2, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var text = new[]{@"test1\abc\a.xml"
                            ,@"test1\abc\n.cs"
                            ,@"test1\HB\proc1\candidate1\rel1\spy\can.xml"
                            ,@"test1\HB\proc1\candidate1\rel1\spy\globals.xml"
                                ,@"test1\HB\proc1\candidate1\rel1\spy\mike.cs"};
            
            foreach(var item in EnumerateAllPaths(text))
                Console.WriteLine(item);
            
            
        }
        
        public static IEnumerable<string> EnumerateAllPaths(string[] input)
        {
            var hs = new HashSet<string>();
            
            foreach(var s in input)
            {
                var parts = s.Split(new[]{@"\"},StringSplitOptions.None);
                
                for(var i = 0;i<parts.Length;i++)
                {
                    var section = String.Join(@"\", parts.Take(i+1));
                    if(hs.Add(section))
                        yield return section;
                }
                                    
            }
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,11 sec, cpu time: 0,08 sec, average memory usage: 13 Mb, average nr of threads: 3