public class Solution
extends Object
1441 - Build an Array With Stack Operations\.
Easy
You are given an array `target` and an integer `n`.
In each iteration, you will read a number from `list = [1, 2, 3, ..., n]`.
Build the `target` array using the following operations:
* `"Push"`: Reads a new element from the beginning list, and pushes it in the array.
* `"Pop"`: Deletes the last element of the array.
* If the target array is already built, stop reading more elements.
Return _a list of the operations needed to build_ `target`. The test cases are generated so that the answer is **unique**.
**Example 1:**
**Input:** target = [1,3], n = 3
**Output:** ["Push","Push","Pop","Push"]
**Explanation:**
Read number 1 and automatically push in the array -> [1]
Read number 2 and automatically push in the array then Pop it -> [1]
Read number 3 and automatically push in the array -> [1,3]
**Example 2:**
**Input:** target = [1,2,3], n = 3
**Output:** ["Push","Push","Push"]
**Example 3:**
**Input:** target = [1,2], n = 4
**Output:** ["Push","Push"]
**Explanation:** You only need to read the first 2 numbers and stop.
**Constraints:**
* `1 <= target.length <= 100`
* `1 <= n <= 100`
* `1 <= target[i] <= n`
* `target` is strictly increasing.