【HDOJ】1063 Exponentiation

这道题目莫名其妙的wa，又莫名其妙的过了。

 1 import java.util.Scanner;
 2 import java.math.BigDecimal;
 3 
 4 public class Main {
 5     public static void main(String[] args) {
 6         Scanner cin = new Scanner(System.in);
 7         while (cin.hasNext()) {
 8             BigDecimal br = cin.nextBigDecimal();
 9             int n = cin.nextInt();
10             String ans = br.pow(n).stripTrailingZeros().toPlainString();
11             int i;
12             for (i=0; i<ans.length(); ++i)
13                 if (ans.charAt(i) != '0')
14                     break;
15             String val =  ans.substring(i, ans.length());
16             
17             System.out.println(val);
18         }
19     }
20 }