1024. 视频拼接

Author: chenpengcode

dp/1024_videoStitching.py

@@ -0,0 +1,36 @@
+from typing import List
+
+
+class Solution:
+    def videoStitching(self, clips: List[List[int]], T: int) -> int:
+        dp = [0] + [float("inf")] * T
+        for i in range(1, T + 1):
+            for aj, bj in clips:
+                if aj < i <= bj:
+                    dp[i] = min(dp[i], dp[aj] + 1)
+
+        return -1 if dp[T] == float("inf") else dp[T]
+
+    def videoStitching_greed(self, clips: List[List[int]], T: int) -> int:
+        maxn = [0] * T
+        last = ret = pre = 0
+        for a, b in clips:
+            if a < T:
+                maxn[a] = max(maxn[a], b)
+
+        for i in range(T):
+            last = max(last, maxn[i])
+            if i == last:
+                return -1
+            if i == pre:
+                ret += 1
+                pre = last
+
+        return ret
+
+
+if __name__ == '__main__':
+    clips = [[0, 2], [4, 6], [8, 10], [1, 9], [1, 5], [5, 9]]
+    T = 10
+    solution = Solution()
+    print(solution.videoStitching_greed(clips, T))