1. There are some messages (M1, M2, M3.....M(the last)) left on a answering machine. The number of these messages >= 2. 2. There is a guy who left some messages (N1, N2, N3.....Nx) on the machine. the number of them >=2. 3. If M1 is the same as N1 and M (the last) is the same as N2, who is the guy?
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发表于 2007-3-5 17:05:00
