leetcode937

public class Solution
    {
        public string[] ReorderLogFiles(string[] logs)
        {
            var list1 = new List<string>();
            var list2 = new List<string>();
            foreach (var log in logs)
            {
                var spacePosition = log.IndexOf(‘ ‘);
                var c = log[spacePosition + 1];
                if (c >= 48 && c <= 57)
                {
                    list2.Add(log);
                }
                else
                {
                    list1.Add(log);
                }
            }
            var list = list1.OrderBy(x => x.Substring(x.IndexOf(‘ ‘) + 1)).ToList();
            list.AddRange(list2);
            return list.ToArray();
        }
    }