botanics

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

namespace Q111
{
    class Program
    {
        static private int _n; static private bool _ntof; static private int[] ans; static private char[] par = { ' ' }; static private int[] sans;
        static void Main(string[] args)
        {
              for (; ; )
            {
            labeln: Console.Write("N>>>");
                _ntof = int.TryParse(Console.ReadLine(), out _n);
                if (!_ntof) goto labeln;
                ans = new int[_n];
            labelans: Console.Write("Correct Ans>>>");
                try
                {
                    ans = Array.ConvertAll<string, int>(Console.ReadLine().Split(par, StringSplitOptions.RemoveEmptyEntries), int.Parse);
                }
                catch
                {
                    goto labelans;
                }
                if (ans.Length != _n) goto labelans;
                for (; ; )
                {
                label: Console.Write("Ans>>>");
                    try
                    {
                        sans = Array.ConvertAll<string, int>(Console.ReadLine().Split(par, StringSplitOptions.RemoveEmptyEntries), int.Parse);
                    }
                    catch
                    {
                        goto label;
                    }
                    if (sans.Length != _n) goto label;
                    Console.WriteLine("{0}", lcs_length(ans.Length, sans.Length));
                }
            }
        }

        static public int lcs_length(int s1Len, int s2Len)
        {
            int i, j;
            int[,] table = new int[s1Len + 1, s2Len + 1];

            for (i = 1; i <= s1Len; ++i)
            {
                for (j = 1; j <= s2Len; ++j)
                {
                    if (ans[i - 1] == sans[j - 1])
                        table[i, j] = table[i - 1, j - 1] + 1;
                    else if (table[i - 1, j] > table[i, j - 1])
                        table[i, j] = table[i - 1, j];
                    else
                        table[i, j] = table[i, j - 1];
                }
            }
            return table[s1Len, s2Len];
        }
    }
}