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: Read a new element from the beginning
list, and push it in the array. - Pop: delete the last element of the array.
- If the target array is already built, stop reading more elements.
Return the operations to build the target array. You are guaranteed 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.
Example 4:
Input: target = [2,3,4], n = 4 Output: ["Push","Pop","Push","Push","Push"]
Constraints:
1 <= target.length <= 1001 <= target[i] <= n1 <= n <= 100targetis strictly increasing.