Cpp program to remove duplicate elements from an array using while loop

Write a program to remove the duplicate elements from an array using while loop

#include <iostream>

using namespace std;

int main() {
    int arr[50],size;
    cout<<"Desired array size";
    cin>>size;
    cout<<"Enter the elements in an array";
    for(int a=0;a<size;a++)
    {
        cin>>arr[a];
    }
    int i = 0;
    while (i < size) {
        int j = i + 1;
        while (j < size) {
            if (arr[i] == arr[j]) {
                // Shift elements to the left starting from the duplicate element
                for (int k = j; k < size - 1; k++) {
                    arr[k] = arr[k + 1];
                }
                // above loop starts with index of the duplicate element in the array.
                // Decrease the size of the array
                size--;
            } 
            j++;
        }
        i++;
    }

    cout << "Array without duplicates: ";
    for (int i = 0; i < size; i++) {
        cout << arr[i] << " ";
    }
    cout << endl;

    return 0;
}

Desired array size

6

Enter the elements in an array

12

13

4

12

4

1

Array without duplicates: 12 13 4 1