import java.util.Arrays;
import java.util.Random;

public class StepsTest {
    private static final int NUMBER_OF_TESTS = 100;
    private static final int TEST_ARRAY_LENGTH = 50000;

    public static int[] createRandomSortedArray(int size) {
        Random random = new Random();

        int[] array = new int[size];
        for (int i = 0; i < size; i++) {
            array[i] = random.nextInt(NUMBER_OF_TESTS * TEST_ARRAY_LENGTH);
        }

        Arrays.sort(array);

        return array;
    }

    /* pre: array.length >= 1 */
    public static long average(long[] array) {
        long average = array[0];
        for (int i = 1; i < array.length; i++) {
            average = (average * i + array[i]) / (i+1);
        }
        return average;
    }

    public static int hasDuplicate1Steps(int[] array) {
        int steps = 0;
        if (array.length == 1) {
           return steps;
        }
        for (int i = 0; i < array.length; i++) {
            for (int j = 0; j < array.length; j++) {
                steps++;
                if (i != j && array[i] == array[j]) {
                    return steps;
                }
            }
        }
        return steps;
    }

    public static int hasDuplicate2Steps(int[] array) {
        int steps = 0;
        for (int i = 0; i < array.length - 1; i++) {
            steps++;
            if (array[i] == array[i+1]) {
                return steps;
            }
        }
        return steps;
    }
 
    public static void main(String[] args) {
        long[] steps1 = new long[StepsTest.NUMBER_OF_TESTS];
        long[] steps2 = new long[StepsTest.NUMBER_OF_TESTS];

        for (int i = 0; i < StepsTest.NUMBER_OF_TESTS; i++) {
            int[] testArray = createRandomSortedArray(StepsTest.TEST_ARRAY_LENGTH);
            
            /* Test hasDuplicate1 */
            steps1[i] = hasDuplicate1Steps(testArray);

            /* Test hasDuplicate2 */
            steps2[i] = hasDuplicate2Steps(testArray);
        }

        System.out.println("hasDuplicate1 average number of steps is " + average(steps1) + " steps.");
        System.out.println("hasDuplicate2 average number of steps is " + average(steps2) + " steps.");

    }
}