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#include<iostream>
#include<vector>
#include<string>
#include<map>
#include<functional>
#include<cstdlib>
using namespace std;
struct vertex;
struct edge
{
vertex *dest;
double cost;
edge(vertex *a=NULL, double b=0)
{
dest=a;
cost=b;
}
};
struct vertex
{
string name;
vector<edge> adj;
vertex(string s)
{
name=s;
}
};
class graph
{
public:
typedef map<string, vertex *,less<string> > vmap;
vmap work;
void addvertex(const string&);
void viewvertex();
void addedge(const string& from, const string& to, double cost);
void viewcostofedge(const string &from, const string &to);
};
void graph::addvertex(const string &name)
{
vmap::iterator itr=work.begin();
itr=work.find(name);
if(itr==work.end())
{
vertex *v;
v= new vertex(name);
work[name]=v;
return;
}
cout<<"\nVertex already exists!";
}
void graph::viewvertex()
{
vmap::iterator itr=work.begin();
for(;itr!=work.end();itr++)
{
cout<<"\n"<<itr->first;
}
}
void graph::addedge(const string& from, const string& to, double cost)
{
vertex *f=(work.find(from)->second);
vertex *t=(work.find(to)->second);
edge added(t,cost);
f->adj.push_back(added);
}
void graph::viewcostofedge(const string &from, const string &to)
{
vmap::iterator itr=work.find(from);
vector<edge> v=(itr->second)->adj;
vector<edge>::iterator itr1=v.begin();
vertex *p;
for(;itr1!=v.end();itr1++)
{
if(((*itr1).dest)->name==to)
cout<<"\nThe cost is:-"<<(*itr1).cost;
}
}
int main()
{
int ch;
graph g;
string name;
string string1,string2;
double cost;
do
{
cout<<"\n\n\n1.Add Vertex\n2.View Vertex\n3.Add Edge\n4.View Cost\n5.Exit\nEnter choice:-\n\n\n";
cin>>ch;
switch(ch)
{
case 1:
cout<<"\nEnter the name of the vertex:-";
cin>>name;
g.addvertex(name);
break;
case 2:
g.viewvertex();
break;
case 3:
cout<<"\nEnter the spot:-";
cin>>string1;
cout<<"\nEnter the destination!";
cin>>string2;
cout<<"\nEnter cost:-";
cin>>cost;
g.addedge(string1,string2,cost);
break;
case 4:
cout<<"\nEnter the spot:-";
cin>>string1;
cout<<"\nEnter the destination!";
cin>>string2;
g.viewcostofedge(string1,string2);
break;
case 5:
exit(0);
default:
cout<<"\nWrong Choice!";
}
}while(1);
}
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