#include<bits/stdc++.h>
using namespace std;
class graph
{
int v;
list<int> *adj;
public:
graph(int v)
{
this->v=v;
adj=new list<int>[v];
}
void add_edge(int v,int w)
{
adj[v].push_back(w);
}
void dfs(int v);
void dfsSearch(int v,bool visited[]);
};
void graph:: dfsSearch(int start,bool visited[])
{
visited[start]=true;
cout<<start<<" ";
for(auto itr=adj[start].begin();itr!=adj[start].end();itr++)
{
if (!visited[*itr])
{
dfsSearch(*itr,visited);
}
}
}
void graph:: dfs(int start)
{
bool *visited=new bool[v];
for(int i=0;i<v;i++)
visited[i]=false;
dfsSearch(start,visited);
}
int main()
{
int v;
cout<<"Enter the number of vertices"<<endl;
cin>>v;
graph g(v);
while(1)
{
int x,y;
cout<<"Enter the nodes"<<endl;
cin>>x>>y;
g.add_edge(x,y);
cout<<"Enter -1 to exit"<<endl;
int t;
cin>>t;
if(t==-1)
break;
}
cout<<"Enter the starting node"<<endl;
int t;
cin>>t;
g.dfs(t);
return 0;
}
using namespace std;
class graph
{
int v;
list<int> *adj;
public:
graph(int v)
{
this->v=v;
adj=new list<int>[v];
}
void add_edge(int v,int w)
{
adj[v].push_back(w);
}
void dfs(int v);
void dfsSearch(int v,bool visited[]);
};
void graph:: dfsSearch(int start,bool visited[])
{
visited[start]=true;
cout<<start<<" ";
for(auto itr=adj[start].begin();itr!=adj[start].end();itr++)
{
if (!visited[*itr])
{
dfsSearch(*itr,visited);
}
}
}
void graph:: dfs(int start)
{
bool *visited=new bool[v];
for(int i=0;i<v;i++)
visited[i]=false;
dfsSearch(start,visited);
}
int main()
{
int v;
cout<<"Enter the number of vertices"<<endl;
cin>>v;
graph g(v);
while(1)
{
int x,y;
cout<<"Enter the nodes"<<endl;
cin>>x>>y;
g.add_edge(x,y);
cout<<"Enter -1 to exit"<<endl;
int t;
cin>>t;
if(t==-1)
break;
}
cout<<"Enter the starting node"<<endl;
int t;
cin>>t;
g.dfs(t);
return 0;
}
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