#include  using namespace std; // Function to perform DFS and topological sorting void topologicalSortUtil(int v, vector >& adj, vektor & besøgt, stak & Stack) { // Marker den aktuelle node som besøgt besøgt[v] = sand;  // Gentag for alle tilstødende hjørner for (int i : adj[v]) { if (!besøgt[i]) topologiskSortUtil(i, adj, besøgt, stak);  } // Skub nuværende toppunkt til stak, som gemmer resultatet Stack.push(v); } // Funktion til at udføre Topologisk Sortering void topologicalSort(vector >& adj, int V) { stak Stak; // Stak for at gemme resultatvektoren besøgt(V, falsk);  // Kald den rekursive hjælpefunktion for at gemme // Topologisk sortering startende fra alle hjørner en efter // en for (int i = 0; i < V; i++) {  if (!visited[i])  topologicalSortUtil(i, adj, visited, Stack);  }  // Print contents of stack  while (!Stack.empty()) {  cout  < < Stack.top()  < < ' ';  Stack.pop();  } } int main() {  // Number of nodes  int V = 4;  // Edges  vector > kanter = { { 0, 1 }, { 1, 2 }, { 3, 1 }, { 3, 2 } };  // Graf repræsenteret som en nabolistevektor > adj(V);  for (auto i : kanter) { adj[i[0]].push_back(i[1]);  } cout < < 'Topological sorting of the graph: ';  topologicalSort(adj, V);  return 0; } 

import java.util.*; public class TopologicalSort {  // Function to perform DFS and topological sorting  static void  topologicalSortUtil(int v, List > adj, boolean[] besøgt, stak stack) { // Marker den aktuelle node som besøgt besøgt[v] = sand;  // Gentag for alle tilstødende hjørner for (int i : adj.get(v)) { if (!besøgt[i]) topologiskSortUtil(i, adj, besøgt, stak);  } // Skub det aktuelle toppunkt til stakken, som gemmer // resultatet stack.push(v);  } // Funktion til at udføre Topologisk Sort statisk tomrum topologiskSort(List > adj, int V) { // Stak for at gemme resultatet Stak stak = ny stak();  boolean[] visited = new boolean[V];  // Kald den rekursive hjælpefunktion for at gemme // Topologisk sortering startende fra alle hjørner en // efter en for (int i = 0; i < V; i++) {  if (!visited[i])  topologicalSortUtil(i, adj, visited, stack);  }  // Print contents of stack  System.out.print(  'Topological sorting of the graph: ');  while (!stack.empty()) {  System.out.print(stack.pop() + ' ');  }  }  // Driver code  public static void main(String[] args)  {  // Number of nodes  int V = 4;  // Edges  List > edges = new ArrayList();  edges.add(Arrays.asList(0, 1));  edges.add(Arrays.asList(1, 2));  edges.add(Arrays.asList(3, 1));  edges.add(Arrays.asList(3, 2));  // Graf repræsenteret som en tilstødende liste Liste > adj = ny ArrayList(V);  for (int i = 0; i < V; i++) {  adj.add(new ArrayList());  }  for (List i : edges) { adj.get(i.get(0)).add(i.get(1));  } topologiskSort(adj, V);  } } 

def topologicalSortUtil(v, adj, visited, stack): # Mark the current node as visited visited[v] = True # Recur for all adjacent vertices for i in adj[v]: if not visited[i]: topologicalSortUtil(i, adj, visited, stack) # Push current vertex to stack which stores the result stack.append(v) # Function to perform Topological Sort def topologicalSort(adj, V): # Stack to store the result stack = [] visited = [False] * V # Call the recursive helper function to store # Topological Sort starting from all vertices one by # one for i in range(V): if not visited[i]: topologicalSortUtil(i, adj, visited, stack) # Print contents of stack print('Topological sorting of the graph:', end=' ') while stack: print(stack.pop(), end=' ') # Driver code if __name__ == '__main__': # Number of nodes V = 4 # Edges edges = [[0, 1], [1, 2], [3, 1], [3, 2]] # Graph represented as an adjacency list adj = [[] for _ in range(V)] for i in edges: adj[i[0]].append(i[1]) topologicalSort(adj, V) 

