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VideoStitching.java
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VideoStitching.java
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package Leetcode;
import java.util.Arrays;
/**
* @author kalpak
*
* 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 [1,2].
*
* 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.
*
*
* Constraints:
*
* 1 <= clips.length <= 100
* 0 <= clips[i][0] <= clips[i][1] <= 100
* 0 <= T <= 100
*
*/
public class VideoStitching {
public static int videoStitching(int[][] clips, int T) {
int result = 0;
if(clips.length == 0 || clips == null)
return 0;
Arrays.sort(clips, (a, b) -> a[0] - b[0]);
int currentClip = 0;
int currentEnd = 0;
while(currentEnd < T) {
int runningEnd = 0;
while(currentClip < clips.length && clips[currentClip][0] <= currentEnd) {
runningEnd = Math.max(runningEnd, clips[currentClip][1]);
currentClip++;
}
result++;
if(runningEnd <= currentEnd)
return -1;
currentEnd = runningEnd;
}
return result;
}
public static void main(String[] args) {
int[][] clips = new int[][]{{0,2},{4,6},{8,10},{1,9},{1,5},{5,9}};
System.out.println("The number of clips needed are : " + videoStitching(clips, 10));
}
}