求帮忙写个算法

Question

数据算法

Answer 1

var  s[] = {1000,1001,1002,1006,1009};
var result = Enumerable.Range(1000,10).Except(s);

Answer 2

        List<string> list = new List<string> { "1000", "1001", "1002", "1006", "1009", "abc10","abcd1", "abc11", 
                                                                          "abc12", "abc15", "abc123", "abc124","abcd5", "abc127" };
        Function(list);        private void Function(List<string> list)
        {
            list.GroupBy(GroupData).ToList().ForEach(x =>
            {
                x.OrderBy(o => o).GroupBy(GroupData2).ToList().ForEach(y =>
                {
                    IOrderedEnumerable<string> orders = y.OrderBy(o => o);
                    int min = Convert.ToInt32(Regex.Match(orders.First(), @"[\d]+").Value);
                    int max = Convert.ToInt32(Regex.Match(orders.Last(), @"[\d]+").Value);
                    IEnumerable<string> result = Enumerable.Range(min, max - min).Select(s => 
                        Regex.Replace(orders.First(), @"[\d]+", s.ToString())).Where(w => !orders.Contains(w));
                    MessageBox.Show(string.Join(";", result));
                });
            });
        }        private int GroupData(string str)
        {
            return str.Length;
        }        private string GroupData2(string str)
        {
            return Regex.Replace(str, @"[\d]+", string.Empty);
        }
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