public int GetLongestSubArray(int[] array)
{
    var firstPosition = 0;
    var length = 1;


    var currentFirstPosition = 0;
    var currentLength = 1;

    for (var i = 1; i < array.Length; i++)
    {
        if (array[i] == currentFirstPosition)
        {
            currentLength++;
        }
        else
        {
            currentLength = 1;
            currentFirstPosition = i;
        }
        if (currentLength > length)
        {
            length = currentLength;
            firstPosition = currentFirstPosition;
        }
    }

    return firstPosition;
}