LeetCode 262: Trips and Users Solution

Master LeetCode problem 262 (Trips and Users), a hard 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.

262. Trips and Users

Hard

Database

Problem Explanation

Explanation

To solve this problem, we need to calculate the cancellation rate of requests with unbanned users each day between specified dates. We will filter out the banned users and their corresponding trips, then calculate the cancellation rate based on the remaining trips.

Join the Trips table with the Users table on client_id and driver_id to filter out banned users.
Count the total number of requests and the number of canceled requests for each day.
Calculate the cancellation rate for each day by dividing the number of canceled requests by the total number of requests.
Round the cancellation rate to two decimal points.

Time Complexity: O(n) Space Complexity: O(n)

Solution Code

# Write your Java solution here
SELECT request_at AS Day,
    ROUND(SUM(CASE WHEN status = 'cancelled_by_client' OR status = 'cancelled_by_driver' THEN 1 ELSE 0 END) / COUNT(*), 2) AS 'Cancellation Rate'
FROM Trips t
JOIN Users u1 ON t.client_id = u1.users_id AND u1.banned = 'No'
JOIN Users u2 ON t.driver_id = u2.users_id AND u2.banned = 'No'
WHERE request_at BETWEEN '2013-10-01' AND '2013-10-03'
GROUP BY request_at;

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