内容 4.3 Variations on a Scheme — Nondeterministic Computing · 351
练习 自检推理
Exercise 4.38: Modify the multiple-dwelling
procedure to omit the requirement that Smith and Fletcher do not live on
adjacent floors. How many solutions are there to this modified puzzle?
练习 4.38：修改多重居住过程，去掉 Smith 和 Fletcher 不住相邻楼层这一要求。修改后的谜题有多少个解？
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