using System; using System.Collections.Generic; class Program {  // Function to perform DFS and topological sorting  static void TopologicalSortUtil(int v,  List > adj, bool[] besøgt, stak stack) { // Marker den aktuelle node som besøgt besøgt[v] = sand;  // Gentages for alle tilstødende hjørner foreach(int i i adj[v]) { if (!besøgt[i]) TopologiskSortUtil(i, adj, besøgt, stak);  } // Skub det aktuelle toppunkt til stakken, som gemmer // resultatstakken. Push(v);  } // Funktion til at udføre Topologisk Sort statisk tomrum TopologiskSort(List > adj, int V) { // Stak for at gemme resultatet Stak stak = ny stak ();  bool[] besøgt = ny bool[V];  // Kald den rekursive hjælpefunktion for at gemme // Topologisk sortering startende fra alle hjørner en // efter en for (int i = 0; i < V; i++) {  if (!visited[i])  TopologicalSortUtil(i, adj, visited, stack);  }  // Print contents of stack  Console.Write('Topological sorting of the graph: ');  while (stack.Count>0) { Console.Write(stack.Pop() + ' ');  } } // Driverkode static void Main(string[] args) { // Antal noder int V = 4;  // Kantliste > kanter = ny liste >{ ny liste { 0, 1 }, ny liste { 1, 2 }, ny liste { 3, 1 }, ny liste { 3, 2 } };  // Graf repræsenteret som en tilstødende liste Liste > adj = ny liste >();  for (int i = 0; i < V; i++) {  adj.Add(new List ());  } foreach(Liste i i kanter) { adj[i[0]].Add(i[1]);  } TopologiskSort(adj, V);  } } 

// Function to perform DFS and topological sorting function topologicalSortUtil(v, adj, visited, stack) {  // Mark the current node as visited  visited[v] = true;  // Recur for all adjacent vertices  for (let i of adj[v]) {  if (!visited[i])  topologicalSortUtil(i, adj, visited, stack);  }  // Push current vertex to stack which stores the result  stack.push(v); } // Function to perform Topological Sort function topologicalSort(adj, V) {  // Stack to store the result  let stack = [];  let visited = new Array(V).fill(false);  // Call the recursive helper function to store  // Topological Sort starting from all vertices one by  // one  for (let i = 0; i  < V; i++) {  if (!visited[i])  topologicalSortUtil(i, adj, visited, stack);  }  // Print contents of stack  console.log('Topological sorting of the graph: ');  while (stack.length>0) { console.log(stack.pop() + ' ');  } } // Driverkode (() => { // Antal noder const V = 4; // Edges const edges = [[0, 1], [1, 2], [3, 1], [3, 2]]; // Graf repræsenteret som en adjacency liste const adj = Array.from({ length: V }, () => [] for (lad i af kanter) { adj[i[0]] (i[1]); } topologicalSort(adj, V })(); 

#include  #include  #include  using namespace std; // Class to represent a graph class Graph {  int V; // No. of vertices  list * adj; // Pointer til et array, der indeholder // adjacency lists public: Graph(int V); // Konstruktør void addEdge(int v, int w); // Funktion til at tilføje en kant til grafen void topologicalSort(); // udskriver en topologisk sort af // hele grafen }; Graph::Graph(int V) { this->V = V;  adj = ny liste [V]; } void Graph::addEdge(int v, int w) { adj[v].push_back(w); // Tilføj w til vs liste. } // Funktion til at udføre Topological Sort void Graph::topologicalSort() { // Opret en vektor til at gemme i-grad af alle toppunkter vektor in_degree(V, 0);  // Gå gennem tilgrænsende lister for at udfylde_grad af // hjørnepunkter for (int v = 0; v < V; ++v) {  for (auto const& w : adj[v])  in_degree[w]++;  }  // Create a queue and enqueue all vertices with  // in-degree 0  queue q;  for (int i = 0; i < V; ++i) {  if (in_degree[i] == 0)  q.push(i);  }  // Initialize count of visited vertices  int count = 0;  // Create a vector to store topological order  vector top_ordre;  // En efter en dequeue vertices from queue and enqueue // adjacent vertices if in-degree of adjacent bliver 0 mens (!q.empty()) { // Udtræk foran i køen (eller udfør dequeue) // og føj det til topologisk rækkefølge int u = q.front();  q.pop();  top_order.push_back(u);  // Iterer gennem alle dens tilstødende noder // af udeladt node u og sænk deres in-grad // med 1 liste ::iterator itr;  for (itr = adj[u].begin(); itr != adj[u].end(); ++itr) // Hvis in-degree bliver nul, føj det til køen hvis (--in_degree[*itr) ] == 0) q.push(*itr);  tælle++;  } // Tjek om der var en cyklus hvis (tæl != V) { cout < < 'Graph contains cycle
';  return;  }  // Print topological order  for (int i : top_order)  cout  < < i  < < ' '; } // Driver code 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
';  g.topologicalSort();  return 0; } 

