C++ Program To Reverse An Array In O(n) Complexity

#include<iostream>
using namespace std;
int main()
{
  int *a;
  int i,j,temp;
  int n;
  cout<<"Enter The Size of Array \n";
  cin>>n;
  a=new int[n];
  int l=0,h=n-1;
  
 cout<<"Enter The Elements of Array \n";
  for(i=0;i<n;i++)
   cin>>a[i];
  while(l<h)
  {
    temp=a[l];
    a[l]=a[h];
    a[h]=temp;
    l++;
    h--;
  }
  
 cout<<"\nReverse Array Is\n";
  for(i=0;i<n;i++)
  {
   cout<<a[i]<<" ";
    }
   return 0;
}

Output:

Enter The Size of Array 

6

Enter The Elements of Array 

1 2 3 4 5 6

Reverse Array Is

6 5 4 3 2 1