HackerRank Sherlock and Array

class Result
{

    /*
     * Complete the 'balancedSums' function below.
     *
     * The function is expected to return a STRING.
     * The function accepts INTEGER_ARRAY arr as parameter.
     */

    public static string balancedSums(List<int> arr)
    {
        int rightSum = arr.Sum();
        int leftSum = 0;

        for (var i = 0; i < arr.Count; i++)
        {
            rightSum -= arr[i];

            if (leftSum == rightSum)
            {
                return "YES";
            }

            leftSum += arr[i];
        }

        return "NO";
    }

}