PAT (Advanced Level)1006解

因爲最近在刷題庫，想想就把本人可以想到的解法寫到博客裏，作爲整理歸納。未必是最優解，還請各位高手多多包涵，能夠指點指點。 題目要求 1006 Sign In and Sign Out （25 分） At the beginning of every day, the first person who signs in the computer room will unlock the door,

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