URI1285DifferentDigits.java

import java.io.BufferedReader;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

/**
 * See
 * <a href="https://www.urionlinejudge.com.br/judge/en/problems/view/1285">Different
 * Digits</a>
 *
 * @author Brian Yeicol Restrepo Tangarife
 */
public class URI1285DifferentDigits {

    static Reader in = new Reader(System.in);
    static PrintWriter out = new PrintWriter(System.out);

    public static void main(String[] args) throws IOException {
        int N, M, s;
        while (in.hasNext()) {
            N = in.nextInt();
            M = in.nextInt();
            s = 0;
            for (int i = N; i <= M; i++) {
                if(!hasRepeatedChars(String.valueOf(i))){
                    s++;
                }
            }
            out.println(s);
        }
        in.close();
        out.close();
    }

    private static boolean hasRepeatedChars(String i) {
        return i.matches(".*(.).*\\1.*");
    }

    static class Reader implements Closeable {

        private final BufferedReader reader;
        private StringTokenizer tokenizer;

        public Reader(InputStream input) {
            reader = new BufferedReader(
                    new InputStreamReader(input));
            tokenizer = new StringTokenizer("");
        }

        private StringTokenizer getTokenizer() throws IOException {
            if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                String line = nextLine();
                if (line == null) {
                    return null;
                }
                tokenizer = new StringTokenizer(line);
            }
            return tokenizer;
        }

        public boolean hasNext() throws IOException {
            return getTokenizer() != null;
        }

        public String next() throws IOException {
            return hasNext() ? tokenizer.nextToken() : null;
        }

        public String nextLine() throws IOException {
            tokenizer = null;
            return reader.readLine();
        }

        public int nextInt() throws IOException {
            return Integer.parseInt(next());
        }

        public long nextLong() throws IOException {
            return Long.parseLong(next());
        }

        public float nextFloat() throws IOException {
            return Float.parseFloat(next());
        }

        public double nextDouble() throws IOException {
            return Double.parseDouble(next());
        }

        public String[] nextStringArray(int size) throws IOException {
            String[] array = new String[size];
            for (int i = 0; i < size; i++) {
                array[i] = next();
            }
            return array;
        }

        public int[] nextIntArray(int size) throws IOException {
            int[] array = new int[size];
            for (int i = 0; i < size; i++) {
                array[i] = nextInt();
            }
            return array;
        }

        public long[] nextLongArray(int size) throws IOException {
            long[] array = new long[size];
            for (int i = 0; i < size; i++) {
                array[i] = nextLong();
            }
            return array;
        }

        public double[] nextDoubleArray(int size) throws IOException {
            double[] array = new double[size];
            for (int i = 0; i < size; i++) {
                array[i] = nextDouble();
            }
            return array;
        }

        @Override
        public void close() throws IOException {
            tokenizer = null;
            reader.close();
        }
    }
}