aaaaa, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
        }
        
        static int D(int i, int j, int[] x, int[] y)
        {
            if (x[i - 1] == y[j - 1])
                return 1;
            return 0;
        }
        
        static int F(int m, int n, int[] x, int[] y)
        {
            if (n == 0)
            {
                return m;
            }
            else if (m == 0 && n > 0)
            {
                return n;
            }
            
            Task<int> first = Task.Factory.StartNew(() => F(m - 1, n, x, y));
            Task<int> second = Task.Factory.StartNew(() => F(m, n - 1, x, y));
            Task<int> third = Task.Factory.StartNew(() => D(m, n, x, y));
            Task<int> fourth = Task.Factory.StartNew(() => F(m - 1, n - 1, x, y));
            
            Task.WaitAll(first, second, third, fourth);

return Math.Min(Math.Min(1 + first.Result, 1 + second.Result), third.Result + fourth.Result);
        }
    }
}


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