【HDOJ】1063 Exponentiation

这道题目莫名其妙的wa，又莫名其妙的过了。

 import java.util.Scanner;
 import java.math.BigDecimal;

 public class Main {
     public static void main(String[] args) {
         Scanner cin = new Scanner(System.in);
         while (cin.hasNext()) {
             BigDecimal br = cin.nextBigDecimal();
             int n = cin.nextInt();
             String ans = br.pow(n).stripTrailingZeros().toPlainString();
             int i;
             for (i=0; i<ans.length(); ++i)
                 if (ans.charAt(i) != '0')
                     break;
             String val =  ans.substring(i, ans.length());

             System.out.println(val);
         }
     }
 }