47 lines
1.3 KiB
Java
47 lines
1.3 KiB
Java
import java.io.*;
|
|
import java.util.*;
|
|
|
|
public class Main {
|
|
|
|
static long pow(long a, long b){
|
|
if(b==0) return 1;
|
|
return pow(a, b-1) * a;
|
|
}
|
|
|
|
static long q_cnt(String a){
|
|
long r=0;
|
|
for(int i=0;i<a.length();i++){
|
|
if(a.charAt(i) == '?') r++;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
static long cnt(int i, String a, String b, long rm){
|
|
if(i==a.length()) return 0;
|
|
if(a.charAt(i)=='?'){
|
|
return (long)('9' - b.charAt(i))*pow(10, rm - 1) + cnt(i+1, a, b, rm - 1);
|
|
}
|
|
else{
|
|
if(a.charAt(i) < b.charAt(i)) return 0;
|
|
if(a.charAt(i) > b.charAt(i)) return pow(10, rm);
|
|
return cnt(i+1, a, b, rm);
|
|
}
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
Scanner sc = new Scanner(System.in);
|
|
int t = Integer.parseInt(sc.nextLine());
|
|
while(t-->0){
|
|
String a = sc.next(), b = sc.next();
|
|
long n = q_cnt(a);
|
|
if(a.length()<b.length() || n==0) System.out.println(0);
|
|
else if(a.length() > b.length()){
|
|
if(a.charAt(0) == '?') System.out.println(9*pow(10, n-1));
|
|
else System.out.println(pow(10, n));
|
|
}else{
|
|
System.out.println(cnt(0,a,b,n));
|
|
}
|
|
}
|
|
}
|
|
}
|