ACM Q101 - C#

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

namespace test
{
    class test
    {
  
        static void Main(){

         int stack_n = int.Parse(Console.ReadLine());
         Stack<int>[] intStack = new Stack<int>[stack_n];
         int[] Block = new int[stack_n];

         for (int i = 0; i < stack_n; i++)
         {
             Block[i] = i;
            intStack[i] = new Stack<int>();
            intStack[i].Push(Block[i]);
         }

             while (true)
             {
         
                 string rl = Console.ReadLine();                
                 string[] parts = rl.Split(' ');

                 if (parts.Length == 4)
                 {
                     int a = int.Parse(parts[1]);
                     int b = int.Parse(parts[3]);

                     if (parts[0] == "move" && parts[2] == "onto")
                     {

                         while (intStack[Block[a]].Peek() != a)
                         {
                             int tmp = intStack[Block[a]].Pop();
                             intStack[tmp].Push(tmp);
                             Block[tmp] = tmp;
                         }
                         while (intStack[Block[b]].Peek() != b)
                         {
                             int tmp = intStack[Block[b]].Pop();
                             intStack[tmp].Push(tmp);
                             Block[tmp] = tmp;
                         }
                         int tmp2 = intStack[Block[a]].Pop();
                         intStack[Block[b]].Push(tmp2);
                         Block[tmp2] = Block[b];
                     }
                     else if (parts[0] == "move" && parts[2] == "over")
                     {
                         while (intStack[Block[a]].Peek() != a)
                         {
                             int tmp = intStack[Block[a]].Pop();
                             intStack[tmp].Push(tmp);
                             Block[tmp] = Block[b];
                         }
                         int tmp2 = intStack[Block[a]].Pop();
                         intStack[Block[b]].Push(tmp2);
                         Console.WriteLine("moveover " + tmp2+" "+a +" "+b);
                         Block[tmp2] = Block[b];
                     }
                     else if (parts[0] == "pile" && parts[2] == "onto")
                     {
                         Stack<int> tmpstack = new Stack<int>();
                         while (intStack[Block[a]].Peek() != a)
                         {
                             int tmp = intStack[Block[a]].Pop();
                             tmpstack.Push(tmp);
                         }
                         tmpstack.Push(intStack[Block[a]].Pop());
                         while (intStack[Block[b]].Peek() != b)
                         {
                             int tmp = intStack[Block[b]].Pop();
                             intStack[tmp].Push(tmp);
                             Block[tmp] = tmp;
                         }
                         while (tmpstack.Count > 0)
                         {
                             int tmp = tmpstack.Pop();
                             intStack[Block[b]].Push(tmp);
                             Block[tmp] = Block[b];
                         }
                     }
                     else if (parts[0] == "pile" && parts[2] == "over")
                     {
                         Stack<int> tmpstack = new Stack<int>();
                         while (intStack[Block[a]].Peek() != a)
                         {
                             int tmp = intStack[Block[a]].Pop();                     
                             tmpstack.Push(tmp);
                         }
                         tmpstack.Push(intStack[Block[a]].Pop());
                         while (tmpstack.Count > 0)
                         {
                             int tmp = tmpstack.Pop();
                             intStack[Block[b]].Push(tmp);
                             Block[tmp] = Block[b];
                         }
                     }
                 }

                 if(parts[0]=="quit")
                 {
                     break;
                 }
              
             }
             for (int i = 0; i < stack_n; i++)
             {
                 Console.Write(i + " :");
                 foreach (int j in intStack[i])
                 {
                     Console.Write(j);
                 }
                 Console.WriteLine();
             }            
        }
 

    }
}