You are given a series of video clips from a sporting event that lasted time seconds. These video clips can be overlapping with each other and have varying lengths.
Each video clip is described by an array clips where clips[i] = [starti, endi] indicates that the ith clip started at starti and ended at endi.
We can cut these clips into segments freely.
\n\n[0, 7] can be cut into segments [0, 1] + [1, 3] + [3, 7].Return the minimum number of clips needed so that we can cut the clips into segments that cover the entire sporting event [0, time]. If the task is impossible, return -1.
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Example 1:
\n\n\nInput: clips = [[0,2],[4,6],[8,10],[1,9],[1,5],[5,9]], time = 10\nOutput: 3\nExplanation: We take the clips [0,2], [8,10], [1,9]; a total of 3 clips.\nThen, we can reconstruct the sporting event as follows:\nWe cut [1,9] into segments [1,2] + [2,8] + [8,9].\nNow we have segments [0,2] + [2,8] + [8,10] which cover the sporting event [0, 10].\n\n\n
Example 2:
\n\n\nInput: clips = [[0,1],[1,2]], time = 5\nOutput: -1\nExplanation: We cannot cover [0,5] with only [0,1] and [1,2].\n\n\n
Example 3:
\n\n\nInput: clips = [[0,1],[6,8],[0,2],[5,6],[0,4],[0,3],[6,7],[1,3],[4,7],[1,4],[2,5],[2,6],[3,4],[4,5],[5,7],[6,9]], time = 9\nOutput: 3\nExplanation: We can take clips [0,4], [4,7], and [6,9].\n\n\n
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Constraints:
\n\n1 <= clips.length <= 1000 <= starti <= endi <= 1001 <= time <= 100你将会获得一系列视频片段，这些片段来自于一项持续时长为 time 秒的体育赛事。这些片段可能有所重叠，也可能长度不一。
使用数组 clips 描述所有的视频片段，其中 clips[i] = [starti, endi] 表示：某个视频片段开始于 starti 并于 endi 结束。
甚至可以对这些片段自由地再剪辑：
\n\n[0, 7] 可以剪切成 [0, 1] + [1, 3] + [3, 7] 三部分。我们需要将这些片段进行再剪辑，并将剪辑后的内容拼接成覆盖整个运动过程的片段（[0, time]）。返回所需片段的最小数目，如果无法完成该任务，则返回 -1 。
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示例 1：
\n\n\n输入：clips = [[0,2],[4,6],[8,10],[1,9],[1,5],[5,9]], time = 10\n输出：3\n解释：\n选中 [0,2], [8,10], [1,9] 这三个片段。\n然后，按下面的方案重制比赛片段：\n将 [1,9] 再剪辑为 [1,2] + [2,8] + [8,9] 。\n现在手上的片段为 [0,2] + [2,8] + [8,10]，而这些覆盖了整场比赛 [0, 10]。\n\n\n
示例 2：
\n\n\n输入：clips = [[0,1],[1,2]], time = 5\n输出：-1\n解释：\n无法只用 [0,1] 和 [1,2] 覆盖 [0,5] 的整个过程。\n\n\n
示例 3：
\n\n\n输入：clips = [[0,1],[6,8],[0,2],[5,6],[0,4],[0,3],[6,7],[1,3],[4,7],[1,4],[2,5],[2,6],[3,4],[4,5],[5,7],[6,9]], time = 9\n输出：3\n解释： \n选取片段 [0,4], [4,7] 和 [6,9] 。\n\n\n
\n\n
提示：
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