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This was my original solution but then refactored before submitting to a single pass solution.
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Still O(n)
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code wars is ruined by the 13 to 20 demographic
The feeling I had wracking my brain to solve this only to find the top solution was near exactly what I had come up with :')
I like the logic behind your solution. Very similar to mine
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oh my good 'o'
wow that's really clever! and so much less code than what I had!
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Yes, So I tried a loop within a loop and jumped n windows each run in inside loop, n being the student number. I think i screwed up while doing a close/open of the door.
Try it with a few small numbers on paper, and hopefully, you'll spot the pattern.
How do you optimise it ?
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