高精度——sgu112

计算a^b-b^a

import java.util.*;
import java.math.*;
public class Solution {
    public static void main(String args[]){
        
        Scanner scan=new Scanner(System.in);
        
        int a=scan.nextInt();
        int b=scan.nextInt();
        
        BigInteger x =BigInteger.valueOf(a);
        BigInteger y =BigInteger.valueOf(b);
        x=x.pow(b);
        y=y.pow(a);
        
        System.out.println(x.subtract(y));
        
        
    }
}