You are given two lists of closed intervals, firstList and secondList, where firstList[i] = [starti, endi] and secondList[j] = [startj, endj]. Each list of intervals is pairwise disjoint and in sorted order.
Return the intersection of these two interval lists.
\n\nA closed interval [a, b] (with a <= b) denotes the set of real numbers x with a <= x <= b.
The intersection of two closed intervals is a set of real numbers that are either empty or represented as a closed interval. For example, the intersection of [1, 3] and [2, 4] is [2, 3].
\n
Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2019/01/30/interval1.png\")
\n\nInput: firstList = [[0,2],[5,10],[13,23],[24,25]], secondList = [[1,5],[8,12],[15,24],[25,26]]\nOutput: [[1,2],[5,5],[8,10],[15,23],[24,24],[25,25]]\n\n\n
Example 2:
\n\n\nInput: firstList = [[1,3],[5,9]], secondList = []\nOutput: []\n\n\n
\n
Constraints:
\n\n0 <= firstList.length, secondList.length <= 1000firstList.length + secondList.length >= 10 <= starti < endi <= 109endi < starti+10 <= startj < endj <= 109 endj < startj+1给定两个由一些 闭区间 组成的列表，firstList 和 secondList ，其中 firstList[i] = [starti, endi] 而 secondList[j] = [startj, endj] 。每个区间列表都是成对 不相交 的，并且 已经排序 。
返回这 两个区间列表的交集 。
\n\n形式上，闭区间 [a, b]（其中 a <= b）表示实数 x 的集合，而 a <= x <= b 。
两个闭区间的 交集 是一组实数，要么为空集，要么为闭区间。例如，[1, 3] 和 [2, 4] 的交集为 [2, 3] 。
\n\n
示例 1：
\n\n\n输入：firstList = [[0,2],[5,10],[13,23],[24,25]], secondList = [[1,5],[8,12],[15,24],[25,26]]\n输出：[[1,2],[5,5],[8,10],[15,23],[24,24],[25,25]]\n\n\n
示例 2：
\n\n\n输入：firstList = [[1,3],[5,9]], secondList = []\n输出：[]\n\n\n
示例 3：
\n\n\n输入：firstList = [], secondList = [[4,8],[10,12]]\n输出：[]\n\n\n
示例 4：
\n\n\n输入：firstList = [[1,7]], secondList = [[3,10]]\n输出：[[3,7]]\n\n\n
\n\n
提示：
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