C++ Programming Code Examples
C++ > Computer Graphics Code Examples
Program to Describe the Representation of Graph using Incidence List
/* Program to Describe the Representation of Graph using Incidence List
- This algorithm represent a graph using incidence list.
- The time complexity of this algorithm is O(e).
- This algorithm takes the input of the number of vertex and edges.
- Then it takes the input of connected vertex pairs.
- Print the incidence list.
- Exit. */
#include<iostream>
using namespace std;
int main()
{
int i, v, e, j, count;
// take the input of the number of edges.
cout<<"Enter the number of vertexes of the graph: ";
cin>>v;
cout<<"\nEnter the number of edges of the graph: ";
cin>>e;
int edge[e][2];
// Take the input of the adjacent vertex pairs of the given graph.
for(i = 0; i < e; i++)
{
cout<<"\nEnter the vertex pair for edge "<<i+1;
cout<<"\nV(1): ";
cin>>edge[i][0];
cout<<"V(2): ";
cin>>edge[i][1];
}
// Print the incidence list representation of the graph.
cout<<"\n\nThe incidence list representation for the given graph: ";
for(i = 0; i < e; i++)
{
// For each vertex print, its adjacent vertex.
cout<<"\n\tE("<<i+1<<") -> { ";
cout<<"V("<<edge[i][0]<<") , "<<"V("<<edge[i][1]<<")";
cout<<" }";
}
}
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