// Program to test solutions to problem #9 on the cse142a final, winter 2015.
// Fill in your solution to splitPairs, then compile and run the program.

import java.util.*;

public class FinalTest9 {
    public static int[] splitPairs(int[] list) {
        // fill in your solution here
        // you can also rename the parameters above
    }

    // this is the sample solution
    public static int[] splitPairs2(int[] list) {
        int half = list.length / 2;
        int[] result = new int[list.length];
        for (int i = 0; i < list.length; i++) {
            if (i % 2 == 0) {
                result[i / 2] = list[i];
            } else if (list.length % 2 == 0) {
                result[i / 2 + half] = list[i];
            } else {
                result[i / 2 + half + 1] = list[i];
            }
        }
        return result;
    }

    private static int count, failCount;

    public static final int ERRORS_MAX = 10;

    public static void main(String[] args) {
        for (int i = 0; i < 10; i++) {
            test(i);
        }

        if (failCount == 0) {
            System.out.println("passed all " + count + " tests");
        } else {
            System.out.println("failed " + failCount + " of " + count +
                               " tests");
        }
    }

    public static void test(int n) {
        int[] list = new int[n];
        for (int i = 0; i < n; i++) {
            list[i] = 2 * i;
        }
        System.out.println("testing   " + Arrays.toString(list));
        int[] copy = Arrays.copyOf(list, list.length);
        count++;
        int[] result1 = splitPairs2(list);
        int[] result2 = null;
        RuntimeException except = null;
        boolean fail = false;
        try {
            result2 = splitPairs(list);
        } catch (RuntimeException e) {
            except = e;
            fail = true;
        }
        if (!Arrays.equals(result1, result2) || !Arrays.equals(list, copy)) {
            fail = true;
        }
        if (fail) {
            if (!Arrays.equals(result1, result2)) {
                System.out.println("correct = " + Arrays.toString(result1));
                if (except == null) {
                    System.out.println("yours   = " + Arrays.toString(result2));
                } else {
                    int line = except.getStackTrace()[0].getLineNumber();
                    System.out.println("    threw " + except + " at line #" + line);
                }
            }
            if (!Arrays.equals(list, copy)) {
                System.out.println("they changed the array");
                System.out.println("list    = " + Arrays.toString(list));
            }
            failCount++;
        } else {
            System.out.println("passed");
        }
        System.out.println();
    }
}