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this can be solved in O(nlogn) with greedy algo. Sort all the end points, then iterate through all the end points using a simple array of size 2 to keep track of the intervals that are still open(haven't met their closing point yet). Whenever the opening intervals reached 3, just remove the interval that spans the furtherst.
Interval Selection
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this can be solved in O(nlogn) with greedy algo. Sort all the end points, then iterate through all the end points using a simple array of size 2 to keep track of the intervals that are still open(haven't met their closing point yet). Whenever the opening intervals reached 3, just remove the interval that spans the furtherst.