Swap kth node

PROBLEM :

Given an array, swap kth element from beginning with kth element from end.

Input:

The first line of input contains an integer T denoting the number of test cases.
The first line of each test case is N and k,N is the size of array and kth number.
The second line of each test case contains N input C[i].

Output:

Print the modified array.

Constraints:

1 = T = 100
1 = K = N = 500
1 = C[i] = 1000

Example:

Input
1
8 3
1 2 3 4 5 6 7 8

Output
1 2 6 4 5 3 7 8
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Simple C++ implementation :
---------------------------------------------------------------------------------

#include<iostream>
using namespace std;
void swap(int[],int,int) ;
int main()
 {
int a[1000],t,no,i,k ;
cin>>t ;
while(t--)
{
   cin>>no>>k ;
   for(i=0;i<no;i++)
       cin>>a[i] ;
     
  swap(a,no,k) ;
  for(i=0;i<no;i++)
       cout<<a[i]<<" " ;
     
      cout<<endl ;
}
return 0;
}

void swap(int a[],int no,int k)
{
    int i,j,temp ;
    i=0;j=no-1 ;
    k-- ;
    while(k--)
    {
        i++ ;
        j-- ;
    }
    temp=a[i] ;
    a[i]=a[j] ;
    a[j]=temp ;
}

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