# 1288. Remove Covered Intervals

https://leetcode.com/problems/remove-covered-intervals

## Description

Given an array `intervals` where `intervals[i] = [li, ri]` represent the interval `[li, ri)`, remove all intervals that are covered by another interval in the list.

The interval `[a, b)` is covered by the interval `[c, d)` if and only if `c <= a` and `b <= d`.

Return _the number of remaining intervals_.

**Example 1:**

```
**Input:** intervals = [[1,4],[3,6],[2,8]]
**Output:** 2
**Explanation:** Interval [3,6] is covered by [2,8], therefore it is removed.
```

**Example 2:**

```
**Input:** intervals = [[1,4],[2,3]]
**Output:** 1
```

**Example 3:**

```
**Input:** intervals = [[0,10],[5,12]]
**Output:** 2
```

**Example 4:**

```
**Input:** intervals = [[3,10],[4,10],[5,11]]
**Output:** 2
```

**Example 5:**

```
**Input:** intervals = [[1,2],[1,4],[3,4]]
**Output:** 1
```

**Constraints:**

* `1 <= intervals.length <= 1000`
* `intervals[i].length == 2`
* `0 <= li <= ri <= 105`
* All the given intervals are **unique**.

## ac

```java
```
