HR - Picking Numbers

    public static int pickingNumbers(List<int> a)
    {
        SortedDictionary<int, int> freqTable = new SortedDictionary<int, int>();
        int maxCount = 0;

        foreach (int i in a)
        {
            if (freqTable.ContainsKey(i) == true)
            {
                freqTable[i]++;
            }
            else
            {
                freqTable.Add(i, 1);
            }
        }

        if (freqTable.Count == 1) return a.Count;

        // foreach(var elem in freqTable)
        // Console.WriteLine(String.Concat(elem.Key.ToString(), " ", elem.Value.ToString()));

        for (int i = 0; i < freqTable.Keys.Count-1; i++)
        {
            int val = freqTable.ElementAt(i + 1).Key - freqTable.ElementAt(i).Key;
            // Console.WriteLine(val);
            if (val == 1){
                int tempCount = freqTable.ElementAt(i).Value + freqTable.ElementAt(i + 1).Value;
                if (tempCount > maxCount) maxCount = tempCount;
            }
        }

        return maxCount;
    }