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Given a list of intervals, remove all intervals that are covered by another interval in the list. Interval [a,b) is covered by interval [c,d) if and only if c <= a and b <= d.
After doing so, 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.
Constraints:
1 <= intervals.length <= 1000
0 <= intervals[i][0] < intervals[i][1] <= 10^5
intervals[i] != intervals[j] for all i != j
给你一个区间列表,请你删除列表中被其他区间所覆盖的区间。
只有当 c <= a 且 b <= d 时,我们才认为区间 [a,b) 被区间 [c,d) 覆盖。
在完成所有删除操作后,请你返回列表中剩余区间的数目。
示例:
输入:intervals = [[1,4],[3,6],[2,8]]
输出:2
解释:区间 [3,6] 被区间 [2,8] 覆盖,所以它被删除了。
提示:
1 <= intervals.length <= 1000
0 <= intervals[i][0] < intervals[i][1] <= 10^5
对于所有的 i != j:intervals[i] != intervals[j]