Poj Solution 1472

http://poj.org/problem?id=1472

/* @author: */
import java.io.BufferedInputStream;
import java.util.Scanner;
import java.util.Arrays;

class Main
{
  public static Scanner cin=new Scanner(new BufferedInputStream(System.in));
  public static int [] coef=new int[11];
  public static String temp;
  public static void work(int con,int expo)
  {
    while (true)
    {
    temp=cin.next();
    switch (temp.charAt(0))
    {
      case 'O':
       coef[expo]+=con*Integer.parseInt(cin.next());
       break;
     case 'L':
      temp=cin.next();
      if (temp.charAt(0)=='n')
       work(con,expo+1);
      else
       work(con*Integer.parseInt(temp),expo);
      break;
    case 'E':
      return;
     }
    }
  }

  public static void output()
  {
    int i,j=0,now=0;
    for (i=0;i<=10;i++)
     if (coef[i]!=0)
    j++;
     if (j==0)
     {
    System.out.print(0);
    return;
      }
     else
    for (i=10;i>=0;i--)
      if (coef[i]!=0)
       if (i==0)
        System.out.print(coef[i]);
       else
       {
         if (coef[i]==1)
        System.out.print("n");
         else
        System.out.print(coef[i]+"*n");
         if (i>1)
        System.out.print("^"+i);
         if (now< j-1)
        System.out.print("+");
         now++;
       }
    }
    
  public static void main(String [] args)
  {
    int n=Integer.parseInt(cin.nextLine()),i;
    for (i=1;i<=n;i++)
    {
        Arrays.fill(coef,0);
     temp=cin.next();
     work(1,0);
     System.out.println("Program #"+i);
     System.out.print("Runtime = ");
     output();
     System.out.println();
     System.out.println();
    }
   }
}