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.