ranges[i] has exactly 2 cells:

These ranges cover some cells of nums and leave some cells uncovered. Your task is to find all of the uncovered ranges with maximal length.

Return a 2D-arrayanswer of the uncovered ranges,sorted by the starting point in ascending order.

By all of the uncovered ranges with maximal length, we mean satisfying two conditions:

Each uncovered cell should belong to exactly one sub-range
There should not exist two ranges (l1, r1) and (l2, r2) such that r1 + 1 = l2

Example 1:

Input: n = 10, ranges = [[3,5],[7,8]]
Output: [[0,2