Merge pull request #442 from Gargi14/main

BFSDFS.cpp

Programs in different languages/bfsdfs.cpp

@@ -0,0 +1,152 @@
+#include<iostream>
+#include<vector>
+#include<queue>
+using namespace std;
+
+vector<vector<int>>graph;
+vector<bool>visited;
+
+void dfs(int v){
+    visited[v]=true;
+    cout<<v<<" ";
+
+    for(int i=0;i<graph[v].size();++i)
+    {
+        int u=graph[v][i];
+        if(!visited[u])
+        {
+            dfs(u);
+        }
+    }
+}
+
+void bfs(int v){
+    queue<int>q;
+    q.push(v);
+    visited[v]=true;
+
+    while(!q.empty())
+    {
+        int curr=q.front();
+        q.pop();
+        cout<<curr<<" ";
+
+        for(int i=0;i<graph[curr].size();++i){
+            int u=graph[curr][i];
+            if(!visited[u])
+            {
+                visited[u]=true;
+                q.push(u);
+            }
+        }
+    }
+
+}
+
+int bfsSearch(int n,int v,int x)
+{
+    queue<int>q;
+    visited[v]=true;
+    q.push(v);
+
+    while(!q.empty())
+    {
+        int curr=q.front();
+        q.pop();
+
+        for(int i=0;i<graph[curr].size();++i){
+            int u=graph[curr][i];
+            if(!visited[u])
+            {
+                visited[u]=true;
+                q.push(u);
+            }
+        }
+        cout<<curr<<" ";
+        if(curr==x)
+        {
+            cout<<"Node is Found";
+            return 1;
+        }
+    }
+return 0;
+
+}
+
+int main(){
+    int n,m;
+    cout<<"Enter number of Vertices: ";
+    cin>>n;
+    cout<<"Enter number of edges: ";
+    cin>>m;
+
+    graph.resize(n);
+    visited.resize(n,false);
+
+    for(int i=0;i<m;++i){
+        int u,v;
+        cout<<"Enter an Edge(u v): ";
+        cin>>u>>v;
+        graph[u].push_back(v);
+        graph[v].push_back(u);
+    }
+
+    while(true)
+    {
+        cout<<"***************************\n";
+        cout<<"1.DFS\n";
+        cout<<"2.BFS\n";
+        cout<<"3.Search\n";
+        cout<<"4.Quit\n";
+
+        int ch;
+        cout<<"Enter Your Choice\n";
+        cin>>ch;
+
+        switch(ch)
+        {
+            case 1:
+                cout<<"DEPTH FIRST SEARCH: ";
+                for(int i=0;i<n;++i)
+                {
+                    if(!visited[i])
+                    {
+                        dfs(i);
+                    }
+                }
+                break;
+            case 2:
+                visited.clear();
+                visited.resize(n,false);
+                cout<<"BREADTH FIRST SEARCH: ";
+                for(int i=0;i<n;++i)
+                {
+                    if(!visited[i])
+                    {
+                        bfs(i);
+                    }
+                }
+                break;
+            case 3:
+                visited.clear();
+                visited.resize(n,false);
+                int x;
+                cout<<"Enter no:\n";
+                cin>>x;
+                int y;
+                cout<<"SEARCH\n";
+                y=bfsSearch(n,0,x);
+                if(y==0)
+                {
+                    cout<<"NODE NOT FOUND";
+                }
+                break;
+
+            default:
+                cout<<"Thank you for using this program!!";
+                break;
+
+        }
+    }
+    return 0;
+}