[최원준] 2026/10/17

leetcode3/최원준/1311. Get Watched Videos by Your Friends.py

@@ -0,0 +1,30 @@
+
+from collections import deque, Counter
+
+class Solution:
+    def watchedVideosByFriends(
+        self,
+        watchedVideos: list[list[str]],
+        friends: list[list[int]],
+        id: int,
+        level: int
+    ) -> list[str]:
+
+        queue = deque([id])
+        visited = {id}
+
+        for _ in range(level):
+            for _ in range(len(queue)):
+                person = queue.popleft()
+
+                for friend in friends[person]:
+                    if friend not in visited:
+                        visited.add(friend)
+                        queue.append(friend)
+
+        count = Counter()
+
+        for person in queue:
+            count.update(watchedVideos[person])
+
+        return sorted(count, key=lambda video: (count[video], video))