代码：
1 import java.util.*; 2 public class Main { 3 public static void main (String [] args) { 4 int repeat,a,n; 5 Scanner s=new Scanner(System.in); 6 repeat=s.nextInt(); 7 for(int i=1;i<=repeat;i++) { 8 a=s.nextInt(); 9 n=s.nextInt(); 10 int sum=0; 11 int p=a; 12 for(int j=1;j<=n;j++) 13 { 14 sum+=p; 15 p=p*10+a; 16 } 17 System.out.println(sum); 18 } 19 } 20 }