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by Chris Burke
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937: Twelve Days of Christmas (Reprise)

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Mr. Michael Keegan, Math Teacher

Expressing my True Love mathematically and recursively.

This comic calls to mind my Twelve Triangle Numbers of Christmas from way back in 2007.

Once again, I used pseudo-code here, and not any particular programming language. I wouldn't program it exactly like this, but I wanted it to be readable.

As for the summations, those actually caused me some problems -- or at least a bit of thought about how they work, which is something I'll have to refresh my memory on. However, the one thing that occured to me is that I wanted the gifts in order, not just an actual sum of the number of gifts, and I wanted it to match the code. That meant that I had to count backward (or count down). Unfortunately, summations (to my knowledge at this point) count up. That meant minus signs and +1s, which I eliminated by starting j at 0 instead of 1.

More on this tomorrow, probably.


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