using System;
namespace P4_13
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] lbArray = new int[] { 3, 2, 1, 2, 5, 2, 4 };
            Console.WriteLine("ԭʼԪصǣ");
            foreach (int lb in lbArray)
            {
                Console.Write(lb + ",   ");
            }
            Console.WriteLine();
            Console.WriteLine();
            Console.WriteLine("һγ2λ" + Array.IndexOf(lbArray, 2));
            Console.WriteLine("һγ2λ" + Array.LastIndexOf(lbArray, 2));
    Console.WriteLine("ʹIndexOfм2λ" + Array.IndexOf(lbArray, 2, 2, 3));
Console.WriteLine("ʹLastIndexOfм2λ" + Array.LastIndexOf(lbArray, 2, 4, 3));
            Console.ReadLine();
        }
        
    }