import java.util.ArrayList; import java.util.LinkedList; import java.util.Queue; // Class to represent a graph class Graph {  private int V; // No. of vertices  private ArrayList [] adj; // Adjacency list // repræsentation af // grafen // Constructor Graph(int V) { this.V = V;  adj = ny ArrayList[V];  for (int i = 0; i < V; ++i)  adj[i] = new ArrayList();  }  // Function to add an edge to the graph  void addEdge(int v, int w)  {  adj[v].add(w); // Add w to v’s list.  }  // Function to perform Topological Sort  void topologicalSort()  {  // Create an array to store in-degree of all  // vertices  int[] inDegree = new int[V];  // Calculate in-degree of each vertex  for (int v = 0; v  < V; ++v) {  for (int w : adj[v]) {  inDegree[w]++;  }  }  // Create a queue and enqueue all vertices with  // in-degree 0  Queue q = new LinkedList();  for (int i = 0; i < V; ++i) {  if (inDegree[i] == 0)  q.add(i);  }  // Initialize count of visited vertices  int count = 0;  // Create an ArrayList to store topological order  ArrayList topOrder = new ArrayList();  // En efter en dequeue vertices fra køen og // sæt tilstødende vertices, hvis in-degree af // adjacent bliver 0 mens (!q.isEmpty()) { // Udtræk forsiden af ​​køen og tilføj det til // topologisk rækkefølge int u = q.poll();  topOrder.add(u);  tælle++;  // Iterer gennem alle dens tilstødende noder af // dequeued node u og reducer deres in-degree // med 1 for (int w : adj[u]) { // Hvis in-degree bliver nul, føj det til // køen if (-inDegree[w] == 0) q.add(w);  } } // Tjek om der var en cyklus if (tæl != V) { System.out.println('Graf indeholder cyklus');  Vend tilbage;  } // Udskriv topologisk rækkefølge for (int i : topOrder) System.out.print(i + ' ');  } } // Driver code public class Main { public static void main(String[] args) { // Opret en graf givet i ovenstående diagram Graph g = new Graph(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);  System.out.println( 'Følgende er en topologisk sortering af den givne graf');  g.topologicalSort();  } } 

from collections import defaultdict class Graph: def __init__(self, vertices): # Number of vertices self.V = vertices # Dictionary to store adjacency lists self.adj = defaultdict(list) def addEdge(self, u, v): # Function to add an edge to the graph self.adj[u].append(v) def topologicalSort(self): # Function to perform Topological Sort # Create a list to store in-degree of all vertices in_degree = [0] * self.V # Traverse adjacency lists to fill in_degree of vertices for i in range(self.V): for j in self.adj[i]: in_degree[j] += 1 # Create a queue and enqueue all vertices with in-degree 0 q = [] for i in range(self.V): if in_degree[i] == 0: q.append(i) # Initialize count of visited vertices count = 0 # Create a list to store topological order top_order = [] # One by one dequeue vertices from queue and enqueue # adjacent vertices if in-degree of adjacent becomes 0 while q: # Extract front of queue (or perform dequeue) # and add it to topological order u = q.pop(0) top_order.append(u) # Iterate through all its neighbouring nodes # of dequeued node u and decrease their in-degree # by 1 for node in self.adj[u]: # If in-degree becomes zero, add it to queue in_degree[node] -= 1 if in_degree[node] == 0: q.append(node) count += 1 # Check if there was a cycle if count != self.V: print('Graph contains cycle') return # Print topological order print('Topological Sort:', top_order) # Driver code if __name__ == '__main__': # Create a graph given in the above diagram g = Graph(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) print('Following is a Topological Sort of the given graph') g.topologicalSort() 

// Class to represent a graph class Graph {  constructor(V) {  this.V = V; // No. of vertices  this.adj = new Array(V); // Array containing adjacency lists  for (let i = 0; i  < V; i++) {  this.adj[i] = [];  }  }  // Function to add an edge to the graph  addEdge(v, w) {  this.adj[v].push(w); // Add w to v’s list.  }  // Function to perform Topological Sort  topologicalSort() {  // Create a array to store in-degree of all vertices  let inDegree = new Array(this.V).fill(0);  // Traverse adjacency lists to fill inDegree of vertices  for (let v = 0; v  < this.V; v++) {  for (let w of this.adj[v]) {  inDegree[w]++;  }  }  // Create a queue and enqueue all vertices with in-degree 0  let queue = [];  for (let i = 0; i  < this.V; i++) {  if (inDegree[i] === 0) {  queue.push(i);  }  }  // Initialize count of visited vertices  let count = 0;  // Create an array to store topological order  let topOrder = [];  // One by one dequeue vertices from queue and enqueue  // adjacent vertices if in-degree of adjacent becomes 0  while (queue.length !== 0) {  // Extract front of queue and add it to topological order  let u = queue.shift();  topOrder.push(u);  // Iterate through all its neighboring nodes  // of dequeued node u and decrease their in-degree by 1  for (let w of this.adj[u]) {  // If in-degree becomes zero, add it to queue  if (--inDegree[w] === 0) {  queue.push(w);  }  }  count++;  }  // Check if there was a cycle  if (count !== this.V) {  console.log('Graph contains cycle');  return;  }  // Print topological order  console.log('Topological Sort of the given graph:');  console.log(topOrder.join(' '));  } } // Driver code // Create a graph given in the above diagram let g = new Graph(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); console.log('Following is a Topological Sort of the given graph:'); g.topologicalSort(); //This code is contributed by Utkarsh