AGBrown

public static bool SubsetSum(IEnumerable<int> list, int s) 
{
    var arr = list.ToArray();
    Array.Sort(arr);
    var a = arr.Where(i => i < 0).Sum();
    var b = arr.Where(i => i > 0).Sum();
    if(a > s || b < s)
    {
        return false;
    }