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Hey! Wanted to share a beautiful combinatorics problem — the best short-answer problem I've seen recently. Try it when you have 15 minutes to spare since your submission will be timed :)
Beautiful Combinatorics Problem
Hope you all enjoy! There is a solution on the 'post-contest' screen.
Hmmm, not suspicious at all...
I added it onto the site as a contest because of how beautiful it was haha
348D - Turtles
More generally, see the LGV Lemma
Yep, it's very nice
It is pretty cool. It reminds me of another one I saw that went like this:
You are an archer and you have to pop three columns of balloons. One column contains $$$2$$$ balloons and the other two columns contain $$$3$$$ balloons. You can pop a balloon from any column, but unfortunately, you can only pop the bottommost balloon in some column. In how many different ways can you pop all the balloons?
mine is this