Merge Intervals
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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:
Input: intervals = [[1,3],[2,6],[8,10],[15,18]]
Output: [[1,6],[8,10],[15,18]]
Examples
Input → [[1,3],[2,6],[8,10],[15,18]]
Output → [[1,6],[8,10],[15,18]]
Input → [[1,4],[4,5]]
Output → [[1,5]]