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 * and open the template in the editor.
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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 hk.polyu.cslhu.codejam.thread;

import hk.polyu.cslhu.codejam.lib.ResultCollector;
import hk.polyu.cslhu.codejam.solution.Solution;
import hk.polyu.cslhu.codejam.solution.impl.StoreCredit;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.apache.log4j.Logger;

public class JamThreadManager {
	public static Logger logger = Logger.getLogger(JamThreadManager.class);
	
	private final ExecutorService pool;
	private Solution solutionPrototype;
	private List<List<String>> testCaseList;
	private boolean allowMultiThreads;
	private int numOfThreads;
	private ResultCollector resultCollector;
	
	/**
	 * Constructs an instance of JamThreadManager
	 * 
	 * @param solutionPrototype Solution The prototype of solution
	 * @param testCaseList List<List<String>> The data of test cases
	 * @param resultFile String The location of result file
	 * @param allowMultiThreads boolean The multi-threads mode is enabled if true; otherwise single thread is used
	 */
	public JamThreadManager(
			Solution solutionPrototype, List<List<String>> testCaseList, String resultFile, String resultPattern, boolean allowMultiThreads) {
		this.pool = Executors.newCachedThreadPool();
		this.solutionPrototype = solutionPrototype;
		this.testCaseList = testCaseList;
		this.allowMultiThreads = allowMultiThreads;
		this.numOfThreads = this.allowMultiThreads ? Runtime.getRuntime().availableProcessors() : 1;
		this.resultCollector = new ResultCollector(testCaseList.size(), resultFile, resultPattern);
	}
	
	/**
	 * Initialize the threads to set off
	 * @throws CloneNotSupportedException 
	 */
	public void runThreads() throws CloneNotSupportedException {
		List<List<List<String>>> subTasks = this.divideTestCases();
		int testCaseIndex = 1;
		
		for (List<List<String>> subTask : subTasks) {
			JamThread jamThread = this.createJamThread();
			jamThread.setSolution(this.solutionPrototype.clone());
			jamThread.setIndexOfList(testCaseIndex);
			jamThread.setTestCaseList(subTask);
			jamThread.setResultCollector(this.resultCollector);
			
			// update testCaseIndex
			testCaseIndex++;
			
			// run the thread
			this.pool.execute(jamThread);
		}
	}
	
	/**
	 * Divide the test cases into numOfThreads pieces
	 * 
	 * @return List<List<List<String>>> The subtasks
	 */
	private List<List<List<String>>> divideTestCases() {
		// TODO Auto-generated method stub
		List<List<List<String>>> subTasks = new ArrayList<List<List<String>>>();
		
		// set the number of test cases per subtask
		int numOfTestCasesPerSubtask = this.testCaseList.size();
		
		if (this.allowMultiThreads) {
			if (this.testCaseList.size() < this.numOfThreads)
				numOfTestCasesPerSubtask = 1;
			else
				numOfTestCasesPerSubtask = (int) Math.floor(this.testCaseList.size() / this.numOfThreads); 
		}
			
		// dive the test case list
		for (int i = 0; i < Math.min(this.testCaseList.size(), this.numOfThreads); i++) {
			int fromIndex = i * numOfTestCasesPerSubtask;
			int toIndex = (i == this.numOfThreads - 1) ? this.testCaseList.size() : (i + 1) * numOfTestCasesPerSubtask;
			subTasks.add(this.testCaseList.subList(fromIndex, toIndex));
		}
		
		return subTasks;
	}

	// Factory method of creating jam thread
	private JamThread createJamThread() {
		// TODO Auto-generated method stub
		return new JamThread() {
			
			@Override
			public void run() {
				// TODO Auto-generated method stub
				List<String> result = new ArrayList<String>();
				
				for (List<String> testCase : this.getTestCaseList()) {
					this.getSolution().setProblem(testCase);
					this.getSolution().solve();
					result.add(this.getSolution().getResult());
				}
				
				this.getResultCollector().updateResult(this.getIndexOfList(), result);
			}
		};		
	}
}
