leetcode-problemset/leetcode/originData/average-time-of-process-per-machine.json

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            "title": "Average Time of Process per Machine",
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            "content": "<p>Table: <code>Activity</code></p>\n\n<pre>\n+----------------+---------+\n| Column Name    | Type    |\n+----------------+---------+\n| machine_id     | int     |\n| process_id     | int     |\n| activity_type  | enum    |\n| timestamp      | float   |\n+----------------+---------+\nThe table shows the user activities for a factory website.\n(machine_id, process_id, activity_type) is the primary key (combination of columns with unique values) of this table.\nmachine_id is the ID of a machine.\nprocess_id is the ID of a process running on the machine with ID machine_id.\nactivity_type is an ENUM (category) of type (&#39;start&#39;, &#39;end&#39;).\ntimestamp is a float representing the current time in seconds.\n&#39;start&#39; means the machine starts the process at the given timestamp and &#39;end&#39; means the machine ends the process at the given timestamp.\nThe &#39;start&#39; timestamp will always be before the &#39;end&#39; timestamp for every (machine_id, process_id) pair.</pre>\n\n<p>&nbsp;</p>\n\n<p>There is a factory website that has several machines each running the <strong>same number of processes</strong>. Write a solution&nbsp;to find the <strong>average time</strong> each machine takes to complete a process.</p>\n\n<p>The time to complete a process is the <code>&#39;end&#39; timestamp</code> minus the <code>&#39;start&#39; timestamp</code>. The average time is calculated by the total time to complete every process on the machine divided by the number of processes that were run.</p>\n\n<p>The resulting table should have the <code>machine_id</code> along with the <strong>average time</strong> as <code>processing_time</code>, which should be <strong>rounded to 3 decimal places</strong>.</p>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The result format is in the following example.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nActivity table:\n+------------+------------+---------------+-----------+\n| machine_id | process_id | activity_type | timestamp |\n+------------+------------+---------------+-----------+\n| 0          | 0          | start         | 0.712     |\n| 0          | 0          | end           | 1.520     |\n| 0          | 1          | start         | 3.140     |\n| 0          | 1          | end           | 4.120     |\n| 1          | 0          | start         | 0.550     |\n| 1          | 0          | end           | 1.550     |\n| 1          | 1          | start         | 0.430     |\n| 1          | 1          | end           | 1.420     |\n| 2          | 0          | start         | 4.100     |\n| 2          | 0          | end           | 4.512     |\n| 2          | 1          | start         | 2.500     |\n| 2          | 1          | end           | 5.000     |\n+------------+------------+---------------+-----------+\n<strong>Output:</strong> \n+------------+-----------------+\n| machine_id | processing_time |\n+------------+-----------------+\n| 0          | 0.894           |\n| 1          | 0.995           |\n| 2          | 1.456           |\n+------------+-----------------+\n<strong>Explanation:</strong> \nThere are 3 machines running 2 processes each.\nMachine 0&#39;s average time is ((1.520 - 0.712) + (4.120 - 3.140)) / 2 = 0.894\nMachine 1&#39;s average time is ((1.550 - 0.550) + (1.420 - 0.430)) / 2 = 0.995\nMachine 2&#39;s average time is ((4.512 - 4.100) + (5.000 - 2.500)) / 2 = 1.456\n</pre>\n",
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                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('0', '0', 'end', '1.52')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('0', '1', 'start', '3.14')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('0', '1', 'end', '4.12')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('1', '0', 'start', '0.55')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('1', '0', 'end', '1.55')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('1', '1', 'start', '0.43')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('1', '1', 'end', '1.42')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('2', '0', 'start', '4.1')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('2', '0', 'end', '4.512')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('2', '1', 'start', '2.5')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('2', '1', 'end', '5')"
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