Another random problem I just had (that I gave up for not being important whatsoever, not knowing the required material, and knowing that I would be nerd sniped if I did it):
In minecraft, sugarcane grows at a somewhat weird rate. Every tick, a block of sugarcane has a chance to try to grow. This chance is determined by taking all of the blocks in a 16x16x16 area and choosing three of those blocks. If a sugarcane happens to be chosen, it increases its age by one. When the age hits 16, it grows one block.
If you don't know anything about minecraft, when you get a new block of sugarcane, you can harvest it without affecting the old one, and can either save it or plant it again. So, assume that you harvest the new sugarcane instantly, and at first, you replant it, but later, you save it. Also assume that you won't use sugarcane you planted already. Say you want to save 138 sugarcane1. What is the optimal point to switch from replanting sugarcane to saving it?
I know this question might seem complicated just because of the way I worded it, but in the end, it should make sense. I just realized that the solution gets really complicated.
1: Although it's not important for this problem, this is the amount needed to make an enchantment table and 15 bookshelves