Created find-MotherVertex.cpp

Graph/find-MotherVertex.cpp

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+//code for finding mother vertex in the given graph
+
+/*
+    ->mother vertex is the vertex from which all other vertex can be visited.
+    ->now if the vertex is mother vertex then it's finished time will be maximum..
+    ->there may be more than one mother vertex.
+
+*/
+
+#include<bits/stdc++.h>
+using namespace std;
+
+class Graph
+{
+  long long int V;
+  //No of vertices
+
+  // Adjacency list of the given graph
+  vector< vector<long long int> > adj;
+
+  //constructor
+  Graph(long long int V)
+  {
+      adj.assign(V, vector<long long int>());
+  }
+
+  void addEdge(long long int v,long long int u);
+
+  long long int findMotherVertex();
+  void DFS(long long int src,vector<bool> &visited);
+};
+
+void Graph::addEdge(long long int v,long long int u)
+{
+    //function for adding an edge between vertex v and vertex u 
+    adj[v].push_back(u);
+}
+
+long long int Graph::findMotherVertex()
+{
+    vector<bool> visited(V,false);
+
+    //store motheVertex in a variable
+    long long int motherVertex;
+
+    for(long long int i=1;i<=V;i++)
+    {
+        if(!visited[i])
+        {
+            DFS(i,visited);
+            motherVertex = i;
+        }
+    }
+
+    return motherVertex;
+}
+
+void Graph::DFS(long long int src,vector<bool> &visited)
+{
+    //mark the given vertex as visited
+    visited[src]=true;
+
+    // iterate over adjancent vertexes of the given vertex
+    for(auto x:adj[src])
+    {
+        // If the vertex is not visited then run DFS from that vertex
+        if(!visited[x])
+        {
+            DFS(x,visited);
+        }
+    }
+}