LargestAreaInMatrix

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

class Program
{
    static void Main()
    {
        findLargestArea(matrix);
    }
    static int [,] matrix = inputMatrix();
    static int [,] inputMatrix ()
    {
        string[] size = Console.ReadLine().Split(' ');
        int rows = Int32.Parse(size[0]);
        int cols = Int32.Parse(size[1]);



        int[,] matrix = new int[rows, cols];
        for (int row = 0; row < rows; row++)
        {
            string[] input = Console.ReadLine().Split(' ');
            for (int col = 0; col < cols; col++)
            {

                matrix[row, col] = Int32.Parse(input[col]);
            }
        }
        return matrix;
    }
    static int count = 0;
    static int currentElement = 0;
    static int bestLength = 0;static int bestNumber;
    static void findLargestArea(int [,] matrix)
    {
        for (int row = 0; row < matrix.GetLength(0); row++)
        {
            for (int col = 0; col < matrix.GetLength(1); col++)
            {
                currentElement = matrix[row, col];
                count = 0;
                GetCurrentAreaLength(row, col);
                if (count > bestLength)
                {
                    bestLength = count;
                    bestNumber = currentElement;
                }
            }
        }
        Console.WriteLine(bestLength);

    }

    static void GetCurrentAreaLength(int row, int col)
    {
        if (row < 0 || row >= matrix.GetLength(0) ||
                   col < 0 || col >= matrix.GetLength(1) ||
                   matrix[row, col] == int.MinValue)
        {
            return;
        }
        if (matrix[row,col]==currentElement)
        {
            matrix[row, col] = int.MinValue;
            count++;

            GetCurrentAreaLength(row - 1, col);
            GetCurrentAreaLength(row +1, col);
            GetCurrentAreaLength(row , col-1);
            GetCurrentAreaLength(row , col+1);

        }
    }

}