Challenge #106: How Long were the Lights On?

[cjmayes]

:)

[alexnajm]

Good challenge!

Spoiler

[ArdianDaka]

my solution

[FrederikE]

Took me forever and I am not entirely sure what I have done in the end, but it works. 

Spoiler

[Bharrison10]

Solution

[DennisK]

That was a tricky one, I think I overcomplicated things ..

[TonyAndriani]

Reposting under my new user ID.

[JamesCharnley]

Spoiler

Could have done a bit more efficiently if I'd gone through the data better to start but it works well

[SasjaB]

My solution

Spoiler

[brianfia]

Spoiler