"""

1024.
Medium

You are given a series of video clips from a sporting event that lasted T seconds.
These video clips can be overlapping with each other and have varied lengths.

Each video clip clips[i] is an interval: it starts at time clips[i][0] and ends at time clips[i][1].
We can cut these clips into segments freely: for example, a clip [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, T]).  If the task is impossible, return -1.



Example 1:

Input: clips = [[0,2],[4,6],[8,10],[1,9],[1,5],[5,9]], T = 10
Output: 3
Explanation:
We take the clips [0,2], [8,10], [1,9]; a total of 3 clips.
Then, we can reconstruct the sporting event as follows:
We cut [1,9] into segments [1,2] + [2,8] + [8,9].
Now we have segments [0,2] + [2,8] + [8,10] which cover the sporting event [0, 10].
Example 2:

Input: clips = [[0,1],[1,2]], T = 5
Output: -1
Explanation:
We can't cover [0,5] with only [0,1] and [0,2].
Example 3:

Input: 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]], T = 9
Output: 3
Explanation:
We can take clips [0,4], [4,7], and [6,9].
Example 4:

Input: clips = [[0,4],[2,8]], T = 5
Output: 2
Explanation:
Notice you can have extra video after the event ends.


"""

from typing import List
from functools import cmp_to_key


class Solution:
    def videoStitching(self, clips: List[List[int]], T: int) -> int:
        clips = sorted(clips, key=cmp_to_key(self.compare))
        print(clips)
        return clips

    def compare(self, i1, i2):
        if i1[0] < i2[0]:
            return -1
        elif i1[0] > i2[0]:
            return 1
        else:
            if i1[1] < i2[1]:
                return 1
            elif i1[1] > i2[1]:
                return -1
        return 0


if __name__ == '__main__':
    sol = Solution()
    method = sol.videoStitching

    cases = [
        (method, ([[0,2],[4,6],[8,10],[1,9],[1,5],[5,9]], 10), 4),
    ]

    for i, (func, case, expected) in enumerate(cases):
        ans = func(*case)
        if ans == expected:
            print("Case {:d} Passed".format(i + 1))
        else:
            print("Case {:d} Failed; Expected {:s} != {:s}".format(i + 1, str(expected), str(ans)))