LeetCode 534: Game Play Analysis III Solution
Master LeetCode problem 534 (Game Play Analysis III), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
534. Game Play Analysis III
Problem Explanation
Explanation
To solve this problem, we need to find the number of players who played at least three consecutive rounds and their player ID. We can iterate through the Activity table ordered by player_id and event_date, and use a window function to count the consecutive rounds played by each player. Then, we can filter out the players who played at least three consecutive rounds.
Algorithm:
- Use a window function to calculate the row number partitioned by
player_idand ordered byevent_date. - Use a subquery to filter out the players who played at least three consecutive rounds.
- Select the distinct
player_idfrom the subquery.
Time Complexity: O(n), where n is the number of records in the Activity table.
Space Complexity: O(1)
Solution Code
# Write your Java solution here
SELECT DISTINCT player_id
FROM (
SELECT player_id, event_date,
ROW_NUMBER() OVER (PARTITION BY player_id ORDER BY event_date) as row_num
FROM Activity
) AS temp
WHERE temp.row_num >= 3Try It Yourself
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