EPISODE · Apr 17, 2018 · 2 MIN
两位象棋大师在下棋
from 英语小小孩 · host 英语小小孩
两位象棋大师在下棋，下了5盘棋后，统计发现两位大师各自赢棋的盘数相等！这是怎么回事？语音里公布了答案，如果你没有听懂，就发信息给我，我解释中文给你听。上次的信使难题，他们的解决方法类似密码学中的一种算法。送信人a在盒子上锁上一把锁x。收信人b在收到盒子后没有锁x的钥匙，b就再锁上自己的一把锁y，然后把盒子寄回给a。a收到盒子后打开锁x，再把盒子寄给b。这时的盒子上还剩一把锁y。b收到盒子后再把锁y打开就能打开这个盒子了。
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两位象棋大师在下棋
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