// Fill in your solution to rearrange, then compile and run the
// program

import java.util.*;

public class Rearrange {
    public static void rearrange(ArrayList<Integer> list) {
        // fill in your solution here
        // you can also rename the parameter above
    }

    // this is the sample solution
    public static void rearrange2(ArrayList<Integer> list) {
        int count = 0;
        for (int i = 1; i < list.size(); i++) {
            if (i % 2 == 0) {
                count++;
                int move = list.remove(i);
                list.add(count, move);
            }
        }
    }

    private static int testCount, failCount;

    public static final int ERRORS_MAX = 25;

    public static void main(String[] args) {
        failCount = 0;
        for (int i = 0; i <= 15; i++) {
            test(i);
        }
        if (failCount == 0) {
            System.out.println("PASSED all " + testCount + " tests");
        }
    }

    public static void test(int i) {
        int[] data = new int[i];
        test(data, 0);
    }
    
    public static void test(int[] data, int index) {
        if (index == data.length) {
            testCount++;
            ArrayList<Integer> data1 = new ArrayList<Integer>();
            ArrayList<Integer> data2 = new ArrayList<Integer>();
            for (int n : data) {
                data1.add(n);
                data2.add(n);
            }
            boolean fail = false;
            RuntimeException except = null;
            try {
                rearrange(data1);
            } catch (RuntimeException e) {
                fail = true;
                except = e;
            }
            rearrange2(data2);
            fail = fail || !data1.equals(data2);
            if (fail) {
                if (except != null) {
                    StackTraceElement[] trace = except.getStackTrace();
                    int line = trace[0].getLineNumber();
                    System.out.println("FAIL for " + Arrays.toString(data) +
                                       " with exception at line#" + line);
                } else {
                    System.out.println("FAIL for " + Arrays.toString(data));
                }
                System.out.println("correct: " + data2);
                System.out.println("yours  : " + data1);
                System.out.println();
                failCount++;
                if (failCount > ERRORS_MAX) {
                    System.out.println("exceeds " + ERRORS_MAX + " errors");
                    System.out.println("with " + testCount + " correct");
                    System.exit(0);
                }
            }
        } else {
            data[index] = 10 + index;
            test(data, index + 1);
            data[index] = 11 + index;
            test(data, index + 1);
        }
    }
}