Package g1301_1400.s1311_get_watched_videos_by_your_friends

Class Solution

java.lang.Object
g1301_1400.s1311_get_watched_videos_by_your_friends.Solution
public class Solution extends java.lang.Object
1311 - Get Watched Videos by Your Friends.

Medium

There are n people, each person has a unique id between 0 and n-1. Given the arrays watchedVideos and friends, where watchedVideos[i] and friends[i] contain the list of watched videos and the list of friends respectively for the person with id = i.

Level 1 of videos are all watched videos by your friends, level 2 of videos are all watched videos by the friends of your friends and so on. In general, the level k of videos are all watched videos by people with the shortest path exactly equal to k with you. Given your id and the level of videos, return the list of videos ordered by their frequencies (increasing). For videos with the same frequency order them alphabetically from least to greatest.

Example 1:

Input: watchedVideos = [[“A”,“B”],[“C”],[“B”,“C”],[“D”]], friends = [[1,2],[0,3],[0,3],[1,2]], id = 0, level = 1

Output: [“B”,“C”]

Explanation:

You have id = 0 (green color in the figure) and your friends are (yellow color in the figure):

Person with id = 1 -> watchedVideos = [“C”]

Person with id = 2 -> watchedVideos = [“B”,“C”]

The frequencies of watchedVideos by your friends are:

B -> 1

C -> 2

Example 2:

Input: watchedVideos = [[“A”,“B”],[“C”],[“B”,“C”],[“D”]], friends = [[1,2],[0,3],[0,3],[1,2]], id = 0, level = 2

Output: [“D”]

Explanation: You have id = 0 (green color in the figure) and the only friend of your friends is the person with id = 3 (yellow color in the figure).

Constraints:

  • n == watchedVideos.length == friends.length
  • 2 <= n <= 100
  • 1 <= watchedVideos[i].length <= 100
  • 1 <= watchedVideos[i][j].length <= 8
  • 0 <= friends[i].length < n
  • 0 <= friends[i][j] < n
  • 0 <= id < n
  • 1 <= level < n
  • if friends[i] contains j, then friends[j] contains i

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    java.util.List<java.lang.String>
    watchedVideosByFriends(java.util.List<java.util.List<java.lang.String>> watchedVideos, int[][] friends, int id, int level)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • watchedVideosByFriends

      public java.util.List<java.lang.String> watchedVideosByFriends(java.util.List<java.util.List<java.lang.String>> watchedVideos, int[][] friends, int id, int level)