Poj Solution 2897

http://poj.org/problem?id=2897

//* @author  mekarlos@gmail.com
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Main{
 public static void main(String[] args) throws IOException{
  BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
    int[] number=new int[100];
    int[] answer=new int[100];
    int count=Integer.parseInt(stdin.readLine()),carry, lastIndex,n,k;
    StringTokenizer token;
    for(int j=0;j< count;j++){
     token=new StringTokenizer(stdin.readLine());
    boolean shouldPrint=false;
    n=Integer.parseInt(token.nextToken());
    k=Integer.parseInt(token.nextToken());
    if(n>k){
        System.out.println(0);
        continue;
    }
    number[99]=k;
    carry=0;
    lastIndex=99;
    for(int i=99;i>=0;i--){
        answer[i]=(number[i]*n+carry)%10;
        carry=(number[i]*n+carry)/10;
        if(answer[i]==k){
            if(carry!=0){
                if(i!=0)number[i-1]=answer[i];
                
                continue;
            }
            shouldPrint=true;
            lastIndex=i;
            break;
        }
        if(i!=0)number[i-1]=answer[i];
        
    }
    if(number[lastIndex]==0) shouldPrint=false;
    if(!shouldPrint)System.out.println(0);
    else{
        for(int i=lastIndex;i<=99;i++)    System.out.print(number[i]);
        System.out.println();
    }
    }
  }
}