Password ★ experimental tasks Millet finally came to the school, I am glad that he left him to solve the problem of seniors, has been appreciated by seniors. He played Point luggage went back to the bedroom, only to find the entrance to the dormitory where the door is not actually opened with a key, just wonder millet To wonder, how did not send the key, after millet careful "research", and finally found this to be a lock. This lock is very strange, the password prompt is a string of 1 to n, arranged, he found that this sequence has a rule: If i there, then the subsequent number smaller than i are in descending order. That this was what, millet understood why. Only the door Two buttons and a vertical slot, one PUSH key, another POP key. Fall from the top of each tank system, a digital card Pieces (from 1 to n), PUSH representative to the number in temporary tanks (after first-out), POP out on behalf of a number from the temporary tank As you enter the current password. As show

password.pdf
密码.doc

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