Program to Calculate the Edge Cover of a Graph

Last Updated : 23 Dec, 2022

Given the number of vertices N of a graph. The task is to determine the Edge cover.
Edge Cover: Minimum number of edges required to cover all vertex is known as Edge Cover.

Examples:

Input : N = 5
Output : 3

Input : N = 4
Output : 2

Example 1: For N = 5 vertices,

Edge Cover is: 3 (Choosing the edges marked in Red, all of the vertices will get covered)

Example 2: For N = 8 vertices,

Edge Cover is: 4 (Choosing the edges marked in Red, all of the vertices will get covered)

Formula:

Edge Cover = ceil (no. of vertices / 2)

Implementation:

C++

// C++ program to find Edge Cover
#include <bits/stdc++.h>
using namespace std;

// Function that calculates Edge Cover
int edgeCover(int n)
{
    float result = 0;

    result = ceil(n / 2.0);

    return result;
}

// Driver Code
int main()
{
    int n = 5;

    cout << edgeCover(n);

    return 0;
}

Java

// Java program to find Edge Cover
import java.util.*;
import java.lang.*;
import java.io.*;

class GFG{
// Function that calculates Edge Cover
static int edgeCover(int n)
{
    int result = 0;
 
    result = (int)Math.ceil((double)n / 2.0);
 
    return result;
}
 
// Driver Code
public static void main(String args[])
{
    int n = 5;
 
    System.out.print(edgeCover(n));
}

}

Python3

# Python 3 implementation of the above approach.

import math

# Function that calculates Edge Cover 
def edgeCover(n):
    
    result = 0
    
    result = math.ceil(n / 2.0)
    
    return result
    
    
# Driver code      
if __name__ == "__main__" : 
  
    n =  5
  
    print(int(edgeCover(n)))

# this code is contributed by Naman_Garg

// C# program to find Edge Cover
using System;

class GFG
{
// Function that calculates Edge Cover
static int edgeCover(int n)
{
    int result = 0;

    result = (int)Math.Ceiling((double)n / 2.0);

    return result;
}

// Driver Code
static public void Main ()
{
    int n = 5;
    
    Console.Write(edgeCover(n));
}
}

// This code is contributed by Raj

PHP

<?php
// PHP program to find Edge Cover

// Function that calculates
// Edge Cover
function edgeCover($n)
{
    $result = 0;

    $result = ceil($n / 2.0);

    return $result;
}

// Driver Code
$n = 5;

echo edgeCover($n);

// This code is contributed by Raj
?>

JavaScript

<script>

// javascript program to find Edge Cover

// Function that calculates Edge Cover
    function edgeCover(n) {
        var result = 0;

        result = parseInt( Math.ceil(n / 2.0));

        return result;
    }

    // Driver Code
    
        var n = 5;

        document.write(edgeCover(n));

// This code contributed by gauravrajput1

</script>