Given an integer array `nums` and an integer `k`, return the `k`th largest element in the array.
Note that it is the `k`th largest element in the sorted order, not the `k`th distinct element.
Can you solve it without sorting?
**Example 1:**
```
Input: nums = [3,2,1,5,6,4], k = 2
Output: 5
```
**Example 2:**
```
Input: nums = [3,2,3,1,2,4,5,5,6], k = 4
Output: 4
```