_1089.java

package com.fishercoder.solutions;

/**
 * 1089. Duplicate Zeros
 *
 * Given a fixed length array arr of integers, duplicate each occurrence of zero, shifting the remaining elements to the right.
 *
 * Note that elements beyond the length of the original array are not written.
 *
 * Do the above modifications to the input array in place, do not return anything from your function.
 *
 * Example 1:
 * Input: [1,0,2,3,0,4,5,0]
 * Output: null
 * Explanation: After calling your function, the input array is modified to: [1,0,0,2,3,0,0,4]
 *
 * Example 2:
 * Input: [1,2,3]
 * Output: null
 * Explanation: After calling your function, the input array is modified to: [1,2,3]
 *
 * Note:
 *
 * 1 <= arr.length <= 10000
 * 0 <= arr[i] <= 9
 * */
public class _1089 {
    public static class Solution1 {
        public void duplicateZeros(int[] arr) {
            for (int i = 0; i < arr.length - 1; i++) {
                if (arr[i] == 0) {
                    duplicateZeros(arr, i + 1);
                    i++;
                }
            }
        }

        private void duplicateZeros(int[] arr, int zeroIndex) {
            int tmp = arr[zeroIndex];
            arr[zeroIndex] = 0;
            for (int i = zeroIndex + 1; i < arr.length; i++) {
                int next = arr[i];
                arr[i] = tmp;
                tmp = next;
            }
        }
    }
}