C#

public static string balancedSums(List arr) {

    int sumLeft = 0;
    int sumRight = arr.Skip(1).Sum();

    for(int i = 0; i < arr.Count; i++)
    {  
        if(i>0)
        {          
            sumLeft += arr[i - 1];
            sumRight -= arr[i];
        }             

        if(sumLeft == sumRight)
        {
            return "YES";
        }     
    }

    return "NO";
}