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package year_2012.qualification;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashSet;
import java.util.Set;

/**
 *
 * @author paul
 * @date 14 Apr 2012
 */
public class QuestionC {

    private static Set<Integer> getCycle(int x) {

        String s = Integer.toString(x);
        Set<Integer> set = new HashSet<Integer>();
        set.add(x);
        for (int c = 1; c < s.length(); c++) {
            String t = s.substring(c).concat(s.substring(0, c));
            set.add(Integer.parseInt(t));
        }
        return set;
        
    }

    private static Set<Integer> mask(Set<Integer> set, int a, int b) {
        Set<Integer> result = new HashSet<Integer>();

        for (int x : set) {
            if (x >= a && x <= b) {
                result.add(x);
            }
        }
        
        return result;

    }


    public static void main(String[] args) throws FileNotFoundException, IOException {

        String question = "C";

//        String name = "large";
        String name = "small-attempt0";
//        String name = "test";

        String filename = String.format("%s-%s", question, name);

        BufferedReader input = new BufferedReader(
                new FileReader(String.format("/home/paul/Documents/code-jam/2012/qualification/%s.in",
                filename)));

        String firstLine = input.readLine();

        PrintWriter pw = new PrintWriter(new File(
                String.format("/home/paul/Documents/code-jam/2012/qualification/%s.out", filename)));


        int T = Integer.parseInt(firstLine);

        // Loop through test cases.
        for (int i = 0; i < T; i++) {

//             Read data.
            String[] tokens = input.readLine().split(" ");

//            int N = Integer.parseInt(input.readLine());

            int A = Integer.parseInt(tokens[0]);
            int B = Integer.parseInt(tokens[1]);

//            System.out.format("%d, %d\n", A, B);

            boolean[] used = new boolean[B+1];
            int total = 0;
            for (int n = A; n <= B; n++) {
                if (!used[n]) {
                    Set<Integer> set = mask(getCycle(n), A, B);
                    int k = set.size();
                    total += (k * (k-1))/2;
                    for (int m : set) {
                        used[m] = true;
                    }
                }
            }

            pw.format("Case #%d: %d\n", i + 1, total);
        }

        pw.close();

    }

}

package de.pat.dev.y2012.qualification.c;

import java.util.*;

/**
 * @author pat.dev@alice.de
 */
public class RecycledNumber {
  private final long lower;
  private final long upper;
  private final long rotationFactor;

  public RecycledNumber(long lower, long upper) {
    this.lower = lower;
    this.upper = upper;
    int numberOfDigits = String.valueOf(lower).length();
    rotationFactor = rotationFactor(numberOfDigits);
  }

  private long rotationFactor(int numberOfDigits) {
    long factor = 1;
    for (int i = 1; i < numberOfDigits; i++) {
      factor *= 10;
    }
    return factor;
  }

  public Set<Pair> pairs() {
    Set<Pair> pairs = new HashSet<Pair>();
    for (long number = lower; number <= upper; number++) {
      Set<Long> rotations = rotations(number);
      for (Long rotation : rotations) {
        pairs.add(new Pair(number, rotation));
      }
    }
    return pairs;
  }

  public Set<Long> rotations(long number) {
    if (rotationFactor == 1) {
      return Collections.emptySet();
    }

    Set<Long> rotations = new HashSet<Long>();
    long rotation = rotate(number);
    while (rotation != number) {
      if (rotation > number && rotation <= upper) {
        rotations.add(rotation);
      }
      rotation = rotate(rotation);
    }
    return rotations;
  }

  private long rotate(long number) {
    long lastDigit = number % 10;
    return number / 10 + lastDigit * this.rotationFactor;
  }

  public static final class Pair {
    public final long m;
    public final long n;

    public Pair(long m, long n) {
      this.m = m;
      this.n = n;
    }

    @Override
    public String toString() {
      return "Pair{" +
        "m=" + m +
        ", n=" + n +
        '}';
    }

    @Override
    public boolean equals(Object o) {
      if (this == o) return true;
      if (!(o instanceof Pair)) return false;

      Pair pair = (Pair) o;

      if (m != pair.m) return false;
      if (n != pair.n) return false;

      return true;
    }

    @Override
    public int hashCode() {
      int result = (int) (m ^ (m >>> 32));
      result = 31 * result + (int) (n ^ (n >>> 32));
      return result;
    }
  }
}
