+    Stack.push(v); 
+
+} 
+
+
+
+
+// topologicalSortUtil() 
+
+void Graph::topologicalSort() 
+
+{ 
+
+    stack<int> Stack; 
+
+
+
+
+    bool *visited = new bool[V]; 
+
+    for (int i = 0; i < V; i++) 
+
+        visited[i] = false; 
+
+
+    for (int i = 0; i < V; i++) 
+
+      if (visited[i] == false) 
+
+        topologicalSortUtil(i, visited, Stack); 
+
+
+    while (Stack.empty() == false) 
+
+    { 
+
+        cout << Stack.top() << " "; 
+
+        Stack.pop(); 
+
+    } 
+
+} 
+
+
+int main() 
+
+{ 
+
+    // Create a graph given in the above diagram 
+
+    Graph g(6); 
+
+    g.addEdge(5, 2); 
+
+    g.addEdge(5, 0); 
+
+    g.addEdge(4, 0); 
+
+    g.addEdge(4, 1); 
+
+    g.addEdge(2, 3); 
+
+    g.addEdge(3, 1); 
+
+
+
+    cout << "Following is a Topological Sort of the given graph \n"; 
+
+    g.topologicalSort(); 
+
+
+
+    return 0; 
+
+} 
+
+