int arr[] = { 4,6,2,2,1,6,9,9,10,10 ,9,4}; int n = sizeof(arr) / sizeof(int);

for (int i = 0; i < n; i++) {
    for (int j = 0; j < n; j++) {
        if (arr[i] == arr[j] && j != i) {
            arr[j] = arr[j + 1];
            
            n--;
        }
    }
}

for (int i = 0; i < n; i++) {
    cout << arr[i] << " ";
}

return 0;