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g0901_1000.s0986_interval_list_intersections.readme.md Maven / Gradle / Ivy

986\. Interval List Intersections

Medium

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_.

A **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]`.

**Example 1:**

![](https://assets.leetcode.com/uploads/2019/01/30/interval1.png)

**Input:** firstList = [[0,2],[5,10],[13,23],[24,25]], secondList = [[1,5],[8,12],[15,24],[25,26]]

**Output:** [[1,2],[5,5],[8,10],[15,23],[24,24],[25,25]]

**Example 2:**

**Input:** firstList = [[1,3],[5,9]], secondList = []

**Output:** []

**Constraints:**

*   `0 <= firstList.length, secondList.length <= 1000`
*   `firstList.length + secondList.length >= 1`
*   0 <= starti < endi <= 109
*   endi < starti+1
*   0 <= startj < endj <= 109
*   endj < startj+1