【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);
        }
    }
}