LeetCode 1661: Average Time of Process per Machine Solution
Master LeetCode problem 1661 (Average Time of Process per Machine), a easy 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.
1661. Average Time of Process per Machine
Problem Explanation
Explanation:
To solve this problem, we need to calculate the average time each machine takes to complete a process. This can be done by grouping the activities by machine_id and process_id, then calculating the processing time for each process and finally finding the average processing time for each machine.
- Group the activities by machine_id and process_id.
- Calculate the processing time for each process by subtracting the 'start' timestamp from the 'end' timestamp.
- Average the processing times for each machine.
Time Complexity: O(n) where n is the number of rows in the Activity table. Space Complexity: O(n) for storing the grouped activities.
:
Solution Code
# Write your Java solution here
SELECT machine_id, ROUND(AVG(end_time - start_time), 3) AS processing_time
FROM (
SELECT machine_id, process_id, MIN(timestamp) AS start_time, MAX(timestamp) AS end_time
FROM Activity
GROUP BY machine_id, process_id
) AS temp
GROUP BY machine_id;Try It Yourself
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What is the time complexity of LeetCode 1661 (Average Time of Process per Machine)?
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