365. Next Greater Element IV

You are given a **0-indexed** array of non-negative integers `nums`. For each integer, you must find its **second greater** integer. The **second greater** integer of `nums[i]` is `nums[j]` such that: - `j > i` - `nums[j] > nums[i]` - There exists **exactly one** index `k` such that `i < k < j` and `nums[k] > nums[i]`. If there is no such `nums[j]`, the second greater integer is considered to be `-1`. Return an integer array `answer`, where `answer[i]` is the second greater integer of `nums[i]`.