http://poj.org/problem?id=3286 //* @author: 82638882@163.com import java.io.*; public class Main { static long[] a=new long[]{ 1,10,100,1000,10000,100000,1000000,10000000,100000000,1000000000 }; static long[] b=new long[]{ 0,1,11,192,2893,38894,488895,5888896,68888897,788888898 }; static long[] c=new long[]{ 0,1,20,300,4000,50000,600000,7000000,80000000,900000000 }; public static void main(String[] args) throws IOException { InputStreamReader is=new InputStreamReader(System.in); BufferedReader in=new BufferedReader(is); while(true) { String[] ss=in.readLine().split(" "); long a=Long.parseLong(ss[0]); long b=Long.parseLong(ss[1]); if(a==-1&&b==-1)break; if(a==0)System.out.println(f(b)+1); else System.out.println(f(b)-f(a-1)); } } static long f(long w) { int i; long q=w; for(i=0;i< 10;i++) if(a[i]>w)break; long sum=0; for(int j=i-1;j>0;j--) { long u=w/a[j]; if(u>0) sum+=b[j]+(u-1)*c[j]; w=w%a[j]; } long total=0,oo=0; w=q; String s=w+""; for(int j=1;j< i-1;j++) { if(w%(a[j]*10)>=a[j]){ total+=a[j]-1; oo+=total; } else oo+=w%(a[j]*10); } int bb=0; long yy=0; for(int g=1;g< s.length();g++) { if(s.charAt(g)!='0'){ bb++; continue; } yy+=(Math.pow(10, s.length()-g-1)-1)*bb; } sum+=oo; sum+=yy; return sum; } }
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