Merge Intervals
Difficulty: Medium
Category: DSA
Topics: Array, Sorting
Asked at: Facebook, JPMorgan, Amazon, Bloomberg, Apple, Google, Microsoft, Adobe, Uber, Twitter, eBay, Paypal, Cisco, Oracle, Yandex, Qualtrics, Palantir Technologies, Yahoo, Walmart Labs, VMware
Given an array of `intervals` where `intervals[i] = [starti, endi]`, merge all overlapping intervals, and return _an array of the non-overlapping intervals that cover all the intervals in the input_.
**Example 1:**
**Input:** intervals = [[1,3],[2,6],[8,10],[15,18]]
**Output:** [[1,6],[8,10],[15,18]]
**Explanation:** Since intervals [1,3] and [2,6] overlap, merge them into [1,6].
```
**Example 2:**
**Input:** intervals = [[1,4],[4,5]]
**Output:** [[1,5]]
**Explanation:** Intervals [1,4] and [4,5] are considered overlapping.
```
**Constraints:**
- `1 <= intervals.length <= 104`
- `intervals[i].length == 2`
- `0 <= starti <= endi <= 104`