Given a list of integers, for each element find the first element to its right that is strictly greater. If no greater element exists to the right, use -1. Return a list of the same size where each position contains the next greater element for that position. Return null for null input and an empty list for empty input.
Examples:
Input: nums = [4, 5, 2, 10]
Output: [5, 10, 10, -1]
Explanation: Next greater for 4 is 5, for 5 is 10, for 2 is 10, for 10 there is none so -1
Input: nums = [3, 2, 1]
Output: [-1, -1, -1]
Explanation: No element has a greater element to its right
Input: nums = [1, 2, 3]
Output: [2, 3, -1]
Explanation: Next greater for 1 is 2, for 2 is 3, for 3 there is none so -1
Input: nums = null
Output: null
Explanation: Null input returns null
Input: nums = []
Output: []
Explanation: Empty list returns empty list
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