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# Weekly Challenges

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## Challenge #106: How Long were the Lights On?

Alteryx Alumni (Retired)

Last week's solution can be found here:

This week, we have a simple data set that represents times that inhabitants enter and exit rooms within their household. Assuming inhabitants have the lights of the room on whenever they are present and off when they are not (think motion detection), how many minutes were lights on in each of the rooms?

Note: If there are overlapping time entries, assume the light is on as long as someone is present in the room.
Example: Person 1 is in the room from 12:30 PM - 1:30 PM, and person 2 is in the same room from 1:00 PM to 2:00 PM. The amount of time the light was on was from 12:30 PM to 2:00 PM (do not count duplicate time).

14 - Magnetar

Spoiler

Trickier than I thought until I realised that DateTimes would be easier to work with than Times. Managed to solve this with two tools in the end:

ACE Emeritus

Two-tool solution! :)

Spoiler

Cheers,

NJ

9 - Comet

Here is my totally overcomplicated solution, just because

Spoiler
I didn't want to use Generate Row tool, thinking that on a real size data generating every minute would create a massive dataset, also it seems like a direct solution and I was interested to find if there is another way. And of course it is with Alteryx!

Could also do it in two tools but then my already hard-to read formula in multi-row tool would be even worse, so I decided to leave 3 tools.

8 - Asteroid

Here's my pass at it!

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No Generate Rows or complex Multi-Row formula when I was trying, but its neat to see all the ways other people trimmed the fat in their solutions!

17 - Castor

I guess it's one of those times where the straight forward solution wasn't coming to mind...

Spoiler
ACE Emeritus

Got there eventually

Spoiler
14 - Magnetar

Solution attached.

Spoiler
I'm not sure if my method is the most optimal or not - basically I created a distinct record for each minute that existed and then used a pair of summarize tools.  You could also use a count_distinct and cut the second summarize.
8 - Asteroid

This was harder than I expected.

Spoiler

8 - Asteroid

Hello,

Challenge #106 resolved.

Please find my workflow-solution attached.