case 2부분 부탁드려요 ㅠㅠㅠㅠㅠ
        static void Main(string[] args)
         {
            int i, j, n;
            int temp = 0;
            int l_range, h_range;
            int[,] arr = new int[5,5];
            int[] histogram = new int[10];
            Random r = new Random();

            Console.WriteLine("===== 랜덤 난수 발생기 =====");

            while (true)
            {
                Console.WriteLine("1. 난수만들기");
                Console.WriteLine("2. 히스토그램");
                Console.WriteLine("3. 종료");
                Console.Write("\\n메뉴 선택 : ");
                n = int.Parse(Console.ReadLine());

                switch (n)
                {
                    case 1:
                        {
                            Console.Write("\\n랜덤 난수의 최저 값 : ");
                            l_range = int.Parse(Console.ReadLine());

                            Console.Write("랜덤 난수의 최고 값 : ");
                            h_range = int.Parse(Console.ReadLine());
                          
                         
                            for (i = 0; i < 5; i++)
                              {
                                      for (j =0; j < 5; j++)
                                       {
                                              arr[i, j] = r.Next(l_range, h_range);
                                       }
                               }

                            Console.WriteLine("===== 난수 출력 =====");

                                 for (i = 0; i < 5; i++)
                              {
                                  for (j = 0; j < 5; j++)
                                  {

                                      Console.Write(arr[i, j] + " ");
                                     
                                  }
                                      Console.WriteLine();
                               }

                            Console.WriteLine("=======================");
                            break;
                        }
                    case 2:
                        {
                            Console.WriteLine("\\n히스토그램 출력");

                            for (i = l_range; i <= h_range; i++)
                            {
                                for (j = l_range; j <= h_range; j++)
                                {
                                    if( arr[i,j] == 1)
                                    {
                                        arr[i-l_range]++;
                                        Console.Write(l_range++ + " : " +arr[i,j]);
                                    }
                                }
                            }
                            break;
                        }
                    case 3:
                        {
                            Console.WriteLine("\\n프로그램 종료!!!!");

                            break;
                        }
                    default:
                        {
                            Console.WriteLine("\\n해당되는 번호가 없습니다. 다시 선택해 주십시오");
                            continue;
                        }
                 }

                Console.WriteLine();

                 if (n == 3)
               {
                break;
               }
            }
          
   case 2부분 부탁드려요 ㅠㅠㅠㅠㅠ
    최저값 : 몇개
        .
       .
        .
       .
    최대값 : 몇개

 이렇게나와야하는데 대가리뽀사지겟네여 ㅜㅜㅜㅜㅜㅜ 모르겟어여..