Longest Common Subsequence in C#

Welcome to the Longest Common Subsequence in C# page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

using System;
using System.Collections.Generic;
using System.Linq;

namespace SamplePrograms
{
    public class LongestCommonSubsequence
    {
        private static IEnumerable<string> LCS(IEnumerable<string> list1, IEnumerable<string> list2)
        {
            if (list1.Count() == 0 || list2.Count() == 0)
                return new List<string>();

            if (list1.First().Equals(list2.First()))
                return LCS(list1.Skip(1), list2.Skip(1)).Concat(new List<string>() { list1.First() });

            return Longest(LCS(list1, list2.Skip(1)), LCS(list1.Skip(1), list2));
        }

        private static IEnumerable<string> Longest(params IEnumerable<string>[] lists) =>
            lists.OrderByDescending(l => l.Count()).First();

        public static void Main(string[] args)
        {
            try
            {
                var list1 = args[0].Split(',').Select(i => i.Trim());
                var list2 = args[1].Split(',').Select(i => i.Trim());
                var lcs = LCS(list1, list2).Reverse();
                Console.WriteLine(string.Join(", ", lcs));
            }
            catch
            {
                Console.WriteLine("Usage: please provide two lists in the format \"1, 2, 3, 4, 5\"");
                Environment.Exit(1);
            }
        }
    }
}

Longest Common Subsequence in C# was written by:

• Parker Johansen

If you see anything you'd like to change or update, please consider contributing.

Note: The solution shown above is the current solution in the Sample Programs repository as of Mar 26 2019 00:19:47. The solution was first committed on Oct 28 2018 02:58:40. As a result, documentation below may be outdated.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.