[ZigZag] #practice

ZigZag.groovy

class ZigZag {
/*
Example:
Input:  arr[] = {4, 3, 7, 8, 6, 2, 1}
Output: arr[] = {3, 7, 4, 8, 2, 6, 1}

Input:  arr[] =  {1, 4, 3, 2}
Output: arr[] =  {1, 4, 2, 3}
 */
    static void main(String[] args) {
        println zigZag([4, 3, 7, 8, 6, 2, 1] as int[])
        println zigZag([1, 4, 3, 2] as int[])
    }

    static int[] zigZag(int[] arr) {
        boolean direction = true
        int temp
        for (int i = 0; i < arr.length - 1; i++) {
            if (direction) {
                if (arr[i] > arr[i + 1]) {
                    arr = swap(arr, i, i + 1)
                }
            } else {
                if (arr[i] < arr[i + 1]) {
                    arr = swap(arr, i, i + 1)
                }
            }
            direction = !direction
        }
        arr
    }

    static int[] swap(int[] arr, int pos1, int pos2) {
        int temp
        temp = arr[pos1]
        arr[pos1] = arr[pos2]
        arr[pos2] = temp
        arr
    }
}