Different Digits (UVA - 12527, UVALive 6134, Regionals 2012 >> Latin America)

///     Raihan Ruhin
///     CSE, Jahangirnagar University.
///     Dhaka-Bangladesh.
///     id: raihanruhin (topcoder / codeforces / codechef / uva / uvalive), 3235 (lightoj)
///     mail: raihanruhin@ (yahoo / gmail / facebook)
///     blog: ruhinraihan.blogspot.com

#include<bits/stdc++.h>
using namespace std;

#define SET(a) memset(a,-1,sizeof(a))
#define CLR(a) memset(a,0,sizeof(a))
#define PI acos(-1.0)

#define MOD 1000000007
#define MX 100000


int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    int tc, kk=1, n, m, x, y, a, b, c;
    bool arr[10];
    string s;
    //cin>>tc;
    while(cin>>n>>m)
    {
        int cnt=0;
        for(int i=n;i<=m;i++)
        {
            CLR(arr);
            x=i;
            while(x)
            {
                if(arr[x%10])
                {
                    cnt--;
                    break;
                }
                else arr[x%10]=true;
                x/=10;
            }
            cnt++;
        }
        cout<< cnt <<"\n";
    }
return 0;
}