C++ Program to Implement Nearest Neighbour Algorithm

This is a C++ Program to implement nearest neighbour algorithm to solve TSP. This C++ program implements the Travelling Salesman Problem which computes the minimum cost required to visit all the nodes by traversing across the edges only once.

Here is source code of the C++ Program to Implement Nearest Neighbour Algorithm. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
#include<stdio.h>
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```
#include<conio.h>
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```
#include<iostream>
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```
 
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using namespace std;
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int c = 0, cost = 999;
```

int graph[4][4] = { { 0, 10, 15, 20 }, { 10, 0, 35, 25 }, { 15, 35, 0, 30 }, {

```
        20, 25, 30, 0 } };
```
```
 
```
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void swap(int *x, int *y)
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```
{
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    int temp;
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    temp = *x;
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    *x = *y;
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    *y = temp;
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}
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void copy_array(int *a, int n)
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{
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    int i, sum = 0;
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    for (i = 0; i <= n; i++)
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    {
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        sum += graph[a[i % 4]][a[(i + 1) % 4]];

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    }
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    if (cost > sum)
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    {
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        cost = sum;
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    }
```
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}
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void permute(int *a, int i, int n)
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{
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    int j, k;
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    if (i == n)
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    {
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        copy_array(a, n);
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    }
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    else
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    {
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        for (j = i; j <= n; j++)
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        {
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            swap((a + i), (a + j));
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            permute(a, i + 1, n);
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            swap((a + i), (a + j));
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        }
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    }
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}
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int main()
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{
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    int i, j;
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    int a[] = { 0, 1, 2, 3 };
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    permute(a, 0, 3);
```

    cout << "minimum cost:" << cost << endl;

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}
```

Output:

$ g++ TSPNearestNeighbour.cpp
$ a.out
 
minimum cost:80
 
------------------
(program exited with code: 0)
Press return to continue

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