2456. Most Popular Video Creator
Description
You are given two string arrays creators
and ids
, and an integer array views
, all of length n
. The ith
video on a platform was created by creators[i]
, has an id of ids[i]
, and has views[i]
views.
The popularity of a creator is the sum of the number of views on all of the creator's videos. Find the creator with the highest popularity and the id of their most viewed video.
- If multiple creators have the highest popularity, find all of them.
- If multiple videos have the highest view count for a creator, find the lexicographically smallest id.
Note: It is possible for different videos to have the same id
, meaning that id
s do not uniquely identify a video. For example, two videos with the same ID are considered as distinct videos with their own viewcount.
Return a 2D array of strings answer
where answer[i] = [creatorsi, idi]
means that creatorsi
has the highest popularity and idi
is the id of their most popular video. The answer can be returned in any order.
Example 1:
Input: creators = ["alice","bob","alice","chris"], ids = ["one","two","three","four"], views = [5,10,5,4]
Output: [["alice","one"],["bob","two"]]
Explanation:
The popularity of alice is 5 + 5 = 10.
The popularity of bob is 10.
The popularity of chris is 4.
alice and bob are the most popular creators.
For bob, the video with the highest view count is "two".
For alice, the videos with the highest view count are "one" and "three". Since "one" is lexicographically smaller than "three", it is included in the answer.
Example 2:
Input: creators = ["alice","alice","alice"], ids = ["a","b","c"], views = [1,2,2]
Output: [["alice","b"]]
Explanation:
The videos with id "b" and "c" have the highest view count.
Since "b" is lexicographically smaller than "c", it is included in the answer.
Constraints:
n == creators.length == ids.length == views.length
1 <= n <= 105
1 <= creators[i].length, ids[i].length <= 5
creators[i]
andids[i]
consist only of lowercase English letters.0 <= views[i] <= 105
Solutions
Solution 1: Hash Table
We traverse the three arrays, use a hash table $cnt$ to count the total play count for each creator, and use a hash table $d$ to record the index of the video with the highest play count for each creator.
Then, we traverse the hash table $cnt$ to find the maximum play count $mx$; then we traverse the hash table $cnt$ again to find the creators with a play count of $mx$, and add them to the answer array.
The time complexity is $O(n)$, and the space complexity is $O(n)$. Here, $n$ is the number of videos.
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