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1089. Duplicate Zeros

题目

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. 1 <= arr.length <= 10000
2. 0 <= arr[i] <= 9

题目大意

给你一个长度固定的整数数组 arr，请你将该数组中出现的每个零都复写一遍，并将其余的元素向右平移。注意：请不要在超过该数组长度的位置写入元素。要求：请对输入的数组 就地 进行上述修改，不要从函数返回任何东西。

解题思路

• 给一个固定长度的数组，把数组元素为 0 的元素都往后复制一遍，后面的元素往后移，超出数组长度的部分删除。
• 简单题，按照题意，用 append 和 slice 操作即可。

代码

func duplicateZeros(arr []int) {
	for i := 0; i < len(arr); i++ {
		if arr[i] == 0 && i+1 < len(arr) {
			arr = append(arr[:i+1], arr[i:len(arr)-1]...)
			i++
		}
	}
}