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What should I do about the problem of go-karting in primary school mathematics holiday?
Let each cup go down 1 and up 0, starting from1111,and the target is 22222.

There are three flips: two are 1→ two are 2; Two of them are 2→ two are1; One is 1, one is 2→ one is 2, and the other is 1.

After several or more times, only three changes can occur, all of which are downward, upward twice and upward four times, instead of upward five times.