Depth First Search Traversal

depth_first_search.cpp

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+//c++ program for Depth First Search traversal
+#include <iostream>
+#include <vector>
+using namespace std;
+
+vector <int> adj[100];			
+
+bool visited[100];					//Initialising the visited vector
+
+void dfs(int s) {			
+        visited[s] = true;
+
+		cout<<s<<" ";			        //Printing node
+	for(int i = 0;i < adj[s].size();++i){	        //If the nodes are unvisited then we visit the neighbouring node		
+		if(visited[adj[s][i]] == false)	
+			dfs(adj[s][i]);		
+
+        }
+}
+
+void initialize() {					//Initialize all nodes as not visited
+        for(int i = 0;i < 100;++i)
+         visited[i] = false;
+}
+
+int main() {
+        int nodes, edges, x, y;
+	cout << "Enter the number of nodes\n" ;
+        cin >> nodes;                       		//Number of nodes
+	cout << "Enter the number of edges\n" ;
+        cin >> edges;                       		//Number of edges
+        for(int i = 0;i < edges;++i) {
+        	 cin >> x >> y;    			//Undirected Graph 
+         	adj[x].push_back(y);                    //Edge from vertex x to vertex y
+         	adj[y].push_back(x);                    //Edge from vertex y to vertex x
+        }
+
+        initialize();                           	//Initialize all nodes as not visited
+
+	cout<<"Nodes are visited in the order\n";
+        for(int i = 1;i <= nodes;++i) {
+         if(visited[i] == false)     {
+             dfs(i);
+         }
+}
+
+        return 0;
+    }