For example, there is something wrong with my Crimaster. There are six interconnected rooms in her house. In fact, we can't just focus on the overall situation, we must integrate all available information.

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For example, my sister has a problem. There are six interconnected rooms in her house, five of which have large pieces of furniture (pictured), and the empty room connecting the doors is the living room. As parents like reading, they decided to replace the bookshelf and piano. However, because each piece of furniture takes up a lot of space and can't be put in the same room, only one piece of furniture can be moved to an empty room at a time, and at the same time, an empty room can be vacated for the next move. The ideal ending is that the piano and bookcase have changed rooms and the living room is still empty. It doesn't matter where the remaining three pieces of furniture are put (they can be in the original room or not). So, how many times do you have to move at least to achieve the desired effect?

Answer analysis

Correct answer: 16-20 times.

It takes 18 times to complete. The order of action is: piano-

Bookshelves-→ potted plants-

Piano-→ wardrobe → cupboard-→ piano-→ potted plant-→ bookshelf-→ wardrobe → potted plant-→ piano-→ cupboard → potted plant wardrobe → bookshelf piano-wardrobe, in which the first step 17 completed the exchange of bookshelf and piano, and the last step was to make the living room an empty room again.

The information in the whole empty room must be carefully calculated before all the mysteries can be fully unfolded. It is more convenient to solve this problem in this way, and if we concentrate the information too much, problems will easily occur.